this post was submitted on 02 Feb 2025
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Animemes

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Memes related to anime. Animemes.

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[–] [email protected] 3 points 6 hours ago (2 children)

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

[–] [email protected] 2 points 3 hours ago* (last edited 3 hours ago) (1 children)

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.

[–] [email protected] 2 points 3 hours ago* (last edited 3 hours ago) (1 children)

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.

[–] [email protected] 5 points 2 hours ago* (last edited 2 hours ago) (1 children)

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.

[–] [email protected] 4 points 1 hour ago* (last edited 1 hour ago)

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

[–] [email protected] 10 points 5 hours ago (1 children)
[–] [email protected] 1 points 3 hours ago

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