Paul St George wrote: > Thank you. > You are very right. The show() method is intended for debugging purposes > and is useful for that, but what method should I be using and is PIL the > best imaging library for my purposes? I do not want to manipulate > images, I only want to show images (full screen) on an external display. > I want to use Python to control the timing of the images. > > And, out of curiosity, as I will probably use a different method - how > do I find out what commands can be used as parameters for show()? I read > the docs at > <https://pillow.readthedocs.io/en/5.1.x/reference/Image.html > #PIL.Image.Image.show>, > but I am none the wiser.
If you look into the source code https://github.com/python-pillow/Pillow/blob/master/src/PIL/Image.py#L1967 after a few indirections show --> _show --> _showxv --> ImageShow.show you will end up in the file https://github.com/python-pillow/Pillow/blob/master/src/PIL/ImageShow.py which is short enough to read completely ;) At first glance it looks like the command argument is silently discarded, so here's plan B: It turns out that you can register() Viewer instances, and the pre- registered viewers for unixoids -- and thus probably the Pi are DisplayViewer and XVViewer. Using these as a template I came up with the following simple viewer that shows an image with firefox: #!/usr/bin/env python3 import os import sys from PIL import Image, ImageShow class Firefox(ImageShow.UnixViewer): # store the image in a format understood by the browser format = "jpeg" def get_command_ex(self, file, **options): return ("firefox",) * 2 def show_file(self, file, **options): quote = ImageShow.quote command, executable = self.get_command_ex(file, **options) # firefox returns immediately, so let's sleep a few seconds # to give it time to actually open the image file command = "(%s %s; sleep 10; rm -f %s)&" % ( command, quote("file://" + file), quote(file) ) os.system(command) return 1 # the -1 means our viewer will be inserted before the others # and thus become the default ImageShow.register(Firefox(), -1) if __name__ == "__main__": try: file = sys.argv[1] except IndexError: print("Please provide an image file", file=sys.stderr) else: image = Image.open(file) image.show() Here's another, even simpler one: class Gwenview(ImageShow.UnixViewer): def get_command_ex(self, file, **options): return ("gwenview",) * 2 -- https://mail.python.org/mailman/listinfo/python-list
