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animoplex/SampleLumaValue.jsx

Last active March 30, 2023 12:26
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Sample Luminance Value - After Effects Expression by Animoplex
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SampleLumaValue.jsx
// Sample Luminance Value - Created by Animoplex: www.animoplex.com
// Samples the luma value of a defined area and converts to a specified value within a range.
// Use samplePoint to specify luma location
// Use sampleSize to adjust the sample area
// Last line: 0 - 1 is input, 0 - 100 is output
// Full Tutorial: https://www.youtube.com/watch?v=QkqiaPZJa1Y&t=62s
target = comp("SOURCE COMP").layer("SOURCE LAYER");
samplePoint= [960,540]; // Sample location
sampleSize= [50,50]; // Sample area (in pixels)
lum = rgbToHsl(target.sampleImage(samplePoint,sampleSize))[2];
linear(lum, 0, 1, 0, 100)
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