After running our site for close to 1 year using the GD toolkit, I decided to move to ImageMagick today. We use it to generate smaller images (320px wide) for mobiles. The desktop versions are 700px-wide and were uploaded using GD.
The problem is, some of these new 320px-wide images have a very high filesize compared to the original 700px-wide images.. I've uploaded 2 images here to illustrate the problem.
banana.jpg - 700 x 577 - 20 KB
mobile-banana.jpg - 320 x 264 - 577 KB
This means we're sending significantly heavier images to mobiles... and we don't want to do this.
Note: If we delete the original GD-uploaded images and upload them via ImageMagick and then generate the mobile version, everything works perfect (i.e., the mobile banana is a much much smaller file).
Therefore, this appears to be some sort of interop issue between GD and ImageMagick. We have thousands of images uploaded via GD, and re-uploading all of them manually now is impossible.
Can someone help me out here? What can I do to make sure that the new mobile versions are at least of the same size as the old ones? Please! This is driving me crazy!
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