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Learn how a JPG works with this interactive fuckery tutorial

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- Thu, 30 May 2019 04:48:22 EST 2D6pTKeg No.37875
File: 1559206102457.png -(572906B / 559.48KB, 1391x502) Thumbnail displayed, click image for full size. Learn how a JPG works with this interactive fuckery tutorial
https://parametric.press/issue-01/unraveling-the-jpeg/

Pretty cool, can fuck with an image live and learn how it all fits together.
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Fuck Blagglecocke - Thu, 30 May 2019 14:32:16 EST Vu8mgKGQ No.37876 Reply
>>37875
That's a cool writeup, thanks.
I always wanted to make a sparse jpeg decoder, meaning it only decodes the first term of the DCT coefficient for each macro block and spits out an image that's 1/8th the resolution.
This should result in something that spits out a thumbnail image, but much faster. I even think this could be generalized to h264 video frames too.

Pretty useful considering how creating thumbnails is so slow in any os.
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Phineas Hivingmack - Fri, 31 May 2019 11:19:20 EST 2D6pTKeg No.37879 Reply
>>37876
You should definitely do it, then! If you see something that you could do better that isn't currently being done as well as it could be, and you do it, you are advancing humanity. This justifies your existence forever.
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Charles Fillermick - Sun, 30 Jun 2019 19:49:05 EST QdPKZn3P No.37900 Reply
1561938545647.jpg -(1494B / 1.46KB, 100x100) Thumbnail displayed, click image for full size.
it should be possible to make pixel perfect art and fonts finding the right wavelets right? would be cool to make a game or something using that
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Fanny Sibberbury - Thu, 18 Jul 2019 12:10:28 EST a9BpE8FS No.37919 Reply
>>37900
You could.
It would be kind of like pixel art just instead of picking color values you pick a which coefficients each macro block should contain.
You would start by writing a graphics editor for the task.
Something like select a macro block and then select which "wavelets" apply to that block.

Could be a neat trick for 4k demo completions or games that should run on 8bit embedded cpus.

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