Lapis the Nevrean

@lapisnev

Don't squeeze me, I fart

she/her
dinobird.website/

Things that make you go 🤌. Weird computer stuff. Artist and general creative type. Occasionally funny. Gentoo on main. I play rhythm games!

You can post SVG files like photos on this website! Spread the word!

Lapis the Nevrean @lapisnev1/12/2023, 11:25 PM

Birdout: Paradise @SomeEgrets

arborelia @arborelia1/12/2023, 10:41 PM

I took an amazing JXL image and made it Worse

so I'm learning about JPEG XL (JXL)! I have an image viewer that supports it now (ImageGlass) and a Firefox addon that supports it in web pages, so I can look at the JPEG XL Art gallery.

The coolest thing on that site is Iceberg by 0b5vr, the first image on my post, a 2048x2048 image that is 34 bytes. Thirty-four bytes.

I know there's tons of entropy coding or whatever going on there, and so far I've made no effort to understand it. I decided to see which bits I can get away with flipping. Most of the changes I make give me an invalid JXL file, but some of them worked!

Flipping bit 0xb7 from 0 to 1 messed up all the vertical lines, replacing them with weird jaggies, and generally moved things to less aesthetically pleasing locations
Flipping bit 0xbb from 1 to 0 turned the green channel way down, leaving moody blue gradients
Flipping bit 0xe6 from 1 to 0 moved one of the formerly vertical lines even further out of place

with this highly derivative start I'm ready for the JXL demoscene!

#jpeg xl #i had to screenshot the image viewer to make these pngs

arborelia @arborelia1/12/2023, 10:49 PM

I applied just the last bit flip to the original image and actually that's pretty neat

#jpeg xl

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in reply to @arborelia's post:

Caro @caro1/12/2023, 10:51 PM

oo shiny

~@modulusshift1/12/2023, 10:55 PM

wow the png is almost 6000x larger than the jxl. Not really a fair comparison for many many reasons, but still.

Sora @HeySora1/12/2023, 11:27 PM

hi @0b5vr

Sora @HeySora1/12/2023, 11:31 PM

@arborelia here's Iceberg's "source code" in a readable form, if you wanna do other things than flip bits :)

https://jxl-art.surma.technology/?zcode=C3IOUTCy5AotKE7MLchJVTDicsosSUktKMlQMDTg4spMU0hWsFMw4FJQADIDilLLgDxDI1MgX0FBV8HPVUHXCMoOVzCEqAqHagAJOpal-2n7hSvoGkIFglNLFEyMLbgA

arborelia @arborelia1/12/2023, 11:39 PM

oh this is amazing! it looks like the main thing I accomplished was to change the number 438 in "Set 438". Now to figure out what these instructions mean

Sora @HeySora1/12/2023, 11:41 PM

instruction help: https://jxl-art.surma.technology/wtf.html

0b5vr @0b5vr1/13/2023, 4:20 PM

yeah that's pretty much everything I've learned to make that piece. I wish I could've dug into binaries but couldn't make it

0b5vr @0b5vr1/13/2023, 4:18 PM

and so far I've made no effort to understand it

me neither

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