Hi,

I want to load an image and then cut a region of that loaded image (1) and turn 
it into another image (2).

I don't understand the s_offset, t_offset and r_offset convention. Can you 
explain me what that is? I've tried to Google it.

tl;dr...I think copySubImage is what I want, but I don't understand the 
parameters.

Thank you!

Cheers,
Johny

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