import com.spire.pdf.*;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;


public class PdftoImage {
    public static void main(String[] args) throws Exception {

        //Create an object of PdfDocument class.
        PdfDocument pdf = new PdfDocument();
        
        //Load the sample PDF document
        pdf.loadFromFile("Sample.pdf");
        
        //Specify the background transparent value as 0 during PDF to image conversion.
        pdf.getConvertOptions().setPdfToImageOptions(0);

        //Save PDF to .png image
        BufferedImage image = pdf.saveAsImage(0);
        File file = new File( String.format("ToImage.png"));
        ImageIO.write(image, "PNG", file);
    }
}

using Spire.Presentation;

namespace DistributeRowsAndColumns
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Presentation instance
            Presentation presentation = new Presentation();

            //Load the PowerPoint document
            presentation.LoadFromFile(@"C:\Users\Administrator\Desktop\Table.pptx");

            //Get the first slide
            ISlide slide = presentation.Slides[0];

            //Loop through the shapes
            for (int i = 0; i < slide.Shapes.Count; i++)
            {
                //Determine if a shape is table
                if (slide.Shapes[i] is ITable)
                {
                    //Get the table in the slide
                    ITable table = (ITable)slide.Shapes[i];

                    //Distribute table rows
                    table.DistributeRows(0, table.TableRows.Count-1);

                    //Distribute table columns
                    table.DistributeColumns(0, table.ColumnsList.Count-1);

                }
            }

            //Save the result to file
            presentation.SaveToFile("DistributeRowsAndColumns.pptx", FileFormat.Pptx2013);
        }
    }
}

Imports Spire.Presentation
 
Namespace DistributeRowsAndColumns
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a Presentation instance
            Dim presentation As Presentation =  New Presentation() 
 
            'Load the PowerPoint document
            presentation.LoadFromFile("C:\Users\Administrator\Desktop\Table.pptx")
 
            'Get the first slide
            Dim slide As ISlide =  presentation.Slides(0) 
 
            'Loop through the shapes
            Dim i As Integer
            For  i = 0 To  slide.Shapes.Count- 1  Step  i + 1
                'Determine if a shape is table
                If TypeOf slide.Shapes(i) Is ITable Then
                    'Get the table in the slide
                    Dim table As ITable = CType(slide.Shapes(i), ITable)
 
                    'Distribute table rows
                    table.DistributeRows(0, table.TableRows.Count-1)
 
                    'Distribute table columns
                    table.DistributeColumns(0, table.ColumnsList.Count-1)
 
                End If
            Next
 
            'Save the result to file
            presentation.SaveToFile("DistributeRowsAndColumns.pptx", FileFormat.Pptx2013)
        End Sub
    End Class
End Namespace

PM> Install-Package Spire.XLS

using Spire.Xls;
using Spire.Xls.Collections;
using System.Drawing;

namespace ReplacePictureinExcel
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Workbook instance 
            Workbook workbook = new Workbook();
            //Load the Excel file
            workbook.LoadFromFile (“Input.xls”);

            //Get the first sheet
            Worksheet sheet = workbook.Worksheets[0];

            //Get Excel picture collection
            PicturesCollection pictureCollection = sheet.Pictures;

            //Get the first picture from the collection 
            ExcelPicture excelPicture = pictureCollection[0];
            
            // Creates an Image from the specified file.
            excelPicture.Picture = Image.FromFile (image);

            //Save the document
            workbook.SaveToFile("ReplaceImage.xlsx", ExcelVersion.Version2013);
        }
    } 
}

Imports Spire.Xls
Imports Spire.Xls.Collections
Imports System.Drawing

Namespace ReplacePictureinExcel
	Class Program
		Private Shared Sub Main(args As String())

			'Create a Workbook instance 
			Dim workbook As New Workbook()
			'Load the Excel file
			workbook.LoadFromFile(Input.xls)

			'Get the first sheet
			Dim sheet As Worksheet = workbook.Worksheets(0)

			'Get Excel picture collection
			Dim pictureCollection As PicturesCollection = sheet.Pictures

			'Get the first picture from the collection 
			Dim excelPicture As ExcelPicture = pictureCollection(0)

			' Creates an Image from the specified file.
			excelPicture.Picture = Image.FromFile(image)

			'Save the document
			workbook.SaveToFile("ReplaceImage.xlsx", ExcelVersion.Version2013)
		End Sub
	End Class
End Namespace