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sampleImage returns inaccurate result?
I’m playing around and stumbled upon this tutorial that uses greyness of a pixel to determine scale: https://www.youtube.com/watch?v=4OQN2mHQuD0
To get R value of a pixel it uses sampleImage() method. It samples the central point of a layer. I found it strange that even though the central point is still 100% black, scaling of a shape layer already occurred. Check this image at
t=9m26s
for example.
The expression in question:
sampleSize = [1,1];
samplePoint = thisComp.layer(“Control Layer”).transform.position; // it is [960,540]
sampleColor = thisComp.layer(“Control Layer”).sampleImage(sampleSize,samplePoint)[0];[sampleColor*100,sampleColor*100];
What am I missing here?
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1 Reply
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You simply switched the two arguments of the expression in sampleImage (just like the video did..)
It should be:sampleImage(position, radius), and in your case:
sampleColor = thisComp.layer(“Control Layer”).sampleImage(samplePoint, sampleSize)[0];
Hope it’s all clear.
Leopy
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