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Recently I have had to scale up the dimensions of a gif image by a factor of 2, this resulted in an increase of the file size by about 8 times. While this is not a complete surprise, I can't help but think there should be a format that scales well with such an operation.

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  • Can the image be remade as a Vector image or are you stuck as Raster?
    – Scott Chamberlain
    Nov 14, 2012 at 19:23
  • @ScottChamberlain actually you brought up a good point, except that what I had in mind was something to be used with google maps
    – prusswan
    Nov 14, 2012 at 19:36
  • Google maps stores it's data as tiles, then does small shrink (never expand) as you zoom out. Once you have zoomed out enough it sends a new image at the same resolution as the old one but at a different scale.
    – Scott Chamberlain
    Nov 14, 2012 at 20:37

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Compression in GIF images is quite primitive and cannot take advantage of redundancy created by upscaling of the image.

I you resize without anti-aliasing then well-optimized PNG shouldn't grow by much.

If you resize with anti-aliasing then convert the image to JPEG, as this will create lots of new colors and soft edges that are best handled by JPEG.

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