I got somehow stuck with the cc.saturate.ip.jxs shader. I have tried a lot and was also looking inside the orange book but I cannot get it to work.
I always get the following error message:
setting GLSL param: GL Error: Invalid operation
Any help is appreciated.
G5 DC 2.3GHz
This error message is harmless, and you can ignore. You can solve it
by changing the image parameter in the XML description from "float"
to "int". This just selects which input is the source which doesn’t
even make much sense for this shader. You could alternately eliminate
the XML descriptions for the "image" parameter entirely to also
eliminate this harmless message. We will fix in the next release.
In order to see the saturation, please send the message "alpha
original saturation (1.), or even values outside the range of zero to
one to over/under saturate. It is just a crossfade amount between the
luminance version and original.
the commenting of the "image" stuff and sending "param alpha $1" did the trick.
At least this answer saved my day (night) :-)
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