Extract Images from PowerPoint PPT in C#

readme.md

Learn how to extract images from PowerPoint presentations in C#: https://blog.aspose.com/2022/01/13/extract-images-from-ppt-in-csharp-net/

extract-ppt-background-images.cs

// Load the presentation
Presentation pres = new Presentation("presentation.pptx");
Aspose.Slides.IPPImage backImg = null;

int slideIndex = 0;
String imageType = "";
for (int i = 0; i < pres.Slides.Count; i++)
{
    slideIndex++;
    // Access the slide
    ISlide slide = pres.Slides[i];
    System.Drawing.Imaging.ImageFormat format = System.Drawing.Imaging.ImageFormat.Jpeg;

    // Check if background has picture
    if (slide.Background.FillFormat.FillType == FillType.Picture)
    {
        // Get picture  
        backImg = slide.Background.FillFormat.PictureFillFormat.Picture.Image;

        // Set picture format 
        imageType = backImg.ContentType;
        imageType = imageType.Remove(0, imageType.IndexOf("/") + 1);
        format = GetImageFormat(imageType);

        // Save image
        String imagePath = "BackImage_";
        backImg.SystemImage.Save(imagePath + "Slide_" + slideIndex.ToString() + "." + imageType, format);
    }
    else
    {
        if (slide.LayoutSlide.Background.FillFormat.FillType == FillType.Picture)
        {
            // Get background picture  
            backImg = slide.LayoutSlide.Background.FillFormat.PictureFillFormat.Picture.Image;

            // Set picture format 
            imageType = backImg.ContentType;
            imageType = imageType.Remove(0, imageType.IndexOf("/") + 1);
            format = GetImageFormat(imageType);

            // Save image
            String imagePath = "BackImage_Slide_" + i;
            backImg.SystemImage.Save(imagePath + "LayoutSlide_" + slideIndex.ToString() + "." + imageType, format);

        }
    }                
}

extract-ppt-images.cs

// Load the presentation
Presentation pres = new Presentation("presentation.pptx");

Aspose.Slides.IPPImage img = null;
ImageFormat format = System.Drawing.Imaging.ImageFormat.Jpeg;
int imageIndex = 1;
string imageType = "";
String imagePath = "Image_";

// Loop through images
foreach (var image in pres.Images)
{
    // Get image format
    format = GetImageFormat(image.ContentType);

    // Get image type
    imageType = image.ContentType;
    imageType = imageType.Remove(0, imageType.IndexOf("/") + 1);

    // Save image
    image.SystemImage.Save(imagePath + "Slide_" + imageIndex.ToString() + "." + imageType, format);
    imageIndex++;
}

extract-ppt-shape-images.cs

// Load the presentation
Presentation pres = new Presentation("presentation.pptx");

Aspose.Slides.IPPImage img = null;
int slideIndex = 0;
String imageType = "";
bool isImageFound = false;

// Loop through slides
for (int i = 0; i < pres.Slides.Count; i++)
{
    slideIndex++;
    // Access the slide
    ISlide slide = pres.Slides[i];
    System.Drawing.Imaging.ImageFormat format = System.Drawing.Imaging.ImageFormat.Jpeg;

    // Loop through the shapes
    for (int j = 0; j < slide.Shapes.Count; j++)
    {
        // Access the shape
        IShape sh = slide.Shapes[j];

        // Check is it is an auto shape
        if (sh is AutoShape)
        {
            AutoShape ashp = (AutoShape)sh;

            // Check if it has picture
            if (ashp.FillFormat.FillType == FillType.Picture)
            {
                // Get image
                img = ashp.FillFormat.PictureFillFormat.Picture.Image;
                imageType = img.ContentType;
                imageType = imageType.Remove(0, imageType.IndexOf("/") + 1);
                isImageFound = true;

            }
        }
        else if (sh is PictureFrame)
        {
            // If shape is a picture frame
            IPictureFrame pf = (IPictureFrame)sh;

            // Check if it contains a picture
            if (pf.FillFormat.FillType == FillType.Picture)
            {
                // Get image
                img = pf.PictureFormat.Picture.Image;
                imageType = img.ContentType;
                imageType = imageType.Remove(0, imageType.IndexOf("/") + 1);
                isImageFound = true;
            }
        }

        // If image is found then save it
        if (isImageFound)
        {
            format = GetImageFormat(imageType);
            String imagePath = "Image_";
            img.SystemImage.Save(imagePath + "Slide_" + slideIndex.ToString() + "_Shape_" + j.ToString() + "." + imageType, format);
        }

        isImageFound = false;
    }
}

get-image-format.cs

public static System.Drawing.Imaging.ImageFormat GetImageFormat(String ImageType)
{
    System.Drawing.Imaging.ImageFormat Format = System.Drawing.Imaging.ImageFormat.Jpeg;
    switch (ImageType)
    {
        case "jpeg":
            Format = System.Drawing.Imaging.ImageFormat.Jpeg;
            break;

        case "emf":
            Format = System.Drawing.Imaging.ImageFormat.Emf;
            break;

        case "bmp":
            Format = System.Drawing.Imaging.ImageFormat.Bmp;
            break;

        case "png":
            Format = System.Drawing.Imaging.ImageFormat.Png;
            break;

        case "wmf":
            Format = System.Drawing.Imaging.ImageFormat.Wmf;
            break;

        case "gif":
            Format = System.Drawing.Imaging.ImageFormat.Gif;
            break;

    }
    return Format;
}