How to get color from specific pixel in imageview in iOS

+ (UIColor*) getPixelColorAtLocation:(CGPoint)point myImage:(UIImage *)image {

    UIColor* color = nil;

    CGImageRef inImage = image.CGImage;

    // Create off screen bitmap context to draw the image into. Format ARGB is 4 bytes for each pixel: Alpa, Red, Green, Blue

    CGContextRef cgctx = [self createARGBBitmapContextFromImage:inImage];

    if (cgctx == NULL) { return nil; /* error */ }

    

    size_t w = CGImageGetWidth(inImage);

    size_t h = CGImageGetHeight(inImage);

    CGRect rect = {{0,0},{w,h}};

    

    // Draw the image to the bitmap context. Once we draw, the memory

    // allocated for the context for rendering will then contain the

    // raw image data in the specified color space.

    CGContextDrawImage(cgctx, rect, inImage);

    

    // Now we can get a pointer to the image data associated with the bitmap

    // context.

    unsigned char* data = CGBitmapContextGetData (cgctx);

    if (data != NULL) {

        //offset locates the pixel in the data from x,y.

        //4 for 4 bytes of data per pixel, w is width of one row of data.

        int offset = 4*((w*round(point.y))+round(point.x));

        int alpha =  data[offset];

        int red = data[offset+1];

        int green = data[offset+2];

        int blue = data[offset+3];

        //NSLog(@"offset: %i colors: RGB A %i %i %i  %i",offset,red,green,blue,alpha);

        color = [UIColor colorWithRed:(red/255.0f) green:(green/255.0f) blue:(blue/255.0f)alpha:(alpha/255.0f)];

    }

    

    // When finished, release the context

    CGContextRelease(cgctx);

    // Free image data memory for the context

    if (data) { free(data); }

    

    return color;

}