Extracting Images from Presentation shapes

Images are added in slide background and shapes. Sometimes, it is required to extract the images added in the presentation shapes. The images are added in IPPImageCollection inside Presentation Document Object Model (DOM). This article covers the feature of accessing the images in presentation shape, extracting them from presentation collection and saving them in a file.

Extracting images from Presentation Shapes

In Aspose.Slides for .NET, images can be added to slide shape and slide background. The images are added in IPPImageCollection of the presentation. In this example we will traverse through each shape inside every slide of presentation and see if there is any image added in slide shape. If the image will be found for any shape, we will extract that and will save it in file.The following code snippet will serve the purpose.

public static void Run() {

    String path = @"D:\Aspose Data\";
    //Accessing the presentation
    Presentation pres = new Presentation(path + "ExtractImages.pptx");
    Aspose.Slides.IPPImage img = null;
    Aspose.Slides.IPPImage Backimg = null;

    int slideIndex = 0;
    String ImageType = "";
    bool ifImageFound = false;
    for (int i = 0; i < pres.Slides.Count; i++)
    {

        slideIndex++;
        //Accessing the first slide
        ISlide sl = pres.Slides[i];
        System.Drawing.Imaging.ImageFormat Format = System.Drawing.Imaging.ImageFormat.Jpeg;

        //Accessing the first slide Slide sl = pres.getSlideByPosition(i);
        if (sl.Background.FillFormat.FillType == FillType.Picture)
        {
            //Getting the back picture  
            Backimg = sl.Background.FillFormat.PictureFillFormat.Picture.Image;

            //Setting the desired picture format 

            ImageType = Backimg.ContentType;
            ImageType = ImageType.Remove(0, ImageType.IndexOf("/") + 1);
            Format = GetImageFormat(ImageType);

            String ImagePath = path + "BackImage_";
            Backimg.SystemImage.Save(ImagePath + "Slide_" + slideIndex.ToString() + "." + ImageType, Format);

        }
        else
        {
            if (sl.LayoutSlide.Background.FillFormat.FillType == FillType.Picture)
            {
                //Getting the back picture  
                Backimg = sl.LayoutSlide.Background.FillFormat.PictureFillFormat.Picture.Image;

                //Setting the desired picture format 

                ImageType = Backimg.ContentType;
                ImageType = ImageType.Remove(0, ImageType.IndexOf("/") + 1);
                Format = GetImageFormat(ImageType);

                String ImagePath = path + "BackImage_Slide_" + i;
                Backimg.SystemImage.Save(ImagePath + "LayoutSlide_" + slideIndex.ToString() + "." + ImageType, Format);

            }
        }

        for (int j = 0; j < sl.Shapes.Count; j++)
        {
            // Accessing the shape with picture
            IShape sh = sl.Shapes[j];

            if (sh is AutoShape)
            {
                AutoShape ashp = (AutoShape)sh;
                if (ashp.FillFormat.FillType == FillType.Picture)
                {
                    img = ashp.FillFormat.PictureFillFormat.Picture.Image;
                    ImageType = img.ContentType;
                    ImageType = ImageType.Remove(0, ImageType.IndexOf("/") + 1);
                    ifImageFound = true;

                }
            }

            else if (sh is PictureFrame)
            {
                IPictureFrame pf = (IPictureFrame)sh;
                if (pf.FillFormat.FillType == FillType.Picture)
                {
                    img = pf.PictureFormat.Picture.Image;
                    ImageType = img.ContentType;
                    ImageType = ImageType.Remove(0, ImageType.IndexOf("/") + 1);
                    ifImageFound = true;
                }
            }

            //Setting the desired picture format
            if (ifImageFound)
            {
                Format = GetImageFormat(ImageType);
                String ImagePath = path + "Slides\\Image_";
                img.SystemImage.Save(ImagePath + "Slide_" + slideIndex.ToString() + "_Shape_" + j.ToString() + "." + ImageType, Format);
            }
            ifImageFound = false;
        }
    }
}

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;
}