I can't work it out either, but oyu may be able to use the following techique to draw straight to a bitmap-dc which you can save. - I can't remember where I found this; #lang scheme/gui (let ((bitmap (make-object bitmap% 255 255)) (dc (make-object bitmap-dc%)) (red-amount 150) (image-file "test.jpg")) (send dc set-bitmap bitmap) ;; do some drawing (do ((x 0 (+ x 1))) ((>= x 255)) (do ((y 0 (+ y 1))) ((>= y 255)) (send dc set-pixel x y (make-object color% x y 50) )) ) ;; (when (file-exists? image-file) (delete-file image-file)) ;; this bit saves the canvas (send bitmap save-file image-file 'jpeg 100) (display image-file) (display (current-directory)) ) <div class="gmail_quote">2009/5/14 Scott Brown <<a href="mailto:sukottoburaun@yahoo.co.jp">sukottoburaun@yahoo.co.jp</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">I have created a turtle module which draws pictures using a canvas% object and the draw-line method of dc from the PLT Graphics Toolkit. Is there some way to save pictures drawn to canvas% as image files? <div class="hm"> -------------------------------------- Power up the Internet with Yahoo! Toolbar. <a href="http://pr.mail.yahoo.co.jp/toolbar/" target="_blank">http://pr.mail.yahoo.co.jp/toolbar/</a> _________________________________________________ For list-related administrative tasks: <a href="http://list.cs.brown.edu/mailman/listinfo/plt-scheme" target="_blank">http://list.cs.brown.edu/mailman/listinfo/plt-scheme</a> </div></blockquote></div> -- -- Stephen De Gabrielle <a href="mailto:stephen.degabrielle@acm.org">stephen.degabrielle@acm.org</a> Telephone +44 (0)20 85670911 Mobile +44 (0)79 85189045 <a href="http://www.degabrielle.name/stephen">http://www.degabrielle.name/stephen</a>