I'm trying to figure out how to use the frei0r.curves filter in melt 0.8.8.
I am trying to increase the brightness/luma of a video. I got the parameter
values from kdenlive, but have been unable to replicate the effect in melt.
I only created one additional point in kdenlive Curves, with values x=502,
y=807.
First, I tried to use regular Curves in melt:
melt tmp1Front_00001.mp4 -filter frei0r.curves Channel=0.4 "Curve point
number"=0.3 "Point 1 input value"=0 "Point 1 output value"=0 "Point 2
input value"=.502 "Point 2 output value"=.807 "Point 3 input value"=1
"Point 3 output value"=1
...this seemed to have no effect.
Then I tried to use the values directly from kdenlive instead of using x/y
values between 0 - 1, as indicated in the melt -query filter="frei0r.curves"
melt tmp1Front_00001.mp4 -filter frei0r.curves Channel=0.4 "Curve point
number"=0.3 "Point 1 input value"=0 "Point 1 output value"=0 "Point 2
input value"=.502 "Point 2 output value"=.807 "Point 3 input value"=1
"Point 3 output value"=1
...this had an effect - the image got brighter, but did not look like the
image modified in kdenlive. Also, the Curves chart drawn in the image was
comprised of straight lines, rather than the curved line shown in kdenlive.
Then I tried Bezier spline:
melt tmp1Front_00001.mp4 -filter frei0r.curves Channel=0.4 'Bezier
spline=-1;-1#0;0#.1;.1|.356;.661#.406;.711#.456;.761|.9;.9#1;1#2;2'
...this seemed to have no effect on my image.
Any suggestions? Thanks.
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