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Fix epd7in3f Spectra 6 colors #411

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Fix epd7in3f Spectra 6 colors #411

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16 changes: 8 additions & 8 deletions RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd7in3f.py
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@glueckesa-stack glueckesa-stack Jan 7, 2026

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Does Somebody has colour problems with the 13,3inch Spektra 6 Panel, too? I dont get the Panel running in colour with the existing drivers :-(

Original file line number Diff line number Diff line change
Expand Up @@ -198,9 +198,10 @@ def init(self):
return 0

def getbuffer(self, image):
# Create a pallette with the 7 colors supported by the panel
# Create a palette with the 6 colors supported by the E6/Spectra 6 panel
# Black, White, Yellow, Red, Blue, Green (NO orange - hardware doesn't support it)
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, 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 @@ -211,16 +212,16 @@ 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] = (buf_6color[i] << 4) + buf_6color[i+1]
idx += 1

return buf
Expand All @@ -244,4 +245,3 @@ def sleep(self):
epdconfig.delay_ms(2000)
epdconfig.module_exit()
### END OF FILE ###