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add new dither methods

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deng
2026-03-22 14:50:17 +08:00
parent 87eb022933
commit 45dbf7efc9
3 changed files with 232 additions and 106 deletions
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4
pyproject.toml
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@ -4,13 +4,13 @@ version = "0.1.0"
description = "Process images for Waveshare E6 display" description = "Process images for Waveshare E6 display"
readme = "README.md" readme = "README.md"
requires-python = ">=3.13" requires-python = ">=3.13"
dependencies = ["pillow>=12.1.1"] dependencies = ["numpy>=2.0", "pillow>=12.1.1"]
[dependency-groups] [dependency-groups]
dev = ["ruff"] dev = ["ruff"]
[tool.ruff] [tool.ruff]
line-length = 150 line-length = 180
target-version = "py313" target-version = "py313"
[tool.ruff.lint] [tool.ruff.lint]

264
src/new_convert.py
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@ -6,127 +6,199 @@
import argparse import argparse
from pathlib import Path from pathlib import Path
import numpy as np
from PIL import Image, ImageEnhance, ImageOps from PIL import Image, ImageEnhance, ImageOps
# E Ink Spectra 6 six basic ink colors: Black, White, Red, Green, Blue, Yellow
SPECTRA6_PALETTE = [ class EPaperConverter:
0, 0, 0, """Converts photos for Waveshare E-Paper (E Ink Spectra 6) display output."""
255, 255, 255,
255, 0, 0, # E Ink Spectra 6 palette: [R, G, B] triplets
0, 255, 0, SPECTRA6_COLORS = [
0, 0, 255, [0, 0, 0], # Black
255, 255, 0 [255, 255, 255], # White
[255, 0, 0], # Red
[0, 255, 0], # Green
[0, 0, 255], # Blue
[255, 255, 0], # Yellow
] ]
# Pad the palette to 256 colors (required by PIL), fill the rest with 0 BW_COLORS = [
SPECTRA6_PALETTE += [0] * (256 * 3 - len(SPECTRA6_PALETTE)) [0, 0, 0], # Black
[255, 255, 255], # White
]
# Optimization presets: {enhancement_attr: multiplier}
ENHANCE_PRESETS = {
'normal': {'brightness': 1.1, 'color': 1.5, 'contrast': 1.2, 'sharpness': 1.0},
'portrait': {'brightness': 1.2, 'color': 1.2, 'contrast': 1.05, 'sharpness': 1.0},
'landscape': {'brightness': 1.0, 'color': 1.8, 'contrast': 1.4, 'sharpness': 2.0},
}
def create_spectra_palette(): # Error diffusion kernels: list of (dy, dx, weight) tuples
"""Create a reference image with the Spectra 6 palette.""" DITHER_KERNELS = {
pal_img = Image.new('P', (1, 1)) 'atkinson': [
pal_img.putpalette(SPECTRA6_PALETTE) # * 1/8 1/8
return pal_img # 1/8 1/8 1/8
# 1/8
# Only diffuses 75% of error → preserves highlights, cleaner look
(0, 1, 1 / 8), (0, 2, 1 / 8),
(1, -1, 1 / 8), (1, 0, 1 / 8), (1, 1, 1 / 8),
(2, 0, 1 / 8),
],
'stucki': [
# * 8/42 4/42
# 2/42 4/42 8/42 4/42 2/42
# 1/42 2/42 4/42 2/42 1/42
# Largest diffusion area → smoothest gradients
(0, 1, 8 / 42), (0, 2, 4 / 42),
(1, -2, 2 / 42), (1, -1, 4 / 42), (1, 0, 8 / 42), (1, 1, 4 / 42), (1, 2, 2 / 42),
(2, -2, 1 / 42), (2, -1, 2 / 42), (2, 0, 4 / 42), (2, 1, 2 / 42), (2, 2, 1 / 42),
],
}
def __init__(self, width=800, height=480, color='rgb', mode='normal', dither='floyd-steinberg'):
self.width = width
self.height = height
self.color = color
self.mode = mode
self.dither = dither
def apply_epaper_gamma_correction(img, gamma=1.2): # -- Image enhancement ---------------------------------------------------
"""
Apply E-paper specific Gamma correction. def _apply_gamma_correction(self, img, gamma=1.3):
Since e-paper is non-emissive, dark areas tend to blend together. """Brighten midtones via gamma correction to compensate for e-paper's non-emissive display."""
This function brightens the midtones to rescue dark details.
"""
# Convert Gamma value to a lookup table for the PIL point function
inv_gamma = 1.0 / gamma inv_gamma = 1.0 / gamma
table = [int((i / 255.0) ** inv_gamma * 255) for i in range(256)] lut = [int((i / 255.0) ** inv_gamma * 255) for i in range(256)]
# Separate RGB channels and apply correction
if img.mode == 'RGB':
r, g, b = img.split() r, g, b = img.split()
r = r.point(table) return Image.merge('RGB', (r.point(lut), g.point(lut), b.point(lut)))
g = g.point(table)
b = b.point(table)
return Image.merge('RGB', (r, g, b))
return img.point(table)
def optimize_image(img, mode):
"""Apply extreme color compensation based on the selected mode to offset physical e-paper attenuation."""
# Apply base Gamma brightening for all color images before conversion
img = apply_epaper_gamma_correction(img, gamma=1.3)
if mode == 'normal':
# Normal mode: Boost saturation and contrast globally
img = ImageEnhance.Color(img).enhance(1.5) # Significantly increase vibrance
img = ImageEnhance.Contrast(img).enhance(1.2) # Strengthen light/dark contrast
img = ImageEnhance.Brightness(img).enhance(1.1) # Slightly brighten overall
elif mode == 'portrait':
# Portrait mode: Protect skin tones. Brighten faces, but limit saturation.
img = ImageEnhance.Brightness(img).enhance(1.2) # Faces must be bright enough
img = ImageEnhance.Color(img).enhance(1.2) # Moderately increase color
img = ImageEnhance.Contrast(img).enhance(1.05) # Maintain soft transitions
elif mode == 'landscape':
# Landscape mode: Maximize greens, blues, and 3D depth
img = ImageEnhance.Color(img).enhance(1.8) # Extreme vibrance for mountains and skies
img = ImageEnhance.Contrast(img).enhance(1.4) # Strong contrast for ridges and clouds
img = ImageEnhance.Sharpness(img).enhance(2.0) # Sharpen edge details
def _optimize(self, img):
"""Apply gamma correction and preset-based enhancement for e-paper output."""
img = self._apply_gamma_correction(img)
preset = self.ENHANCE_PRESETS[self.mode]
for attr, factor in preset.items():
if factor != 1.0:
enhancer_cls = getattr(ImageEnhance, attr.capitalize())
img = enhancer_cls(img).enhance(factor)
return img return img
# -- Dithering -----------------------------------------------------------
def main(): def _build_pil_palette(self, colors):
parser = argparse.ArgumentParser(description='Spectra 6 E-Paper Image Conversion Engine') """Build a PIL palette image from a list of [R, G, B] triplets."""
parser.add_argument('--img_path', type=str, required=True, help='Path to the original photo (e.g., my_photo.jpg)') flat = [v for rgb in colors for v in rgb]
parser.add_argument( flat += [0] * (256 * 3 - len(flat))
'--color', type=str, choices=['rgb', 'bw'], required=True, help="Color mode: 'rgb' (Full color Spectra 6) or 'bw' (Pure black and white)" pal_img = Image.new('P', (1, 1))
) pal_img.putpalette(flat)
parser.add_argument( return pal_img
'--mode',
type=str,
choices=['normal', 'portrait', 'landscape'],
default='normal',
help="Optimization mode: 'normal', 'portrait', 'landscape'. Ignored if color is 'bw'.",
)
parser.add_argument('--width', type=int, default=800, help='E-paper width (default: 800)')
parser.add_argument('--height', type=int, default=480, help='E-paper height (default: 480)')
parser.add_argument('--out', type=str, default=None, help='Custom output filename (default: auto-generated)')
args = parser.parse_args() def _error_diffusion_dither(self, img, palette_colors):
"""Apply custom error diffusion dithering (atkinson / stucki) using NumPy."""
kernel = self.DITHER_KERNELS[self.dither]
palette = np.array(palette_colors, dtype=np.float64)
pixels = np.array(img, dtype=np.float64)
h, w, _ = pixels.shape
img_path = Path(args.img_path) for y in range(h):
for x in range(w):
old_pixel = pixels[y, x].copy()
distances = np.sum((palette - old_pixel) ** 2, axis=1)
new_pixel = palette[np.argmin(distances)]
pixels[y, x] = new_pixel
error = old_pixel - new_pixel
for dy, dx, weight in kernel:
ny, nx = y + dy, x + dx
if 0 <= ny < h and 0 <= nx < w:
pixels[ny, nx] += error * weight
return Image.fromarray(np.clip(pixels, 0, 255).astype(np.uint8), 'RGB')
def _dither_rgb(self, img):
"""Quantize an RGB image to the Spectra 6 palette."""
if self.dither == 'floyd-steinberg':
pal_img = self._build_pil_palette(self.SPECTRA6_COLORS)
return img.quantize(palette=pal_img, dither=Image.FLOYDSTEINBERG).convert('RGB')
return self._error_diffusion_dither(img, self.SPECTRA6_COLORS)
def _dither_bw(self, img):
"""Convert an image to black and white with dithering."""
img = ImageEnhance.Contrast(img).enhance(1.5)
if self.dither == 'floyd-steinberg':
return img.convert('1').convert('RGB')
return self._error_diffusion_dither(img, self.BW_COLORS)
# -- Public API ----------------------------------------------------------
def convert(self, img_path, output_path=None):
"""
Main conversion pipeline: load → resize → enhance → dither → save.
Args:
img_path: Path to the source image.
output_path: Optional output path. Auto-generated if None.
Returns:
Path to the saved output file.
"""
img_path = Path(img_path)
if not img_path.exists(): if not img_path.exists():
raise FileNotFoundError(f'Error: Image file not found: {img_path}') raise FileNotFoundError(f'Image file not found: {img_path}')
print(f'Processing: {img_path}') print(f'Processing: {img_path}')
img = Image.open(img_path).convert('RGB') img = Image.open(img_path).convert('RGB')
# 1. Smart crop and resize to fill the frame # Resize to fit the e-paper frame
img = ImageOps.fit(img, (args.width, args.height), Image.Resampling.LANCZOS) img = ImageOps.fit(img, (self.width, self.height), Image.Resampling.LANCZOS)
# Generate automatic filename if not provided # Enhance and dither
output_name = Path(args.out) if args.out else img_path.with_name(f'{img_path.stem}_{args.color}_{args.mode}.bmp') print(f'Color: {self.color} | Mode: {self.mode} | Dither: {self.dither}')
if self.color == 'rgb':
img = self._optimize(img)
final_img = self._dither_rgb(img)
else:
final_img = self._dither_bw(img)
# 2. Core conversion logic # Save as 24-bit RGB BMP (required by Waveshare e-paper frames)
if args.color == 'rgb': if output_path is None:
print(f'Applying color optimization mode: {args.mode}') output_path = img_path.with_name(f'{img_path.stem}_{self.color}_{self.mode}_{self.dither}.bmp')
img_optimized = optimize_image(img, args.mode) else:
pal_img = create_spectra_palette() output_path = Path(output_path)
# Convert and apply Floyd-Steinberg dithering, then back to 24-bit RGB
# Waveshare e-paper frames only recognize 24-bit RGB BMP files
final_img = img_optimized.quantize(palette=pal_img, dither=Image.FLOYDSTEINBERG).convert('RGB')
elif args.color == 'bw': final_img.save(output_path)
print(f'Applying pure black and white mode (ignoring optimization mode: {args.mode})') print(f'Saved: {output_path}')
# Black and white mode only needs basic contrast stretching return output_path
img_bw = ImageEnhance.Contrast(img).enhance(1.5)
final_img = img_bw.convert('1').convert('RGB')
# 3. Save file (24-bit RGB BMP, required by Waveshare e-paper frames)
final_img.save(output_name) # ---------------------------------------------------------------------------
print(f'Success! Image saved as: {output_name}') # CLI
# ---------------------------------------------------------------------------
def build_parser():
"""Build and return the argument parser."""
parser = argparse.ArgumentParser(description='Spectra 6 E-Paper Image Conversion Engine')
parser.add_argument('--img_path', type=str, required=True, help='Path to the original photo')
parser.add_argument('--color', type=str, choices=['rgb', 'bw'], required=True, help="'rgb' (Spectra 6) or 'bw' (pure black and white)")
parser.add_argument('--mode', type=str, choices=['normal', 'portrait', 'landscape'], default='normal', help='Optimization preset (default: normal)')
parser.add_argument('--dither', type=str, choices=['floyd-steinberg', 'atkinson', 'stucki'], default='floyd-steinberg', help='Dithering algorithm (default: floyd-steinberg)')
parser.add_argument('--width', type=int, default=800, help='E-paper width (default: 800)')
parser.add_argument('--height', type=int, default=480, help='E-paper height (default: 480)')
parser.add_argument('--out', type=str, default=None, help='Custom output filename')
return parser
def main():
args = build_parser().parse_args()
converter = EPaperConverter(
width=args.width,
height=args.height,
color=args.color,
mode=args.mode,
dither=args.dither,
)
converter.convert(args.img_path, output_path=args.out)
if __name__ == '__main__': if __name__ == '__main__':

56
uv.lock generated
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@ -2,6 +2,56 @@ version = 1
revision = 3 revision = 3
requires-python = ">=3.13" requires-python = ">=3.13"
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[[package]] [[package]]
name = "pillow" name = "pillow"
version = "12.1.1" version = "12.1.1"
@ -90,6 +140,7 @@ name = "waveshare-e6-image-processor"
version = "0.1.0" version = "0.1.0"
source = { virtual = "." } source = { virtual = "." }
dependencies = [ dependencies = [
{ name = "numpy" },
{ name = "pillow" }, { name = "pillow" },
] ]
@ -99,7 +150,10 @@ dev = [
] ]
[package.metadata] [package.metadata]
requires-dist = [{ name = "pillow", specifier = ">=12.1.1" }] requires-dist = [
{ name = "numpy", specifier = ">=2.0" },
{ name = "pillow", specifier = ">=12.1.1" },
]
[package.metadata.requires-dev] [package.metadata.requires-dev]
dev = [{ name = "ruff" }] dev = [{ name = "ruff" }]