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37 points by vinhnx 4 days ago | 5 comments

Rendered at 14:49:28 GMT+0000 (Coordinated Universal Time) with Cloudflare Workers.

mythz 8 minutes ago [-]

Worth highlighting the QOI Image format (qoiformat.org) showing that you can also get significant image compression benefits with a simple 1-page specification [1]:

> QOI is fast. It losslessly compresses images to a similar size of PNG, while offering 20x-50x faster encoding and 3x-4x faster decoding.

> QOI is simple. The reference en-/decoder fits in about 300 lines of C. The file format specification is a single page PDF.

[1] https://qoiformat.org/qoi-specification.pdf

thm 33 minutes ago [-]

I recently built a small image optimizer for macOS since ImageOptim is mostly abandonware now. Specifically for folks who dislike complex build tools for this job https://shiboru.com

Y-bar 1 minutes ago [-]

ImageOptim seems mostly done though. What more does it need to do compared to what it claims to do?

filup 4 days ago [-]

I love image and video compression. For fun, I made my own and managed to squeeze an image of myself into byte level file sizes.

It's amazing to me how we much we can fill in the blanks to make something recognizable with such little data.

Theodores 2 hours ago [-]

Most comprehensive write up of JPEG et al. I have ever come across.

I think the MozJPEG compression optimisations deserves a mention, as does where we started, with RLE encoding for printer things.

Also important for my personal understanding of JPEG is the context: slow CPUs and analogue screens. OG JPEG was optimised for this, MozJPEG changed the look up tables and the ubiquitous 'turbo' JPEG library to use a few more CPU cycles and save a few more bytes, whilst fixing the banding that was actually okay in the analogue days of old CRT monitors.

Bookmarked the article for re-reading.