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Attempt to fix waveshare orange color #511

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kinto0 wants to merge 2 commits into from
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Attempt to fix waveshare orange color #511

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45d59b1
Improve Waveshare bi-color display rendering with extended palette
kinto0 Jan 7, 2026
54f149b
use only correct colors
kinto0 Jan 7, 2026
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28 changes: 27 additions & 1 deletion src/display/waveshare_display.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,30 @@ def split_image_for_bi_color_epd(image):
return black_layer, red_layer


def quantize_for_color_epd(image):
"""
Quantize image with correct palette for E6 (Spectra 6) full-color e-paper displays.

E6 displays support 6 colors: black, white, red, yellow, green, blue (no orange).
Using the exact hardware color palette reduces dithering artifacts and blotchy text.
"""
black = (0, 0, 0)
white = (255, 255, 255)
red = (255, 0, 0)
yellow = (255, 255, 0)
green = (0, 255, 0)
blue = (0, 0, 255)

# E6/Spectra 6 palette: 6 colors (black, white, red, yellow, green, blue)
palette_data = [*black, *white, *red, *yellow, *green, *blue]
palette_img = Image.new('P', (1, 1))
palette_img.putpalette(palette_data)

# Quantize to hardware-supported colors - reduces dithering
return image.quantize(palette=palette_img, dither=Image.Dither.FLOYDSTEINBERG).convert('RGB')



class WaveshareDisplay(AbstractDisplay):
"""
Handles Waveshare e-paper display dynamically based on device type.
Expand Down Expand Up @@ -129,7 +153,9 @@ def display_image(self, image, image_settings=[]):

# Display the image on the WS display.
if not self.bi_color_display:
self.epd_display.display(self.epd_display.getbuffer(image))
# Apply extended palette quantization for full-color displays
quantized_image = quantize_for_color_epd(image)
self.epd_display.display(self.epd_display.getbuffer(quantized_image))
else:
black_layer, red_layer = split_image_for_bi_color_epd(image)

Expand Down