KSksec·May 1, 2023Submission
Zpng: Better lossless compression than PNG with a simpler algorithm
5 points · Open discussioncatid
Zpng
C2018–2023
catid / Zpng
Zpng
Better lossless compression than PNG with a simpler algorithm
4Distinct people
4Mentions
0Explicit recommenders
311GitHub stars
What to know before exploring
What it is
Better lossless compression than PNG with a simpler algorithm
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
No recommendation phrase was found in the indexed comments.
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Also in these discussions
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This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 5:04:57 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year4 dated mentions
Observed mentions: 2018-05-04 10:40:48 UTC to 2023-05-01 12:35:12 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 1 | 1 | 0 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 1 | 1 | 0 |
What Hacker News says
4 sources> You'd probably get even better results by using PNG's filters instead of QOI
Did anybody ever try this? It would be quite interesting and does not seem too difficult.
The only thing I could find is https://github.com/catid/Zpng which does not use the normal PNG filtering.
In Quite OK Image is now my favorite asset formatNeat work.
Though I wouldn't be myself if I didn't have few nitpicks ;)
- You are mixing lossy and lossless compression in your rant. And you are mixing containers with formats. Thing about lossy compression is that it is by design stupidly slow and complex to produce smallest possible results which has best perceived quality. Compress once and trade time for both image and compression quality. Lossless is not that bad, although your simple solution is well, simple :)
- I feel like the benchmark suite is lacking. For better overview you probably should include libpng results with max compression level and lowest compression level. Lossless modes of AVIF and WEBP would be nice. (also could throw similar project to yours like https://github.com/catid/Zpng) Not saying the benchmark is bad, but IMHO doesn't paint the full picture. From quick
Read the rest
test I got significantly better compression on libpng, ofc in expense of time, but you didn't configure libpng for speed either. So we have some results, but they are not really representative imho.
- I understand it is pet project, but don't forget about importance of image metadata, like colorspace and so on.
- Also keep in mind that compression is easy at the beginning, but the tricky part is how to squeeze more.
EDIT: formatting...
Zpng – better PNG compression using Zstd
4 points · Open discussion