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submitted 2 months ago by hmmm@sh.itjust.works to c/animemes@ani.social
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[-] abfarid@startrek.website 45 points 2 months ago

No way media compressed 5x.

[-] Anafabula@discuss.tchncs.de 15 points 2 months ago

Maybe they store images as uncompressed .bmp for some reason

[-] Lichtblitz@discuss.tchncs.de 4 points 2 months ago

bmp should not compress more than other media files. jpeg, png, etc. can compress so much because they are lossy

[-] Kwdg@discuss.tchncs.de 11 points 2 months ago
[-] Lichtblitz@discuss.tchncs.de 2 points 2 months ago

You're right. png can be lossy but that's uncommon in the wild.

[-] Anafabula@discuss.tchncs.de 4 points 2 months ago* (last edited 2 months ago)

Three files of the same image: A png (15.7MiB), a bmp (28.8MiB) and a bmp.zip (16.4MiB)

PNG actually uses the same compression algorithm as ZIP (DEFLATE).
Here are the files.

[-] Lichtblitz@discuss.tchncs.de 3 points 2 months ago* (last edited 2 months ago)

The image doesn't look like a photo. The meme is about porn. Digital images can contain large areas of repeating patterns (uniform color areas for example) that can be compressed losslessly pretty well. Even slight noise from an image sensor can block that kind of compression.

[-] Anafabula@discuss.tchncs.de 7 points 2 months ago* (last edited 2 months ago)

With a picture from Unsplash:
Three files of the same image: A png (34.5MiB), a png.zip (34.5MiB), a jpg (4.9MiB), a bmp (98.2MiB) and a bmp.zip (65.1MiB)

ZIP compression of bmp is worse, but still compresses more than png. Here are the files.

[-] Lichtblitz@discuss.tchncs.de 5 points 2 months ago* (last edited 2 months ago)

Fascinating. That's much more than I expected. Thanks for taking the time.

[-] reev@sh.itjust.works 2 points 2 months ago

Was thinking the same thing

[-] hmmm@sh.itjust.works 1 points 2 months ago

Why are you surpried? It's actually possible. You just need so much computing power like around 64 GB ram and High End CPU to Pack and Unpack both.

[-] abfarid@startrek.website 7 points 2 months ago* (last edited 2 months ago)

Because modern media files are already compressed by default and have very little redundancy in them.

this post was submitted on 02 Feb 2025
254 points (94.4% liked)

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