Fixed red/green color issue in indexed.py and added an example and image

to show the complete color wheel.

Author: DavePutz

adafruit_imageload/bmp/indexed.py

@@ -47,7 +47,10 @@ def load(file, width, height, data_start, colors, color_depth, *, bitmap=None, p
 
         file.seek(data_start - colors * 4)
         for value in range(colors):
-            palette[value] = file.read(4)
+            c = file.read(4)
+            # Need to swap red & green bytes (bytes 0 and 2)
+            d = bytes(b''.join([c[2:3],c[1:2],c[0:1],c[3:1]]))
+            palette[value] = d
 
     if bitmap:
         minimum_color_depth = 1

examples/code.py

@@ -0,0 +1,15 @@
+import board
+import displayio
+import adafruit_imageload
+
+display = board.DISPLAY
+
+bitmap, palette = adafruit_imageload.load("images/color_wheel.bmp", bitmap=displayio.Bitmap, palette=displayio.Palette)
+
+tile_grid = displayio.TileGrid(bitmap, pixel_shader=palette)
+
+group = displayio.Group()
+group.append(tile_grid)
+display.show(group)
+while True:
+	pass

examples/imageload_colorwheel.py

@@ -0,0 +1,15 @@
+import board
+import displayio
+import adafruit_imageload
+
+display = board.DISPLAY
+
+bitmap, palette = adafruit_imageload.load("images/color_wheel.bmp", bitmap=displayio.Bitmap, palette=displayio.Palette)
+
+tile_grid = displayio.TileGrid(bitmap, pixel_shader=palette)
+
+group = displayio.Group()
+group.append(tile_grid)
+display.show(group)
+while True:
+	pass