mirror of
https://github.com/KrisKennaway/ii-pix.git
synced 2024-06-13 07:29:29 +00:00
ee2229d0ea
direction. Otherwise, errors can accumulate in an RGB channel if there are no palette colours with an extremal value, and then when we introduce a new palette the error all suddenly discharges in a spurious horizontal line. This now gives quite good results! * Switch to using L1-norm for k-means, per suggestion of Lucas Scharenbroich: "A k-medians effectively uses an L1 distance metric instead of L2 for k-means. Using a squared distance metric causes the fit to "fall off" too quickly and allows too many of the k centroids to cluster around areas of high density, which results in many similar colors being selected. A linear cost function forces the centroids to spread out since the error influence has a broader range."
204 lines
7.8 KiB
Python
204 lines
7.8 KiB
Python
"""Image converter to Apple II Double Hi-Res format."""
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import argparse
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import array
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import os.path
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import time
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import collections
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import random
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import colour
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from PIL import Image
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import numpy as np
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from sklearn.cluster import KMeans
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import dither as dither_pyx
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import dither_pattern
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import image as image_py
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import palette as palette_py
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import screen as screen_py
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# TODO:
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# - support LR/DLR
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# - support HGR
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def cluster_palette(image: Image):
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line_to_palette = {}
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#shuffle_lines = liprint(st(range(200))
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#random.shuffle(shuffle_lines)
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#for idx, line in enumerate(shuffle_lines):
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# line_to_palette[line] = idx % 16
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# for line in range(200):
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# if line % 3 == 0:
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# line_to_palette[line] = int(line / (200 / 16))
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# elif line % 3 == 1:
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# line_to_palette[line] = np.clip(int(line / (200 / 16)) + 1, 0, 15)
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# else:
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# line_to_palette[line] = np.clip(int(line / (200 / 16)) + 2, 0, 15)
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for line in range(200):
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if line % 3 == 0:
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line_to_palette[line] = int(line / (200 / 16))
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elif line % 3 == 1:
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line_to_palette[line] = np.clip(int(line / (200 / 16)) + 1, 0, 15)
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else:
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line_to_palette[line] = np.clip(int(line / (200 / 16)) + 2, 0, 15)
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colours_rgb = np.asarray(image).reshape((-1, 3))
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with colour.utilities.suppress_warnings(colour_usage_warnings=True):
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colours_cam = colour.convert(colours_rgb, "RGB",
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"CAM16UCS").astype(np.float32)
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palettes_rgb = {}
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palette_colours = collections.defaultdict(list)
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for line in range(200):
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palette = line_to_palette[line]
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palette_colours[palette].extend(
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colours_cam[line * 320:(line + 1) * 320])
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# For each line grouping, find big palette entries with minimal total
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# distance
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palette_cam = None
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for palette_idx in range(16):
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line_colours = palette_colours[palette_idx]
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#if palette_idx < 15:
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# line_colours += palette_colours[palette_idx + 1]
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# if palette_idx < 14:
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# line_colours += palette_colours[palette_idx + 2]
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# if palette_idx > 0:
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# fixed_centroids = palette_cam[:8, :]
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# else:
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fixed_centroids = None
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# print(np.array(line_colours), fixed_centroids)
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palette_cam = dither_pyx.k_means_with_fixed_centroids(16, np.array(
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line_colours), fixed_centroids=fixed_centroids, tolerance=1e-6)
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#kmeans = KMeans(n_clusters=16, max_iter=10000)
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#kmeans.fit_predict(line_colours)
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#palette_cam = kmeans.cluster_centers_
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with colour.utilities.suppress_warnings(colour_usage_warnings=True):
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palette_rgb = colour.convert(palette_cam, "CAM16UCS", "RGB")
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# SHR colour palette only uses 4-bit values
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palette_rgb = np.round(palette_rgb * 15) / 15
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palettes_rgb[palette_idx] = palette_rgb.astype(np.float32)
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# print(palettes_rgb)
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return palettes_rgb, line_to_palette
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument("input", type=str, help="Input image file to process.")
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parser.add_argument("output", type=str, help="Output file for converted "
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"Apple II image.")
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parser.add_argument(
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"--lookahead", type=int, default=8,
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help=("How many pixels to look ahead to compensate for NTSC colour "
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"artifacts (default: 8)"))
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parser.add_argument(
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'--dither', type=str, choices=list(dither_pattern.PATTERNS.keys()),
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default=dither_pattern.DEFAULT_PATTERN,
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help="Error distribution pattern to apply when dithering (default: "
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+ dither_pattern.DEFAULT_PATTERN + ")")
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parser.add_argument(
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'--show-input', action=argparse.BooleanOptionalAction, default=False,
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help="Whether to show the input image before conversion.")
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parser.add_argument(
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'--show-output', action=argparse.BooleanOptionalAction, default=True,
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help="Whether to show the output image after conversion.")
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parser.add_argument(
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'--palette', type=str, choices=list(set(palette_py.PALETTES.keys())),
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default=palette_py.DEFAULT_PALETTE,
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help='RGB colour palette to dither to. "ntsc" blends colours over 8 '
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'pixels and gives better image quality on targets that '
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'use/emulate NTSC, but can be substantially slower. Other '
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'palettes determine colours based on 4 pixel sequences '
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'(default: ' + palette_py.DEFAULT_PALETTE + ")")
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parser.add_argument(
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'--show-palette', type=str, choices=list(palette_py.PALETTES.keys()),
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help="RGB colour palette to use when --show_output (default: "
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"value of --palette)")
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parser.add_argument(
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'--verbose', action=argparse.BooleanOptionalAction,
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default=False, help="Show progress during conversion")
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parser.add_argument(
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'--gamma_correct', type=float, default=2.4,
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help='Gamma-correct image by this value (default: 2.4)'
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)
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args = parser.parse_args()
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if args.lookahead < 1:
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parser.error('--lookahead must be at least 1')
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# palette = palette_py.PALETTES[args.palette]()
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screen = screen_py.SHR320Screen()
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# Conversion matrix from RGB to CAM16UCS colour values. Indexed by
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# 24-bit RGB value
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rgb_to_cam16 = np.load("data/rgb_to_cam16ucs.npy")
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# Open and resize source image
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image = image_py.open(args.input)
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if args.show_input:
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image_py.resize(image, screen.X_RES, screen.Y_RES,
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srgb_output=False).show()
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rgb = np.array(
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image_py.resize(image, screen.X_RES, screen.Y_RES,
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gamma=args.gamma_correct, srgb_output=True)).astype(
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np.float32) / 255
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palettes_rgb, line_to_palette = cluster_palette(rgb)
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# print(palette_rgb)
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# screen.set_palette(0, (image_py.linear_to_srgb_array(palette_rgb) *
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# 15).astype(np.uint8))
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for i, p in palettes_rgb.items():
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screen.set_palette(i, (np.round(p * 15)).astype(np.uint8))
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output_4bit = dither_pyx.dither_shr(rgb, palettes_rgb, rgb_to_cam16,
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line_to_palette)
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screen.set_pixels(output_4bit)
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output_rgb = np.zeros((200, 320, 3), dtype=np.uint8)
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for i in range(200):
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screen.line_palette[i] = line_to_palette[i]
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output_rgb[i, :, :] = (
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palettes_rgb[line_to_palette[i]][
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output_4bit[i, :]] * 255).astype(np.uint8)
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output_srgb = image_py.linear_to_srgb(output_rgb).astype(np.uint8)
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# dither = dither_pattern.PATTERNS[args.dither]()
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# bitmap = dither_pyx.dither_image(
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# screen, rgb, dither, args.lookahead, args.verbose, rgb_to_cam16)
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# Show output image by rendering in target palette
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# output_palette_name = args.show_palette or args.palette
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# output_palette = palette_py.PALETTES[output_palette_name]()
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# output_screen = screen_py.DHGRScreen(output_palette)
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# if output_palette_name == "ntsc":
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# output_srgb = output_screen.bitmap_to_image_ntsc(bitmap)
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# else:
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# output_srgb = image_py.linear_to_srgb(
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# output_screen.bitmap_to_image_rgb(bitmap)).astype(np.uint8)
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out_image = image_py.resize(
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Image.fromarray(output_srgb), screen.X_RES, screen.Y_RES,
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srgb_output=False) # XXX true
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if args.show_output:
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out_image.show()
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# Save Double hi-res image
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outfile = os.path.join(os.path.splitext(args.output)[0] + "-preview.png")
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out_image.save(outfile, "PNG")
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screen.pack()
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# with open(args.output, "wb") as f:
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# f.write(bytes(screen.aux))
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# f.write(bytes(screen.main))
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with open(args.output, "wb") as f:
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f.write(bytes(screen.memory))
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if __name__ == "__main__":
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main()
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