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I am using CGColorSpaceCreateDeviceRGB() which returns a png image(pixel format)? Is there a way to save this image as a vector image. Basically I need to save the pictures drawn by the GLPaint application as a vector image.
I don’t know anything about this function or about GLPaint, but you can’t take a pixellized image and turn it into a vector image. Only humans and highly clever algorithms can do that ( see http://vectormagic.com/ )
If you have access to the input (gestures?) of GLPaint, you should convert them to SVG directly instead of passing through an RGB image.