Please guide how to set the mask image

Hi All,
i want to set camera images as a background of greeting image( those already in .png formate with white color background ), so when i am trying with following code in my app it is showing the color image in black and white color .
Please guide me how it is work.
I am using following code
-(UIImage)maskImage:(UIImage)image withMask:(UIImage*)mask {
CGImageRef imgRef = image CGImage;
CGImageRef maskRef = mask CGImage;
CGImageRef actualMask = CGImageMaskCreate(CGImageGetWidth(maskRef),
CGImageGetHeight(maskRef),
CGImageGetBitsPerComponent(maskRef),
CGImageGetBitsPerPixel(maskRef),
CGImageGetBytesPerRow(maskRef),
CGImageGetDataProvider(maskRef), NULL, false);
CGImageRef masked = CGImageCreateWithMask(imgRef, actualMask);
return UIImage imageWithCGImage:masked;
}

Hi,
Thank you for the reply.
My problem is related to Oracle Forms. So I go on Help ->Diagnostics ->custom code -> personalize. There I choose my field and PROMPT_TEXT property. But I do not know how to set it properly, so that it allows e.g. only numbers.
Please help me to solve this issue.
Thank you

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Hi,
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