this post was submitted on 25 Oct 2024
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Lemmy

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Why does Lemmy have such a small image size limit? (lemmy.ml)
submitted 1 week ago by [email protected] to c/[email protected]
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Basically title. I can't send anything without compressing it a lot (to like 256 colors).

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[โ€“] khannie 12 points 1 week ago* (last edited 1 week ago) (1 children)

You can make nearly all images small enough to upload and still look good without dropping colour depth. There are 3 ways to achieve it basically:

  • Resize it to a lower resolution (1280 x whatever looks just fine on a screen)
  • Reduce the quality
  • Change to lossy (JPG) from non-lossy (PNG)

The resizing is usually enough.

The quality reduction is something that google pagespeed focuses on too. For most apps that means choosing a lower "quality" when converting to jpg or saving as a new jpg. 85% of original is good.

If you happen to have imagemagick installed, I have a little script that I use called "resize_to_pagespeed.sh". The jist of it is this:

convert inputfile.jpg -filter Lanczos -resize 1280x1280 -sampling-factor 4:2:0 -strip -quality 85 outputfile.jpg

I just ran this on a 2.4MB photo (below) and it came out at 186KB. That's a 13x reduction. Right click -> open in new tab to see it full size.

If the image isn't square, imagemagick is smart enough to figure out correct dimensions.

[โ€“] [email protected] 2 points 1 week ago

photos will never be pngs unless someone intentionally converts them to that format, as pngs are much worse than jpgs for storing this type of image. pngs are much better for computer generated images, such as screenshots, drawings, etc. you can also losslessly compress pngs with tools like pngcrush without converting them to jpg.