69 lines
1.7 KiB
Python
69 lines
1.7 KiB
Python
# Convert png image to 256 palette image for Pokitto. Usage:
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#
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# python convert_png.py input_image.png palette_16x16_image.png
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#
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# The script will read the input PNG image (must be in RGB format, NOT
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# indexed), match each pixel to the closest color in the palette and output
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# the image to stdout as an array of bytes, by columns. It's best if the image
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# is made only of color of the palette as the closest match can sometimes look
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# different from what you imagined.
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#
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# The script will also create an image (out.png) of the converted image, so
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# that you can check how it looks.
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#
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# author: Miloslav Ciz
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# license: CC0
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import sys
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from PIL import Image
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def findClosest(pixel, palettePixels):
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result = 0
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closestDist = 255 * 255 * 255
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for i in range(256):
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p = palettePixels[i % 16,i / 16]
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d = abs(p[0] - pixel[0]) + abs(p[1] - pixel[1]) + abs(p[2] - pixel[2])
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if d < closestDist:
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result = i
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closestDist = d
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if d == 0:
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break
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return result
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image = Image.open(sys.argv[1])
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pixels = image.load()
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pal = Image.open(sys.argv[2])
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palPixels = pal.load()
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outImage = Image.new("RGB",(image.size[0],image.size[1]),"white")
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outPixels = outImage.load()
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sys.stdout.write("const unsigned char image[] =\n{ ")
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sys.stdout.write(str(image.size[0]) + ", " + str(image.size[1]) + " // width, height")
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count = 0
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for x in range(image.size[0]):
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for y in range(image.size[1]):
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if count % 14 == 0:
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sys.stdout.write("\n ");
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p = pixels[x,y]
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closest = findClosest(p,palPixels)
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sys.stdout.write(",0x{:02x}".format(closest))
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outPixels[x,y] = palPixels[closest % 16,closest / 16]
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count += 1
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print("\n};")
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outImage.save("out.png")
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