How to save raster to file from canvas

[Hsuan Chang]

>I'd like some advice with what seems like a simple idea.  Given a canvas
>with its pixwin, how can I just get at the raw bits of the image so as to
>save it to a disk file and later reload it into the same pixwin?  Note
>that the rectangle size and shape will not change.

Well, you might want to use the pixrect substructure of the pixwin
directly.  It's accessable via pw->pw_prretained, which is a pointer to a
pixrect structure.  It has everything that you have on the canvas.  You
can then go in to access the raw data part (one dimensional array of type
*short*, each holding two pixels of 8 bits each).

Hope this helps.

Hsuan Chang               hsc at vuse.vanderbilt.edu
Image Processing Lab, Computer Science Department
Vanderbilt University, Nashville, Tn 37235