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[cbiggin]

You have to create your new context at the dimensions of the photo, then draw into the new dimensions. Also, I don't think you need to push/pop the current context. Try this:

    CGFloat imageWidth = CGImageGetWidth([inImage CGImage]);
    CGFloat imageHeight = CGImageGetHeight([inImage CGImage]);
    UIGraphicsBeginImageContext(CGSizeMake(imageWidth, imageHeight));
    CGRect drawRect = CGRectMake(0, 0, 768, 1024);
    [inImage drawInRect:drawRect];
    newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();