I want to compute the alpha value of each pixel of an image.
What i am doing right now is i create a NSBitmapImageRep from the
image and use colorAtX: y: to get the alpha value form the color at
that pixel.
So i need to do this for each and every pixel in the image.
I was just going through the WWDC 2008's "916-Getting started with
Instruments" session where they worked on a sample image enhancement
app.
They had a similar case where they had to compute the color at every
pixel.
The author says the process can be optimized if we first gather the
imageRep's data and then access the color values directly from that data
So heres how i get the data:
unsigned char *data = [mImageRep bitmapData] , *pixel;
Now how do i access the pixel information from over here? any idea?
I'd be glad if someone can help me optimize this.
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