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Optimize PNGs #71648
Description
| BPO | 27461 |
|---|---|
| Nosy | @vstinner, @scop |
| Files |
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields:
assignee = None
closed_at = None
created_at = <Date 2016-07-07.12:29:34.334>
labels = ['type-feature', 'docs']
title = 'Optimize PNGs'
updated_at = <Date 2018-06-16.15:37:41.531>
user = 'https://github.com/scop'bugs.python.org fields:
activity = <Date 2018-06-16.15:37:41.531>
actor = 'willingc'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2016-07-07.12:29:34.334>
creator = 'scop'
dependencies = []
files = ['43896']
hgrepos = []
issue_num = 27461
keywords = ['patch']
message_count = 5.0
messages = ['269929', '269930', '269931', '269932', '271377']
nosy_count = 3.0
nosy_names = ['vstinner', 'scop', 'docs@python']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue27461'
versions = []
Activity
scop commentedon Jul 7, 2016
Running PNGs through zopflipng makes them smaller, with no drawbacks. This patch was done with zopflipng version 1.0.1 with the -m option, and decreases the in-tree total size size of all *.png by almost 100KiB.
vstinner commentedon Jul 7, 2016
Hi, The idea is interesting, but IMO it would be more efficient to contribute to Sphinx, so all documentations will benefit of smallest pictures. There is a similar tool for JPEG. Victor
scop commentedon Jul 7, 2016
Sure, I plan to suggest this to sphinx as well.
One corresponding tool for JPEGs is jpegoptim and its --strip-all option, but there is only ./Mac/BuildScript/resources/background.jpg in the cpython source tree (which despite of the .jpg extension appears to be a PNG file so I don't want to touch that stuff), plus ./Lib/test/imghdrdata/python.jpg which isn't worth a patch alone :)
vstinner commentedon Jul 7, 2016
Oh funny, you're right: it's a PNG file :-)
scop commentedon Jul 26, 2016
Updated patch against tip.
Before: 289426 total
After: 194638 total
StanFromIreland commentedon Sep 12, 2025
This was already done in #74845
I will check if doing it again has any benefit
gh-71648: Remove unused image `Doc/faq/python-video-icon.png` (GH-138841
gh-71648: Optimize PNG files (GH-138842)
[3.14] pythongh-71648: Optimize PNG files (pythonGH-138842)
[3.13] pythongh-71648: Optimize PNG files (pythonGH-138842)
StanFromIreland commentedon Sep 12, 2025
For reference, adding a
pre-commithook to automatically optimize is tracked in #138848[3.13] gh-71648: Optimize PNG files (GH-138842) (#138852)
[3.14] gh-71648: Optimize PNG files (GH-138842) (GH-138851)
kerajbereta-code commentedon Sep 16, 2026