My guess is that this is because of the interpolation when resampling.
Makes it less easily compressable. (Notice the 'anti-aliased' edges in
the resized picture?)

Marco Wessel

On Wed, 4 Jun 2003, Daniel Carrera wrote:

> Hi,
> This is really weird.  I have a PNG image.  I tried to make it smaller by
> resizing it down, but instead it got BIGGER.  I don't understand this at
> all.
> I put the images on the web:
> Original:
> Resized:
> With width and height of the resized image are 0.8 times the size of the
> original, so I would have imagined that the resized image would be
> 0.8*0.8 = 0.64 times the size of the original, but that's not the case:
> $ du -sk *
> 52      screenshot.png
> 128     screenshot_resized.png
> The new image is over 4 times bigger than the original!
> These are RGB images BTW, but that shouldn't cause this.
> Does anyone know what's happening?

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