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] 4 points 1 month 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] 11 points 1 month ago (1 children)
[–] [email protected] 2 points 1 month ago

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

[–] [email protected] 4 points 1 month ago* (last edited 1 month 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] 3 points 1 month ago* (last edited 1 month 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] 7 points 1 month ago* (last edited 1 month 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] 5 points 1 month ago* (last edited 1 month ago)

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