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Noob question about ofPixels

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@jeromeh wrote:

I'm trying to get the color from an ofPixels object

ofPixels camPixels = cam.getPixels();
ofColor col = camPixels.getColor(x,y);

It works but I get this error in the log?

[warning] returning color not supported yet for UNKOWN format
[ error ] ofPixels: format doesn't support channels

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