image manipulation using slider in iphone

Question

Is there a way to apply brightness to uiimages. For example I have a UIImageview and inside that i have a uiimage. I want to manipulate its brightness with a help of UISlider wi

Answer 1

here is the code:-

        CGImageRef inImage = currentImage.CGImage;
        CFDataRef ref = CGDataProviderCopyData(CGImageGetDataProvider(inImage)); 
        UInt8 * buf = (UInt8 *) CFDataGetBytePtr(ref); 
        int length = CFDataGetLength(ref);
        float value2 =  (1+slider.value-0.5);
        NSLog(@"%i",value);
        for(int i=0; i

define this at the top:-

      #define SAFECOLOR(color) MIN(255,MAX(0,color))