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RGBA to sldier values using sample image
Hi Guys
Been bashing my head against a few proverbial brick walls whilst searching these forums on an expression I need.
Basically I want to take the Hue and alpha values of a solid with the advanced lightning effect applied to effect 4 sliders (luminocity, and R,G,B)
I think sampleimage is the way to go but its not quite working.
Any ideas would be appreciated!
Thanks and POWER TO THE COW!
Co-Director Podchains Ltd
Video Producer / Motion graphics designer https://bexmedia.net -
1 Reply
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Hi Craig, try this. It will sample the Lightning layer, using the current position of the layer that you apply the sliders (and the expressions) to:
//red slider
target = thisComp.layer("Lightning Layer");
colorValue = target.sampleImage(transform.position, radius = [.5, .5] );
outputValue = (colorValue * 255);
outputValue[0];//green slider
target = thisComp.layer("Lightning Layer");
colorValue = target.sampleImage(transform.position, radius = [.5, .5] );
outputValue = (colorValue * 255);
outputValue[1];//blue slider
target = thisComp.layer("Lightning Layer");
colorValue = target.sampleImage(transform.position, radius = [.5, .5] );
outputValue = (colorValue * 255);
outputValue[2];//alpha slider
target = thisComp.layer("Lightning Layer");
colorValue = target.sampleImage(transform.position, radius = [.5, .5] );
outputValue = (colorValue * 255);
outputValue[3];
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