[277] | 1 | #! /usr/bin/env python |
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| 2 | # -*- coding: ISO-8859-15 -*- |
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| 3 | # |
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| 4 | # pkpgcounter : a generic Page Description Language parser |
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| 5 | # |
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| 6 | # (c) 2003, 2004, 2005 Jerome Alet <alet@librelogiciel.com> |
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| 7 | # This program is free software; you can redistribute it and/or modify |
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| 8 | # it under the terms of the GNU General Public License as published by |
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| 9 | # the Free Software Foundation; either version 2 of the License, or |
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| 10 | # (at your option) any later version. |
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| 11 | # |
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| 12 | # This program is distributed in the hope that it will be useful, |
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| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | # GNU General Public License for more details. |
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| 16 | # |
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| 17 | # You should have received a copy of the GNU General Public License |
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| 18 | # along with this program; if not, write to the Free Software |
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| 19 | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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| 20 | # |
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| 21 | # $Id$ |
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| 22 | # |
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| 23 | |
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| 24 | import sys |
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| 25 | |
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| 26 | from PIL import Image |
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| 27 | |
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| 28 | """ RGB to CMYK formula : |
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| 29 | |
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| 30 | Black = min(1 - r, 1 - g, 1 - b) |
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| 31 | Cyan = (1 - r - Black) / (1 - Black) |
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| 32 | Magenta = (1 - g - Black) / (1 - Black) |
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| 33 | Yellow = (1 - b - Black) / (1 - Black) |
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| 34 | """ |
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| 35 | |
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[279] | 36 | def getPercentCMY(img, nbpix) : |
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[277] | 37 | result = [] |
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| 38 | (r, g, b) = [ p.histogram() for p in img.split() ] |
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[279] | 39 | for colorhisto in (r, g, b) : |
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| 40 | result.append(100.0 * (reduce(lambda current, next: current + (next[1] * (255 - next[0])), enumerate(colorhisto), 0) / 255.0) / nbpix) |
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| 41 | return tuple(result) |
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| 42 | |
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| 43 | def getPercentBlack(img, nbpix) : |
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| 44 | if img.mode != "L" : |
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| 45 | img = img.convert("L") |
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| 46 | return 100.0 * (reduce(lambda current, next: current + (next[1] * (255 - next[0])), enumerate(img.histogram()[:-1]), 0) / 255.0) / nbpix |
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| 47 | |
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| 48 | def getPercents(fname) : |
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| 49 | """Extracts the ink percentages from an image.""" |
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| 50 | image = Image.open(fname) |
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| 51 | nbpixels = image.size[0] * image.size[1] |
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| 52 | result = {} |
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| 53 | try : |
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| 54 | result["black"] = getPercentBlack(image, nbpixels) |
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| 55 | except : |
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| 56 | sys.stderr.write("Problem when extracting BLACK !\n") |
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| 57 | try : |
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| 58 | result["cmy"] = getPercentCMY(image, nbpixels) |
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| 59 | except : |
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| 60 | sys.stderr.write("Problem when extracting CMY !\n") |
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| 61 | return result |
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[277] | 62 | |
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| 63 | if __name__ == "__main__" : |
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[279] | 64 | print getPercents(sys.argv[1]) |
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