How to control light intensity with brightness of a composition target?
Hey there, I am very new to expressions in after effects CC and fight with it.
I have a feeling it's really simple.
I use ambient light in a 3D room to simulate a glow of TV on the walls of the room.
I have already created a mock-up of the target, "TvContent", which represents the video plays on tv. To do this, I used the effect of mosaic on a 1 x 1 .mov file. Thus, every frame of "TvContent" is a solid color different, created from this image of the .mov file. I've matched the color of the ambient light with the color of the 'TvContent' model, but it takes an expression that target the BRIGHTNESS value of 'TvContent' to determine the intensity of ambient light.
Furthermore, I would like to than the intensity value to HALF the brightness value. It's... when "TvContent" brightness is 40%, I would like to the intensity of the light at 20%
I hope I explained that well.
Any help would be much appreciated.
Thanks in advance!
-Bryan
Answer to my own question here, but in the case where someone else needed a helping hand, that's what I was able to find/adapt (.. .five hours later):
target = thisComp.layer ("TvContent"); TvContent is the layer of film
SamplePoint = [20,20]; an arbitrary point since my model of the target is the same color
SampleSize = [1,1]; all pixels are of the same color so I need only a sample of a pixel
Lum = rgbToHsl (. 5 * target.sampleImage (samplepoint, samplesize)) [2];
linear (lum, 0, 1, 20, 80)
Thanks to Kevin and this forum 8 years on CreativeCOW
-Bryan
Tags: After Effects
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