how i can scale a image from a opengl view

I can save a image from a view, but i don’t know scale this image to select the size

What sort of image… bitmapped or Postscript? Are you trying to scale it before you output, or trying to find a utility to do it afterwords.

Assuming that you are using bitmaps and are trying to do this in your own code, I think you need to change the size of the buffer you are rendering into. If you’re using Postscript, just insert a /scale command (I think that’s the one I’m thinking of…)