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If you don't want it continuously alternate between the two for some reason you can make the delay much bigger, and send a SIGUSR1 to feh ( os.kill(pid, signal.SIGUSR1)) to make it switch whenever you update the image. The images are swapped every 0.5 seconds, without flashing. All I'm trying to do is display an image using Pillow on Raspberry Pi 3 First tried using this code: from PIL import Image from PIL import ImageShow imageA Image.open ('Moth.png') ImageShow. If you remove the -title "monitor" from the feh command, you will see it is just iterating through a list of 2 images, that both happen to be the same image. In essence, all your application has to do is: while true: so that 'feh' cannot read a half-saved image # Save image to a temporary file, then rename in one immutable operation. # Select a random colour and draw a rectangleįill = (randint(0,255), randint(0,255), randint(0,255))ĭraw.rectangle(, fill=fill) # Select random top-left and bottom-right corners for image Tmpnam = os.path.join(os.path.dirname(filename), "tmp.ppm") # Create name of temp image in same directory # Create initial image and drawing handle Then the Python script monitor.py might look like this: #!/usr/bin/python3 # Now start Python script with image name Time-lapse photography uses multiple images taken over a long period of time, which are then. # Get 'feh' started in "Slideshow mode" in the backgroundįeh -title "Monitor" -D 0.5 "$IMGNAM" "$IMGNAM" & Learn how to setup a Pi Camera to take time-lapse pictures. # Create initial empty image to display with ImageMagick or any other meansĬonvert -size 800圆00 xc:black -depth 8 "$IMGNAM" Sudo mount -t tmpfs -o size=4M tmpfs /media/ramdisk 2> /dev/null Sudo mkdir -p /media/ramdisk 2> /dev/null The initial script might look like this: #!/bin/bash As it stands, I only know of 4 of them (display, convert, import, compare) and all of them I just found by accident. Then start a Python script updating your images. The IM tools follow the Unix model of just throwing everything into /usr/bin, and since the command names are generic (e.g., display), there's no good way to find if there is an IM tool that fits a new need. Sudo mount -t tmpfs -o size=4M tmpfs /media/ramdiskįilesystem 1K-blocks Used Available Use% Mounted on Write the image to that and display it with feh or similar: sudo mkdir -p /media/ramdisk Create a small RAMdisk which is nice and fast and avoids wear on your SD card.
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