I am working on a Computer Vision project that uses real-time image
processing. I am grabbing frames using QTKit, then converting the
resulting CVImageBufferRef into a CIImage, and then converting that
into an NSBitmapImageRep. I know that my resulting NSBitmapImageRep is
fine, since I am viewing it by sticking it in an NSImage and then
popping that into an NSImageView (the QTKit Capture Preview has a 1/2
second lag time - which is unacceptable for this project). Everything
works as it should, but when I go to grab the raw pixel data from the
NSBitmapImageRep like so:
unsigned char *bitmapData = [self bitmapData];
(btw it says "self" because this is from a category of NSBitmapImageRep)
The resulting array, bitmapData, is an array of zeroes! Every pixel
sample in bitmapData is zero, yet I can draw the image and the image
IS there. What's going on? Any suggestions as to what I may be
overlooking?
Thanks in advance,
Nick Forge
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