[Tutor] Saving an Image in a Given Format

Wayne Watson sierra_mtnview at sbcglobal.net
Sat Mar 29 13:27:36 CET 2008

I'm pretty new to Python and libraries. I'm actually trying to modify 
some code someone else wrote. There are two ways images are saved. One 
is for the user to select a "Save as GIF" menu item, or save as tiff, or 
others. The other way is that the user wants a collected image from a 
camera saved every, say, 10 minutes. The "save" process is different for 
some reason. Here are the two code segments involved (NOTE my comments 
and questions below B.):

A. Save every 10 minutes
        t = time.localtime(now_time)
        s = "a%4d%02d%02d_%02d%02d%02d.tif" % (  
            t.tm_year, t.tm_mon, t.tm_mday,
            t.tm_hour, t.tm_min, t.tm_sec )
        s = os.path.join("Exposures",s)   <========== auto-exposures
        if not os.path.exists("Exposures"):
        self.current_image.save(s)  <============ save image
        if self.trigger_mode:

contrast this with where the user specifically wants the image he sees 
saved as a gif:

B. From menu option

def SaveGIF(self):
        if self.current_path:
            default_path = splitext(basename(self.current_path))[0] + 
            path = asksaveasfilename(defaultextension=".gif",
                                     title="Save as GIF",
            path = asksaveasfilename(defaultextension=".gif",
                                     title="Save as GIF",
        if not path:
        gif = self.current_image.convert("RGB")
        gif.save(path) <===========Save as gif.

The programmer told me if I change the tif in A. to gif, jpg or 
whatever, it would work. Instead I get a file the of zero length when I 
use jpg. Can anyone explain why this wouldn't work? I see that 
current_image.convert is involved in one place and current_image.save in 
the first. What module owns these "current" methods?

Hmmm, maybe I needed to use jpeg?

           Wayne Watson (Watson Adventures, Prop., Nevada City, CA)

             (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
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            "The only laws of matter are those which our minds must
             fabricate, and the only laws of mind are fabricated
             for it by matter." -- James Clerk Maxwell
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