[FFmpeg-trac] #5397(avfilter:open): Incorrect curves filter work
FFmpeg
trac at avcodec.org
Sun Jul 17 18:09:04 EEST 2016
#5397: Incorrect curves filter work
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Reporter: Ilya87 | Owner:
Type: defect | Status: open
Priority: normal | Component: avfilter
Version: git-master | Resolution:
Keywords: curves | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 1 |
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Changes (by ubitux):
* analyzed: 0 => 1
* status: new => open
* reproduced: 0 => 1
Comment:
A patch can be found at http://ffmpeg.org/pipermail/ffmpeg-
devel/2016-July/196740.html
Note that the curves in Gimp and Photoshop doesn't behave the same at all.
After the patch is applied, in order to get a close behavior to what you
expect, you will have to use something like {{{-vf curves=r='0.037516/0
1/1':g='0.040103/0 1/1':b='0.059508/0 1/1'}}}. If you define points in
{{{(0;0}}} ({{{-vf curves=r='0/0 0.037516/0 1/1':g='0/0 0.040103/0
1/1':b='0/0 0.059508/0 1/1'}}}, the curves will be much curvy at the
origin and you will your unexpected darker output. This doesn't happen in
Gimp but is closer to what you observe in Photoshop. I will attach
screenshot of Gimp and PS to show this.
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Ticket URL: <https://trac.ffmpeg.org/ticket/5397#comment:8>
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