Topic: What was the largest picture ever uploaded to the site?

Posted under Off Topic

alphamule

Privileged

m3g4p0n1 said:
Gotta love the fact the largest resolution image here is one with twitter compression

post #3521872

With such simple colors, that could probably be compressed to a PNG with roughly the same size as a 1-megapixel image.

Mairo

Janitor

One thing I noticed with new site that has been amazing, order:duration for lenghtiest file on site.
Doesn't support flash, APNG or GIF so it's not full truth, but still pretty neat.

faucet said:

Pretty sure most if not all of the largest ones are by me, because I calculate video encodings so close and use so low settings that I have even managed to have 100MB to show up as filesize, even though the site doesn't allow filesizes of 100MB exact or above.

kora_viridian said:
As downloaded: 1.37 million byte JPEG

With GIMP 2.10:

Exported to PNG with no other changes: 8.02 million byte PNG
Original converted to 256 colors, then exported to PNG: 3.04 million byte PNG
Original converted to 128 colors, then exported to PNG: 2.62 million byte PNG
Original converted to 16 colors, then exported to PNG: 1.03 million byte PNG

RIP my swap partition. :D

As PNG is truly lossless, even if you perceive something as solid color or decrease the amount of colors, it doesn't remove the junk that PNG still is trying to save.
Only real way of knowing if it actually turns out better as PNG rather than JPG is to have original export. Additionally PNG does have a lot of more technical aspects to it, so running GIMPs export through something like Pingo could save even further data, with stuff like this a lot.

Excluding animated and flash content, post #3369318 I was also helping. It's actually cropped slightly from left and bottom, then optimized so that we could have the artwork at original quality uploaded, alternative would've been lossy compression done and e621 doesn't support anything other than JPG even now (no WebP, AVIF or HEIF, color reduction would've been even worse with PNG).

After that it's post #3134496 which is the worst enemy of lossless compression: noise.
But even that seems to be possible to make 16.7MB smaller: 

PS> pingo -s9 .\8ab0cf3cf9d217514be22c059ad69ab7.png

  pingo - (25.01s):
  -----------------------------------------------------------------
  1 file => 16.70 MB - (16.77%) saved
  -----------------------------------------------------------------

alphamule

Privileged

mairo said:
One thing I noticed with new site that has been amazing, order:duration for lenghtiest file on site.
Doesn't support flash, APNG or GIF so it's not full truth, but still pretty neat.

Pretty sure most if not all of the largest ones are by me, because I calculate video encodings so close and use so low settings that I have even managed to have 100MB to show up as filesize, even though the site doesn't allow filesizes of 100MB exact or above.

As PNG is truly lossless, even if you perceive something as solid color or decrease the amount of colors, it doesn't remove the junk that PNG still is trying to save.
Only real way of knowing if it actually turns out better as PNG rather than JPG is to have original export. Additionally PNG does have a lot of more technical aspects to it, so running GIMPs export through something like Pingo could save even further data, with stuff like this a lot.

Excluding animated and flash content, post #3369318 I was also helping. It's actually cropped slightly from left and bottom, then optimized so that we could have the artwork at original quality uploaded, alternative would've been lossy compression done and e621 doesn't support anything other than JPG even now (no WebP, AVIF or HEIF, color reduction would've been even worse with PNG).

After that it's post #3134496 which is the worst enemy of lossless compression: noise.
But even that seems to be possible to make 16.7MB smaller: 

PS> pingo -s9 .\8ab0cf3cf9d217514be22c059ad69ab7.png

  pingo - (25.01s):
  -----------------------------------------------------------------
  1 file => 16.70 MB - (16.77%) saved
  -----------------------------------------------------------------

Yeah, was gonna assume that they injected with millions of resampled colors then reconverted back to lossless format like PNG.

aaronfranke

Member

kora_viridian said:
Original converted to 16 colors, then exported to PNG: 1.03 million byte PNG

You can get even smaller using a PNG optimizer. I tried converting the image to 16 colors and ran oxipng -o6 --strip all --zopfli --fix and I got it down to 761612 bytes.

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