
Author: Meow
Crimson Ascension: Rite of Exposure
GPT Test Plugsuit High-Exposure Type
Reconquest (GPT Image 1)
-e 10 -E 4 -I 100 -g 3
Let’s see how much space this lossless “incantation” for JPEG XL could save for my 50 gigantic images.
Rough tests of Jpegli
Jpegli, a new JPEG coding library, does bring a significant compression ratio improvement, comparing to libjpeg-turbo and MozJPEG.
I selected 332 lossless non-photographic PNG images for some rough tests, on macOS Sonoma 14.4.1. The images were recorded after applied with ImageOptim‘s lossless optimisation for the minimal possible sizes, and Jpegli was directly from libjxl version 0.10.2.
The built-in JPEG library (quality at 90, supposed to be libjpeg-turbo?) encoded them to 174,095,425 bytes, MozJPEG (quality at 91) encoded them to 145,553,618 bytes, and Jpegli (quality at 92) encoded them to 128,006,534 bytes. That is about 26.5% smaller than libjpeg-turbo and 12% smaller than MozJPEG.
The quality values were tested initially with some images based on DSSIM, and the bonus 1 of MozJPEG and bonus 2 of Jpegli also reflected the latest benchmark by Jon Sneyers.
For fun, I tested Jpegli with XYB (–xyb), and the size becomes 112,809,722 bytes— even 11.9% smaller than conventional Jpegli. However, some softwares displayed thumbnails of XYB JPEG files with totally wrong colours.

Even without XYB, Jpegli is still the most competitive choice for encoding JPEG images.
Reconquest
petpet generator

You can use the generator to create an animation like that.
Liv’s character information
Character.md
A lively husky bouncing a pair of heavy breasts, whose something fat is lively too.
角色.md
活潑的哈士奇晃動很重的乳房,「肥肥的」某東西也很活潑。