Stitching images of different resolutions doesn't sync the size

[himanpan]

If two images of different resolutions are used for creating a gif, the image with smaller resolution gets displayed in a shrunk size in the GIF, with rest of the space covered in white color.
This makes the GIF experience not so good.
It would be great if there is a way to match the image sizes while stitching them together!

[AbnerSquared]

The two ways I could see this working would be to either prevent being able to add a frame of an image that is larger than the main image size, or to downscale/upscale the image frame being added to match with the main image size. (Maybe something along the sides of AnimatedGif.DrawFrameFit(Image image), where it would draw the frame, and fit it accordingly to match with the current image size)