PImage img;

size(200,200);
//size(200,200, P3D); //this works correctly

img = loadImage("paint.jpg"); //load your own jpeg please
image(img, 0, 0);
copy(15, 25, 10, 10, 35, 25, 50, 50); //copying a 10x10 area to a 50x50 area...

For some reason when in P2D mode, copy() draws the non-scaled copied pixels
ON TOP of the scaled version...so you'll see a pixelated region(b/c it's
been scaled up) and the non-scaled version in the upperleft hand corner of
the pixelated region.

could you post the actual sketch that shows this? specifically, the code
below with the paint.jpg file that you're using so i can test it out? use
tools -> archive sketch to make a zip file, and then attach it to the bug
report. thanks.

edit]
My code and .jpg for the bug I'm describing.

k, i'll look into this, thanks for posting the sketch.

fwiw, it affects JAVA2D mode--P2D doesn't exist yet.

found and fixed for 0124. a silly error in PGraphicsJava2D. thanks for the
demo sketch.