C# image manipulation using a console application throwing 'Out of Memory' Exception

Question

I have a console application that successfully re-sizes an image while maintaining aspect ratio.

I now need to crop the image the code I am using is below:

using (var thumbnail = CropPicture(image, rectangle)) {
    EncoderParameters encParams = new EncoderParameters(1);
    encParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)90);

    thumbnail.Save(destination, GetImageCodecInfo(image.RawFormat), encParams); 
}

public static Image CropPicture(Image source, Rectangle cropArea) {
    using (var bitmap = new Bitmap(source)) {
        return (Image)(bitmap.Clone(cropArea, source.PixelFormat));
    }
}

It seems to be throwing an Out of memory exception on the line

return (Image)(bitmap.Clone(cropArea, source.PixelFormat));

Any ideas what's going on? I think it's an open file can't be 100% sure.

Answer 1

According to the MSDN documentation, Bitmap.Clone(Rectangle, PixelFormat) can throw an OutOfMemoryException if the first parameter is "outside of the source bitmap bounds".

Verify the first parameter to Bitmap.Clone; make sure that the rect is entirely within the bounds of the image.

Answer 2

instead of returning the Image inside the using why not create a reference before returning it inside the using statement.

public static Image CropPicture(Image source, Rectangle cropArea) {
    Bitmap retImg;
    using (var bitmap = new Bitmap(source)) {
        retImg = bitmap.Clone(cropArea, source.PixelFormat);
    }
    return (Image)regImg;
}

I'm not sure but it looks like the Bitmap is not disposed before you return the image.