PowerPoint (PPT & PPTX) files are rich with diverse content, including text, images, tables, charts, shapes, and metadata. Extracting these elements programmatically can unlock a wide range of use cases, from automating repetitive tasks to performing in-depth data analysis or migrating content across platforms.

In this tutorial, we'll explore how to read PowerPoint documents in Python using Spire.Presentation for Python, a powerful library for processing PowerPoint files.

Table of Contents:

• Python Library to Read PowerPoint Files
• Extracting Text from Slides
  • Extract Text from Shapes
  • Extract Text from Tables
  • Extract Text from SmartArt
• Saving Images from Slides
• Accessing Metadata (Document Properties)
• Conclusion
• FAQs

1. Python Library to Read PowerPoint Files

To work with PowerPoint files in Python, we'll use Spire.Presentation for Python. This feature-rich library enables developers to create, edit, and read content from PowerPoint presentations efficiently. It allows for the extraction of text, images, tables, SmartArt, and metadata with minimal coding effort.

Before we begin, install the library using pip:

pip install spire.presentation

Now, let's dive into different ways to extract content from PowerPoint files.

2. Extracting Text from Slides in Python

PowerPoint slides contain text in various forms—shapes, tables, SmartArt, and more. We'll explore how to extract text from each of these elements.

2.1 Extract Text from Shapes

Most text in PowerPoint slides resides within shapes (text boxes, labels, etc.). Here’s how to extract text from shapes:

Steps-by-Step Guide

• Initialize the Presentation object and load your PowerPoint file.
• Iterate through each slide and its shapes.
• Check if a shape is an IAutoShape (a standard text container).
• Extract text from each paragraph in the shape.

Code Example

from spire.presentation import *
from spire.presentation.common import *

# Create an object of Presentation class
presentation = Presentation()

# Load a PowerPoint presentation
presentation.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Input.pptx")

# Create a list
text = []

# Loop through the slides in the document
for slide_index, slide in enumerate(presentation.Slides):
    # Add slide marker
    text.append(f"====slide {slide_index + 1}====")

    # Loop through the shapes in the slide
    for shape in slide.Shapes:
        # Check if the shape is an IAutoShape object
        if isinstance(shape, IAutoShape):
            # Loop through the paragraphs in the shape
            for paragraph in shape.TextFrame.Paragraphs:
                # Get the paragraph text and append it to the list
                text.append(paragraph.Text)

# Write the text to a txt file
with open("output/ExtractAllText.txt", "w", encoding='utf-8') as f:
    for s in text:
        f.write(s + "\n")

# Dispose resources
presentation.Dispose()

Output:

2.2 Extract Text from Tables

Tables in PowerPoint store structured data. Extracting this data requires iterating through each cell to maintain the table’s structure.

Step-by-Step Guide

• Initialize the Presentation object and load your PowerPoint file.
• Iterate through each slide to access its shapes.
• Identify table shapes (ITable objects).
• Loop through rows and cells to extract text.

Code Example

from spire.presentation import *
from spire.presentation.common import *

# Create a Presentation object
presentation = Presentation()

# Load a PowerPoint file
presentation.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Input.pptx")

# Create a list for tables
tables = []

# Loop through the slides
for slide in presentation.Slides:
    # Loop through the shapes in the slide
    for shape in slide.Shapes:
        # Check whether the shape is a table
        if isinstance(shape, ITable):
            tableData = ""

            # Loop through the rows in the table
            for row in shape.TableRows:
                rowData = ""

                # Loop through the cells in the row
                for i in range(row.Count):
                    # Get the cell value
                    cellValue = row[i].TextFrame.Text
                    # Add cell value with spaces for better readability
                    rowData += (cellValue + "  |  " if i < row.Count - 1 else cellValue)
                tableData += (rowData + "\n")
            tables.append(tableData)

# Write the tables to text files
for idx, table in enumerate(tables, start=1):
    fileName = f"output/Table-{idx}.txt"
    with open(fileName, "w", encoding='utf-8') as f:
        f.write(table)

# Dispose resources
presentation.Dispose()

Output:

2.3 Extract Text from SmartArt

SmartArt is a unique feature in PowerPoint used for creating diagrams. Extracting text from SmartArt involves accessing its nodes and retrieving the text from each node.

Step-by-Step Guide

• Load the PowerPoint file into a Presentation object.
• Iterate through each slide and its shapes.
• Identify ISmartArt shapes in slides.
• Loop through each node in the SmartArt.
• Extract and save the text from each node.

Code Example

from spire.presentation.common import *
from spire.presentation import *

# Create a Presentation object
presentation = Presentation()

# Load a PowerPoint file
presentation.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Input.pptx")

# Iterate through each slide in the presentation
for slide_index, slide in enumerate(presentation.Slides):

    # Create a list to store the extracted text for the current slide
    extracted_text = []

    # Loop through the shapes on the slide and find the SmartArt shapes
    for shape in slide.Shapes:
        if isinstance(shape, ISmartArt):
            smartArt = shape
            
            # Extract text from the SmartArt nodes and append to the list
            for node in smartArt.Nodes:
                extracted_text.append(node.TextFrame.Text)

    # Write the extracted text to a separate text file for each slide
    if extracted_text:  # Only create a file if there's text extracted
        file_name = f"output/SmartArt-from-slide-{slide_index + 1}.txt"
        with open(file_name, "w", encoding="utf-8") as text_file:
            for text in extracted_text:
                text_file.write(text + "\n")

# Dispose resources
presentation.Dispose()

Output:

You might also be interested in: Read Speaker Notes in PowerPoint in Python

3. Saving Images from Slides in Python

In addition to text, slides often contain images that may be important for your analysis. This section will show you how to save images from the slides.

Step-by-Step Guide

• Initialize the Presentation object and load your PowerPoint file.
• Access the Images collection in the presentation.
• Iterate through each image and save it in a desired format (e.g., PNG).

Code Example

from spire.presentation.common import *
from spire.presentation import *

# Create a Presentation object
presentation = Presentation()

# Load a PowerPoint document
presentation.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Input.pptx")

# Get the images in the document
images = presentation.Images

# Iterate through the images in the document
for i, image in enumerate(images):

    # Save a certain image in the specified path
    ImageName = "Output/Images_"+str(i)+".png"
    image.Image.Save(ImageName)

# Dispose resources
presentation.Dispose()

Output:

4. Accessing Metadata (Document Properties) in Python

Extracting metadata provides insights into the presentation, such as its title, author, and keywords. This section will guide you on how to access and save this metadata.

Step-by-Step Guide

• Create and load your PowerPoint file into a Presentation object.
• Access the DocumentProperty object.
• Extract properties like Title , Author , and Keywords .

Code Example

from spire.presentation.common import *
from spire.presentation import *

# Create a Presentation object
presentation = Presentation()

# Load a PowerPoint document
presentation.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Input.pptx")

# Get the DocumentProperty object
documentProperty = presentation.DocumentProperty

# Prepare the content for the text file
properties = [
    f"Title: {documentProperty.Title}",
    f"Subject: {documentProperty.Subject}",
    f"Author: {documentProperty.Author}",
    f"Manager: {documentProperty.Manager}",
    f"Company: {documentProperty.Company}",
    f"Category: {documentProperty.Category}",
    f"Keywords: {documentProperty.Keywords}",
    f"Comments: {documentProperty.Comments}",
]

# Write the properties to a text file
with open("output/DocumentProperties.txt", "w", encoding="utf-8") as text_file:
    for line in properties:
        text_file.write(line + "\n")

# Dispose resources
presentation.Dispose()

Output:

You might also be interested in: Add Document Properties to a PowerPoint File in Python

5. Conclusion

With Spire.Presentation for Python, you can effortlessly read and extract various elements from PowerPoint files—such as text, images, tables, and metadata. This powerful library streamlines automation tasks, content analysis, and data migration, allowing for efficient management of PowerPoint files. Whether you're developing an analytics tool, automating document processing, or managing presentation content, Spire.Presentation offers a robust and seamless solution for programmatically handling PowerPoint files.

6. FAQs

Q1. Can Spire.Presentation handle password-protected PowerPoint files?

Yes, Spire.Presentation can open and process password-protected PowerPoint files. To access an encrypted file, use the LoadFromFile() method with the password parameter:

presentation.LoadFromFile("encrypted.pptx", "yourpassword")

Q2. How can I read comments from PowerPoint slides?

You can read comments from PowerPoint slides using the Spire.Presentation library. Here’s how:

from spire.presentation import Presentation

presentation = Presentation()
presentation.LoadFromFile("Input.pptx")

with open("PowerPoint_Comments.txt", "w", encoding="utf-8") as file:
    for slide_idx, slide in enumerate(presentation.Slides):
        if len(slide.Comments) > 0:
            for comment_idx, comment in enumerate(slide.Comments):
                file.write(f"Comment {comment_idx + 1} from Slide {slide_idx + 1}: {comment.Text}\n")

Q3. Does Spire.Presentation preserve formatting when extracting text?

Basic text extraction retrieves raw text content. For formatted text (fonts, colors), you would need to access additional properties like TextRange.LatinFont and TextRange.Fill .

Q4. Are there any limitations on file size when reading PowerPoint files in Python?

While Spire.Presentation can handle most standard presentations, extremely large files (hundreds of MB) may require optimization for better performance.

Q5. Can I create or modify PowerPoint documents using Spire.Presentation?

Yes, you can create PowerPoint documents and modify existing ones using Spire.Presentation. The library provides a range of features that allow you to add new slides, insert text, images, tables, and shapes, as well as edit existing content.

Get a Free License

To fully experience the capabilities of Spire.Presentation for Python without any evaluation limitations, you can request a free 30-day trial license.

Creating PowerPoint presentations programmatically can save time and enhance efficiency in generating reports, slideshows, and other visual presentations. By automating the process, you can focus on content and design rather than manual formatting.

In this tutorial, we will explore how to create PowerPoint documents in Python using Spire.Presentation for Python. This powerful tool allows developers to manipulate and generate PPT and PPTX files seamlessly.

Table of Contents:

• Python Library to Work with PowerPoint Files
• Installing Spire.Presentation for Python
• Creating a PowerPoint Document from Scratch
  • Generate and Save a Blank Presentation
  • Add Basic Elements to Your Slides
  • Apply a Background Image or Color
• Creating PowerPoint Documents Based on a Template
• Best Practices for Python PowerPoint Generation
• Wrap Up
• FAQs

1. Python Library to Work with PowerPoint Files

Spire.Presentation is a robust library for creating, reading, and modifying PowerPoint files in Python , without requiring Microsoft Office. This library supports a wide range of features, including:

• Create PowerPoint documents from scratch or templates.
• Add text, images, lists, tables, charts, and shapes.
• Customize fonts, colors, backgrounds, and layouts.
• Save as or export to PPT, PPTX, PDF, or images.

In the following sections, we will walk through the steps to install the library, create presentations, and add various elements to your slides.

2. Installing Spire.Presentation for Python

To get started, you need to install the Spire.Presentation library. You can install it using pip:

pip install spire.presentation

Once installed, you can begin utilizing its features in your Python scripts to create PowerPoint documents.

3. Creating a PowerPoint Document from Scratch

3.1 Generate and Save a Blank Presentation

Let's start by creating a basic PowerPoint presentation from scratch. The following code snippet demonstrates how to generate and save a blank presentation:

from spire.presentation.common import *
from spire.presentation import *

# Create a Presentation object
presentation = Presentation()

# Set the slide size type
presentation.SlideSize.Type = SlideSizeType.Screen16x9

# Add a slide (there is one slide in the document by default)
presentation.Slides.Append()

# Save the document as a PPT or PPTX file
presentation.SaveToFile("BlankPowerPoint.pptx", FileFormat.Pptx2019)
presentation.Dispose()

In this code:

• Presentation : Root class representing the PowerPoint file.
• SlideSize.Type : Sets the slide dimensions (e.g., SlideSizeType.Screen16x9 for widescreen).
• Slides.Append() : Adds a new slide to the presentation. By default, a presentation starts with one slide.
• SaveToFile() : Saves the presentation to the specified file format (PPTX in this case).

3.2 Add Basic Elements to Your Slides

Now that we have a blank presentation, let's add some basic elements like text, images, lists, and tables.

Add Formatted Text

To add formatted text, we can use the following code:

# Get the first slide
first_slide = presentation.Slides[0]

# Add a shape to the slide
rect = RectangleF.FromLTRB (30, 60, 900, 150)
shape = first_slide.Shapes.AppendShape(ShapeType.Rectangle, rect)
shape.ShapeStyle.LineColor.Color = Color.get_Transparent()
shape.Fill.FillType = FillFormatType.none

# Add text to the shape
shape.AppendTextFrame("This guide demonstrates how to create a PowerPoint document using Python.")

# Get text of the shape as a text range
textRange = shape.TextFrame.TextRange

# Set font name, style (bold & italic), size and color
textRange.LatinFont = TextFont("Times New Roman")
textRange.IsBold = TriState.TTrue
textRange.FontHeight = 32
textRange.Fill.FillType = FillFormatType.Solid
textRange.Fill.SolidColor.Color = Color.get_Black()

# Set alignment
textRange.Paragraph.Alignment = TextAlignmentType.Left

In this code:

• AppendShape() : Adds a shape to the slide. We create a rectangle shape that will house our text.
• AppendTextFrame() : Adds a text frame to the shape, allowing us to insert text into it.
• TextFrame.TextRange : Accesses the text range of the shape, enabling further customization such as font style, size, and color.
• Paragraph.Alignment : Sets the alignment of the text within the shape.

Add an Image

To include an image in your presentation, use the following code snippet:

# Get the first slide
first_slide = presentation.Slides[0]

# Load an image file
imageFile = "C:\\Users\\Administrator\\Desktop\\logo.png"
stream = Stream(imageFile)
imageData = presentation.Images.AppendStream(stream)

# Reset size
width = imageData.Width * 0.6
height = imageData.Height * 0.6

# Append it to the slide
rect = RectangleF.FromLTRB (750, 50, 750 + width, 50 + height)
image = first_slide.Shapes.AppendEmbedImageByImageData(ShapeType.Rectangle, imageData, rect)
image.Line.FillType = FillFormatType.none

In this code:

• Stream() : Creates a stream from the specified image file path.
• AppendStream() : Appends the image data to the presentation's image collection.
• AppendEmbedImageByImageData() : Adds the image to the slide at the specified rectangle coordinates.

You may also like: Insert Shapes in PowerPoint in Python

Add a List

To add a bulleted list to your slide, we can use:

# Get the first slide
first_slide = presentation.Slides[0]

# Specify list bounds and content
listBounds = RectangleF.FromLTRB(30, 150, 500, 350)
listContent = [
    " Step 1. Install Spire.Presentation for Python.",
    " Step 2. Create a Presentation object.",
    " Step 3. Add text, images, etc. to slides.",
    " Step 5. Set a background image or color.",
    " Step 6. Save the presentation to a PPT(X) file."
]

# Add a shape
autoShape = first_slide.Shapes.AppendShape(ShapeType.Rectangle, listBounds)
autoShape.TextFrame.Paragraphs.Clear()
autoShape.Fill.FillType = FillFormatType.none
autoShape.Line.FillType = FillFormatType.none

for content in listContent:
    # Create paragraphs based on the list content and add them to the shape
    paragraph = TextParagraph()
    autoShape.TextFrame.Paragraphs.Append(paragraph)
    paragraph.Text = content
    paragraph.TextRanges[0].Fill.FillType = FillFormatType.Solid
    paragraph.TextRanges[0].Fill.SolidColor.Color = Color.get_Black()
    paragraph.TextRanges[0].FontHeight = 20
    paragraph.TextRanges[0].LatinFont = TextFont("Arial")

    # Set the bullet type for these paragraphs
    paragraph.BulletType = TextBulletType.Symbol

    # Set line spacing
    paragraph.LineSpacing = 150

In this code:

• AppendShape() : Creates a rectangle shape for the list.
• TextFrame.Paragraphs.Append() : Adds paragraphs for each list item.
• BulletType : Sets the bullet style for the list items.

Add a Table

To include a table, you can use the following:

# Get the first slide
first_slide = presentation.Slides[0]

# Define table dimensions and data
widths = [200, 200, 200]
heights = [18, 18, 18, 18]
dataStr = [
    ["Slide Number", "Title", "Content Type"], 
    ["1", "Introduction", "Text/Image"], 
    ["2", "Project Overview", "Chart/Graph"],  
    ["3", "Key Findings", "Text/List"]
]

# Add table to the slide
table = first_slide.Shapes.AppendTable(30, 360, widths, heights)

# Fill table with data and apply formatting
for rowNum, rowData in enumerate(dataStr):
    for colNum, cellData in enumerate(rowData):  
        cell = table[colNum, rowNum]
        cell.TextFrame.Text = cellData
        
        textRange = cell.TextFrame.Paragraphs[0].TextRanges[0]
        textRange.LatinFont = TextFont("Times New Roman")
        textRange.FontHeight = 20
        
        cell.TextFrame.Paragraphs[0].Alignment = TextAlignmentType.Center

# Apply a built-in table style
table.StylePreset = TableStylePreset.MediumStyle2Accent1

In this code:

• AppendTable() : Adds a table to the slide at specified coordinates with defined widths and heights for columns and rows.
• Cell.TextFrame.Text : Sets the text for each cell in the table.
• StylePreset : Applies a predefined style to the table for enhanced aesthetics.

3.3 Apply a Background Image or Color

To set a custom background for your slide, use the following code:

# Get the first slide
first_slide = presentation.Slides[0]

# Get the background of the first slide
background = first_slide.SlideBackground

# Create a stream from the specified image file
stream = Stream("C:\\Users\\Administrator\\Desktop\\background.jpg")
imageData = presentation.Images.AppendStream(stream)

# Set the image as the background 
background.Type = BackgroundType.Custom
background.Fill.FillType = FillFormatType.Picture
background.Fill.PictureFill.FillType = PictureFillType.Stretch
background.Fill.PictureFill.Picture.EmbedImage = imageData

In this code:

• SlideBackground : Accesses the background properties of the slide.
• Fill.FillType : Specifies the type of fill (in this case, an image).
• PictureFill.FillType : Sets how the background image is displayed (stretched, in this case).
• Picture.EmbedImage : Sets image data for the background.

For additional background options, refer to this tutorial: Set Background Color or Picture for PowerPoint Slides in Python

Output:

Below is a screenshot of the PowerPoint document generated by the code snippets provided above.

4. Creating PowerPoint Documents Based on a Template

Using templates can simplify the process of creating presentations by allowing you to replace placeholders with actual data. Below is an example of how to create a PowerPoint document based on a template:

from spire.presentation.common import *
from spire.presentation import *

# Create a Presentation object
presentation = Presentation()

# Load a PowerPoint document from a specified file path
presentation.LoadFromFile("C:\\Users\\Administrator\\Desktop\\template.pptx")

# Get a specific slide from the presentation
slide = presentation.Slides[0]

# Define a list of replacements where each tuple consists of the placeholder and its corresponding replacement text
replacements = [
    ("{project_name}", "GreenCity Solar Initiative"),
    ("{budget}", "$1,250,000"),
    ("{status}", "In Progress (65% Completion)"),
    ("{start_date}", "March 15, 2023"),
    ("{end_date}", "November 30, 2024"),
    ("{manager}", "Emily Carter"),
    ("{client}", "GreenCity Municipal Government")
]

# Iterate through each replacement pair
for old_string, new_string in replacements:

    # Replace the first occurrence of the old string in the slide with the new string
    slide.ReplaceFirstText(old_string, new_string, False)

# Save the modified presentation to a new file
presentation.SaveToFile("Template-Based.pptx", FileFormat.Pptx2019)
presentation.Dispose()

In this code:

• LoadFromFile() : Loads an existing PowerPoint file that serves as the template.
• ReplaceFirstText() : Replaces placeholders within the slide with actual values. This is useful for dynamic content generation.
• SaveToFile() : Saves the modified presentation as a new file.

Output:

5. Best Practices for Python PowerPoint Generation

When creating PowerPoint presentations using Python, consider the following best practices:

• Maintain Consistency : Ensure that the formatting (fonts, colors, styles) is consistent across slides for a professional appearance.
• Modular Code: Break document generation into functions (e.g., add_list(), insert_image()) for reusability.
• Optimize Images : Resize and compress images before adding them to presentations to reduce file size and improve loading times.
• Use Templates : Whenever possible, use templates to save time and maintain a cohesive design.
• Test Your Code : Always test your presentation generation code to ensure that all elements are added correctly and appear as expected.

6. Wrap Up

In this tutorial, we explored how to create PowerPoint documents in Python using the Spire.Presentation library. We covered the installation, creation of presentations from scratch, adding various elements, and using templates for dynamic content generation. With these skills, you can automate the creation of presentations, making your workflow more efficient and effective.

7. FAQs

Q1. What is Spire.Presentation?

Spire.Presentation is a powerful library used for creating, reading, and modifying PowerPoint files in various programming languages, including Python.

Q2. Does this library require Microsoft Office to be installed?

No, Spire.Presentation operates independently and does not require Microsoft Office.

Q3. Can I customize the layout of slides in my presentation?

Yes, you can customize the layout of each slide by adjusting properties such as size, background, and the placement of shapes, text, and images.

Q4. Does Spire.Presentation support both PPT and PPTX format?

Yes, Spire.Presentation supports both PPT and PPTX formats, allowing you to create and manipulate presentations in either format.

Q5. Can I add charts to my presentations?

Yes, Spire.Presentation supports the addition of charts to your slides, allowing you to visualize data effectively. For detailed instruction, refer to: How to Create Column Charts in PowerPoint Using Python

Get a Free License

To fully experience the capabilities of Spire.Presentation for Python without any evaluation limitations, you can request a free 30-day trial license.

Optical Character Recognition (OCR) technology bridges the physical and digital worlds by converting text within images into machine-readable data. For .NET developers, the ability to extract text from images in C# is essential for building intelligent document processing, automated data entry, and accessibility solutions.

In this article, we’ll explore how to implement OCR in C# using the Spire.OCR for .NET library, covering basic extraction, advanced features like coordinate tracking, and best practices to ensure accuracy and efficiency.

Table of Contents:

• Understanding OCR and Spire.OCR
• Setting Up Your OCR Environment
• Basic Recognition: Extract Text from Images in C#
• Advanced Extraction: Extract Text with Coordinates in C#
• Tips to Optimize OCR Accuracy
• FAQs (Supported Languages and Image Formats)
• Conclusion & Free License

Understanding OCR and Spire.OCR

What is OCR?

OCR technology analyzes images of text - such as scanned documents, screenshots, or photos - and converts them into text strings that can be edited, searched, or processed programmatically.

Why Spire.OCR Stands Out?

Spire.OCR for .NET is a powerful, developer-friendly library that enables highly accurate text recognition from images in C# applications. Key features include:

• Support for multiple languages (English, Chinese, Japanese, etc.).
• High accuracy recognition algorithms optimized for various fonts and styles.
• Text coordinate extraction for precise positioning.
• Batch processing capabilities.
• Compatibility with .NET Framework and .NET Core.

Setting Up Your OCR Environment

Before diving into the C# code for image to text OCR operations, configure your development environment first:

1. Install via NuGet:

Open the NuGet Package Manager in Visual Studio. Search for "Spire.OCR" and install the latest version in your project. Alternatively, use the Package Manager Console:

Install-Package Spire.OCR

2. Download OCR Models:

Spire.OCR relies on pre-trained models to recognize image text. Download the model files for your operating system:

• Windows x64
• Linux x64
• MacOS 10.15 and later

After downloading, extract to a directory (e.g., F:\OCR Model\win-x64)

Important Note: Remember to change the platform target of your solution to x64 as Spire.OCR only supports 64-bit platforms.

Basic Recognition: Extract Text from Images in C#

Let’s start with a simple example that demonstrates how to read text from an image using Spire.OCR.

C# code to get text from an image:

using Spire.OCR;
using System.IO;

namespace OCRTextFromImage
{
    internal class Program
    {
        static void Main(string[] args)
        {

            // Create an instance of the OcrScanner class
            OcrScanner scanner = new OcrScanner();

            // Create an instance of the ConfigureOptions class
            ConfigureOptions configureOptions = new ConfigureOptions();

            // Set the path to the OCR model
            configureOptions.ModelPath = "F:\\OCR Model\\win-x64";

            // Set the language for text recognition. (The default is English.)
            configureOptions.Language = "English";

            // Apply the configuration options to the scanner
            scanner.ConfigureDependencies(configureOptions);

            // Scan image and extract text
            scanner.Scan("sample.png");

            // Save the extracted text to a txt file
            string text = scanner.Text.ToString();
            File.WriteAllText("output.txt", text);
        }
    }
}

Code Explanation:

• OcrScanner: Core class for text recognition.
• ConfigureOptions: Sets OCR parameters:
  • ModelPath: Specifies the path to the OCR model files.
  • Language: Defines the recognition language (e.g., "English", "Chinese").
• Scan(): Processes image and extracts text using the configured settings.

Output:

This C# code processes an image file (sample.png) and saves the extracted text to a text file (output.txt) using File.WriteAllText().

Advanced Extraction: Extract Text with Coordinates in C#

In many cases, knowing the position of extracted text within an image is as important as the text itself - for example, when processing invoices, forms, or structured documents. Spire.OCR allows you to extract not just text but also the coordinates of the text blocks, enabling precise analysis.

C# code to extract text with coordinates from an Image:

using Spire.OCR;
using System.Collections.Generic;
using System.IO;

namespace OCRWithCoordinates
{
    internal class Program
    {
        static void Main(string[] args)
        {

            // Create an instance of the OcrScanner class
            OcrScanner scanner = new OcrScanner();

            // Create an instance of the ConfigureOptions class
            ConfigureOptions configureOptions = new ConfigureOptions();

            // Set the path to the OCR model
            configureOptions.ModelPath = "F:\\OCR Model\\win-x64";

            // Set the language for text recognition. (The default is English.)
            configureOptions.Language = "English";

            // Apply the configuration options to the scanner
            scanner.ConfigureDependencies(configureOptions);

            // Extract text from an image
            scanner.Scan("invoice.png");

            // Get the OCR result text
            IOCRText text = scanner.Text;

            // Create a list to store information
            List<string> results = new List<string>();

            // Iterate through each block of the OCR result text
            foreach (IOCRTextBlock block in text.Blocks)
            {
                // Add the text of each block and its location information to the list
                results.Add($"Block Text: {block.Text}");
                results.Add($"Coordinates: {block.Box}");
                results.Add("---------");
            }

            // Save the extracted text with coordinates to a txt file
            File.WriteAllLines("ExtractWithCoordinates.txt", results);
        }
    }
}

Critical Details

• IOCRText: Represents the entire OCR result.
• IOCRTextBlock: Represents a block of contiguous text (e.g., a paragraph, line, or word).
• IOCRTextBlock.Box: Contains the rectangular coordinates of the text block:
  • X (horizontal position)
  • Y (vertical position)
  • Width
  • Height

Output:

This C# code performs OCR on an image file (invoice.png), extracting both the recognized text and its position coordinates in the image, then saves this information to a text file (ExtractWithCoordinates.txt).

Tips to Optimize OCR Accuracy

To ensure reliable results when using C# to recognize text from images, consider these best practices:

• Use high-resolution images (300 DPI or higher).
• Preprocess images (e.g., resize, deskew) for better results.
• Ensure correct language settings correspond to the text in image.
• Store OCR models in a secure, accessible location.

FAQs (Supported Languages and Image Formats)

Q1: What image formats does Spire.OCR support?

A: Spire.OCR supports all common formats:

• PNG
• JPEG/JPG
• BMP
• TIFF
• GIF

Q2: What languages does Spire.OCR support?

A: Multiple languages are supported:

• English (default)
• Chinese (Simplified and Traditional)
• Japanese
• Korean
• German
• French

Q3: Can I use Spire.OCR in ASP.NET Core applications?

A: Yes. Supported environments:

• .NET Framework 2.0+
• .NET Standard 2.0+
• .NET Core 2.0+
• .NET 5

Q4: Can Spire.OCR extract text from scanned PDFs in C#?

A: The task requires the Spire.PDF integration to convert PDFs to images or extract images from scanned PDFs first, and then use the above C# examples to get text from the images.

Conclusion & Free License

Spire.OCR for .NET provides a powerful yet straightforward solution for extracting text from images in C# applications. Whether you’re building a simple tool to convert images to text or a complex system for processing thousands of invoices, by following the techniques and best practices outlined in this guide, you can integrate OCR functionality into your C# applications with ease.

Request a 30-day trial license here to get unlimited OCR capabilities and unlock valuable information trapped in visual format.