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Fix color for 7in3e 6 color panel #363

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Fix color for 7in3e 6 color panel #363

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23 changes: 15 additions & 8 deletions RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd7in3e.py
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Original file line number Diff line number Diff line change
Expand Up @@ -178,10 +178,17 @@ def init(self):
return 0

def getbuffer(self, image):
# Create a pallette with the 7 colors supported by the panel
# Black 0x0 000
# White 0x1 001
# Yellow 0x2 010
# Red 0x3 011
# Blue 0x5 101
# Green 0x6 110
color_map = [0, 1, 2, 3, 5, 6]

# Create a palette with the 6 colors supported by the panel
pal_image = Image.new("P", (1,1))
pal_image.putpalette( (0,0,0, 255,255,255, 0,255,0, 0,0,255, 255,0,0, 255,255,0) + (0,0,0)*250)
# pal_image.putpalette( (0,0,0, 255,255,255, 0,255,0, 0,0,255, 255,0,0, 255,255,0, 255,128,0) + (0,0,0)*249)
pal_image.putpalette( (0,0,0, 255,255,255, 255,255,0, 255,0,0, 0,0,255, 0,255,0) + (0,0,0)*250)

# Check if we need to rotate the image
imwidth, imheight = image.size
Expand All @@ -192,16 +199,16 @@ def getbuffer(self, image):
else:
logger.warning("Invalid image dimensions: %d x %d, expected %d x %d" % (imwidth, imheight, self.width, self.height))

# Convert the soruce image to the 7 colors, dithering if needed
image_7color = image_temp.convert("RGB").quantize(palette=pal_image)
buf_7color = bytearray(image_7color.tobytes('raw'))
# Convert the source image to the 6 colors, dithering if needed
image_6color = image_temp.convert("RGB").quantize(palette=pal_image)
buf_6color = bytearray(image_6color.tobytes('raw'))

# PIL does not support 4 bit color, so pack the 4 bits of color
# into a single byte to transfer to the panel
buf = [0x00] * int(self.width * self.height / 2)
idx = 0
for i in range(0, len(buf_7color), 2):
buf[idx] = (buf_7color[i] << 4) + buf_7color[i+1]
for i in range(0, len(buf_6color), 2):
buf[idx] = (color_map[buf_6color[i]] << 4) + color_map[buf_6color[i+1]]
idx += 1

return buf
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