Add auto dither to what.

examples/7color/image.py

@@ -1,25 +1,35 @@
 #!/usr/bin/env python3
 
+import argparse
+import pathlib
 import sys
 
 from PIL import Image
 
 from inky.auto import auto
 
+parser = argparse.ArgumentParser()
+
+parser.add_argument("--saturation", "-s", type=float, default=0.5, help="Colour palette saturation")
+parser.add_argument("--file", "-f", type=pathlib.Path, help="Image file")
+
 inky = auto(ask_user=True, verbose=True)
-saturation = 0.5
 
-if len(sys.argv) == 1:
-    print("""
-Usage: {file} image-file
-""".format(file=sys.argv[0]))
+args, _ = parser.parse_known_args()
+
+saturation = args.saturation
+
+if not args.file:
+    print(f"""Usage:
+    {sys.argv[0]} --file image.png (--saturation 0.5)""")
     sys.exit(1)
 
-image = Image.open(sys.argv[1])
+image = Image.open(args.file)
 resizedimage = image.resize(inky.resolution)
 
-if len(sys.argv) > 2:
-    saturation = float(sys.argv[2])
+try:
+    inky.set_image(resizedimage, saturation=saturation)
+except TypeError:
+    inky.set_image(resizedimage)
 
-inky.set_image(resizedimage, saturation=saturation)
 inky.show()

inky/inky_ssd1608.py

@@ -261,9 +261,21 @@ def set_border(self, colour):
 
     def set_image(self, image):
         """Copy an image to the display."""
-        canvas = Image.new("P", (self.rows, self.cols))
-        canvas.paste(image, (self.offset_x, self.offset_y))
-        self.buf = numpy.array(canvas, dtype=numpy.uint8).reshape((self.cols, self.rows))
+        if not image.mode == "P":
+            palette_image = Image.new("P", (1, 1))
+            r, g, b = 0, 0, 0
+            if self.colour == "red":
+                r = 255
+            if self.colour == "yellow":
+                g = 255
+            palette_image.putpalette([255, 255, 255, 0, 0, 0, r, g, b] + [0, 0, 0] * 252)
+            image.load()
+            image = image.im.convert("P", True, palette_image.im)
+
+        canvas = Image.new("P", (self.cols, self.rows))
+        width, height = image.size
+        canvas.paste(image, (self.offset_x, self.offset_y, width, height))
+        self.buf = numpy.array(canvas, dtype=numpy.uint8).reshape((self.rows, self.cols))
 
     def _spi_write(self, dc, values):
         """Write values over SPI.

inky/inky_ssd1683.py

@@ -249,8 +249,20 @@ def set_border(self, colour):
 
     def set_image(self, image):
         """Copy an image to the display."""
+        if not image.mode == "P":
+            palette_image = Image.new("P", (1, 1))
+            r, g, b = 0, 0, 0
+            if self.colour == "red":
+                r = 255
+            if self.colour == "yellow":
+                g = 255
+            palette_image.putpalette([255, 255, 255, 0, 0, 0, r, g, b] + [0, 0, 0] * 252)
+            image.load()
+            image = image.im.convert("P", True, palette_image.im)
+
         canvas = Image.new("P", (self.cols, self.rows))
-        canvas.paste(image, (self.offset_x, self.offset_y))
+        width, height = image.size
+        canvas.paste(image, (self.offset_x, self.offset_y, width, height))
         self.buf = numpy.array(canvas, dtype=numpy.uint8).reshape((self.rows, self.cols))
 
     def _spi_write(self, dc, values):