objective c: save image pixel RGB values to Array

I'm trying some experimental imagestuff on ipad and I'm trying to store every pixel's colordata into one array to increase performance for reading every pixel colordata,

right now I have a timer that calls my DrawRect as much as possible, in my DrawRect function I have this:

-(void)drawRect:(CGRect)rect
{
    UIGraphicsBeginImageContext(self.frame.size);
    [currentImage.image drawInRect:CGRectMake(0, 0, 768, 1004)];
    CGContextSetLineWidth(UIGraphicsGetCurren开发者_如何转开发tContext(), 0.3);  

    r_x = r_x + 1;

    if (r_x == 768) {
        r_x = 1;
        r_y = r_y + 1;
    }
    if (r_y == 1004) {
        NSLog(@"color = %@", mijnArray_kleur);
    }
    CGPoint point2_1 = CGPointMake(r_x, r_y);
    GetColor *mycolor = [GetColor alloc];
    UIColor *st = [mycolor getPixelColorAtLocation:point2_1];
    [mijnArray_kleur addObject:st];
    [mycolor release];
    CGContextSetFillColorWithColor(UIGraphicsGetCurrentContext(), [st CGColor]);

    CGContextFillRect(UIGraphicsGetCurrentContext(), CGRectMake(r_x,r_y,1,1));
}

and getPixelColorAtLocation is a custom class that returns the UIDeviceRGBColorSpace values of a pixel

with this it takes me about 4 hours (yes, hours :p) to complete one image, is there anything faster/improvements?

Thanks!

Thys

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[Copied from comment for clarity] Not that I know objective C, at all, but it seems to me like your function iterates over 768 * 1004 values and thus draws that many rectangles. Guessing about 60 frames/second, this would take 3h 40min. Am I wrong here?