- (UIImage*) blankImage:(CGSize)targetSize
{
    UIImage *inputImage = [UIImage imageNamed:@"blank.png"];        // input image to be composited over new image as example

    // create a new bitmap image context

    NSLog(@"Draw Image Called %f %f", targetSize.width, targetSize.height);

    //
    UIGraphicsBeginImageContext(CGSizeMake(targetSize.width, targetSize.height));

    // get context
    //
    CGContextRef context = UIGraphicsGetCurrentContext();

    // push context to make it current
    // (need to do this manually because we are not drawing in a UIView)
    //
    UIGraphicsPushContext(context);

    // drawing code comes here- look at CGContext reference
    // for available operations
    //
    // this example draws the inputImage into the context
    //
    [inputImage drawInRect:CGRectMake(0, 0, targetSize.width, targetSize.height)];


    // pop context
    //
    UIGraphicsPopContext();

    // get a UIImage from the image context- enjoy!!!
    //
    UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();

    // clean up drawing environment
    //
    UIGraphicsEndImageContext();

    return outputImage;
}


- (void)getRGBComponents:(CGFloat [3])components forColor:(UIColor *)color {
    CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
    unsigned char resultingPixel[4];
    CGContextRef context = CGBitmapContextCreate(&resultingPixel,
                                                 1,
                                                 1,
                                                 8,
                                                 4,
                                                 rgbColorSpace,
                                                 kCGImageAlphaNoneSkipLast);
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, CGRectMake(0, 0, 1, 1));
    CGContextRelease(context);
    CGColorSpaceRelease(rgbColorSpace);

    for (int component = 0; component < 3; component++) {
        components[component] = resultingPixel[component] / 255.0f;
    }
}




-(UIImage*) drawQRImage
{

    NSLog(@"Draw Image Called %f %f", [theCanvas mySize].width, [theCanvas mySize].height);

    // load Image
    //
    //CGImageRef imageRef         = [self blankCGImage];


    UIImage *image              = [self blankImage:CGSizeMake([theCanvas mySize].width, [theCanvas mySize].height)];

    //UIImage *image = [UIImage imageNamed:@"blank.png"];
    CGImageRef imageRef         = image.CGImage;


    NSData *data                = (NSData *) CGDataProviderCopyData(CGImageGetDataProvider(imageRef));
    char *pixels                = (char *)[data bytes];

    //unsigned long int pixelNr;


    // manipulate the individual pixels
    //
    //size_t width                = [theCanvas mySize].width;
    //size_t height               = [theCanvas mySize].height;

    size_t width                = CGImageGetWidth(imageRef);
    size_t height                 = CGImageGetHeight(imageRef);



    for(int pixelNr = 0; pixelNr < width *  height; pixelNr++){

        int value = [[[[[theCanvas frames] objectAtIndex:currentFrame] bitvalues] objectAtIndex:pixelNr] intValue];

        UIColor *color = [[[theCanvas pallet] colors] objectAtIndex:value];

        CGFloat components[4];
        [self getRGBComponents:components forColor:color];
        //NSLog(@"%f %f %f", components[0], components[1], components[2]);



        int red                 = pixelNr*4;
        int green               = pixelNr*4+1;
        int blue                = pixelNr*4+2;
        int alpha               = 255;

        if(color == [UIColor clearColor]){

            components[0] = 1;
            components[1] = 1;
            components[2] = 1;
            alpha = 0;
        }


        // Set Pixel-Color Black
        //
        pixels[blue]         = components[0]*255;
        pixels[green]       = components[1]*255;
        pixels[red]        = components[2]*255;
        pixels[alpha]       = alpha;

        //NSLog(@"Bit Value: %d", value);

    }



    //
    // [...] deleted some unimportant code here
    //

    // create a new image from the modified pixel data
    //
    size_t bitsPerComponent     = CGImageGetBitsPerComponent(imageRef);
    size_t bitsPerPixel         = CGImageGetBitsPerPixel(imageRef);
    size_t bytesPerRow          = CGImageGetBytesPerRow(imageRef);


    //NSLog(@"bitsPerComponent:%f bitsPerPixel bytesPerRow)

    CGColorSpaceRef colorspace  = CGColorSpaceCreateDeviceRGB();
    CGBitmapInfo bitmapInfo     = CGImageGetBitmapInfo(imageRef);
    CGDataProviderRef provider  = CGDataProviderCreateWithData(NULL, pixels, [data length], NULL);

    CGImageRef newImageRef      = CGImageCreate (
                                                 width,
                                                 height,
                                                 bitsPerComponent,
                                                 bitsPerPixel,
                                                 bytesPerRow,
                                                 colorspace,
                                                 bitmapInfo,
                                                 provider,
                                                 NULL,
                                                 false,
                                                 kCGRenderingIntentDefault
                                                 );

    // the modified image
    //
    UIImage *newImage           = [UIImage imageWithCGImage:newImageRef];

    // cleanup
    //

    NSLog(@"Draw Image Processing");

    //free(pixels);
    //CGImageRelease(imageRef); // DO NOT RELEASE OR ON NEXT RUN NSData GETS EXC_BAD_ACCESS
    //CGColorSpaceRelease(colorspace);
    //CGDataProviderRelease(provider);
    //CGImageRelease(newImageRef);

    //QRcode_free(qrCode);
    //QRinput_free(input);

    // return created Image
    //
    NSLog(@"Draw Image Finished");

    return newImage;
}