https://bugs.kde.org/show_bug.cgi?id=420449
Bug ID: 420449
Summary: add support for saving as (lossless) webp
Product: Spectacle
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: General
Assignee: m...@baloneygeek.com
Reporter: j...@vandenoever.info
CC: k...@david-redondo.de
Target Milestone: ---
SUMMARY
Files saved by spectacle can be quite large. Using oxipng or optipng can often
shave 30% of the size in a fraction of a second.
oxipng /tmp/Screenshot_20200423_111228.png
Processing: /tmp/Screenshot_20200423_111228.png
1411x1217 pixels, PNG format
4x8 bits/pixel, RGBA
IDAT size = 285460 bytes
File size = 285946 bytes
Trying: 8 combinations
Found better combination:
zc = 9 zs = 0 f = 0 203982 bytes
IDAT size = 203982 bytes (81478 bytes decrease)
file size = 204060 bytes (81886 bytes = 28.64% decrease)
Output: /tmp/Screenshot_20200423_111228.png
Even more space can be saved by saving as lossless webp. Webp is supported in
all new browsers. Making it the default is perhaps a bit early, but it would be
nice if spectable would remember the preference for webp.
STEPS TO REPRODUCE
$ cwebp -lossless /tmp/Screenshot_20200423_111228.png -o
/tmp/Screenshot_20200423_111228.webp
Saving file '/tmp/Screenshot_20200423_111228.webp'
File: /tmp/Screenshot_20200423_111228.png
Dimension: 1411 x 1217
Output: 92618 bytes (0.43 bpp)
Lossless-ARGB compressed size: 92618 bytes
* Header size: 2129 bytes, image data size: 90463
* Lossless features used: SUBTRACT-GREEN
* Precision Bits: histogram=5 transform=5 cache=10
OBSERVED RESULT
$ ls -l /tmp/Screenshot_20200423_111228.*
285946 23 apr 11:12 /tmp/Screenshot_20200423_111228.png
92618 23 apr 11:13 /tmp/Screenshot_20200423_111228.web
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 19.12
(available in About System)
KDE Plasma Version: 19.12
KDE Frameworks Version: 5.66
Qt Version: 5.12.7
ADDITIONAL INFORMATION
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