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https://github.com/python-pillow/Pillow.git
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136 lines
4.4 KiB
Python
136 lines
4.4 KiB
Python
from helper import unittest, PillowTestCase, hopper
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from PIL import Image
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from PIL._util import py3
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import colorsys
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import itertools
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class TestFormatHSV(PillowTestCase):
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def int_to_float(self, i):
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return float(i)/255.0
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def str_to_float(self, i):
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return float(ord(i))/255.0
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def tuple_to_ints(self, tp):
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x, y, z = tp
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return int(x*255.0), int(y*255.0), int(z*255.0)
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def test_sanity(self):
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Image.new('HSV', (100, 100))
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def wedge(self):
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w = Image._wedge()
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w90 = w.rotate(90)
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(px, h) = w.size
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r = Image.new('L', (px*3, h))
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g = r.copy()
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b = r.copy()
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r.paste(w, (0, 0))
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r.paste(w90, (px, 0))
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g.paste(w90, (0, 0))
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g.paste(w, (2*px, 0))
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b.paste(w, (px, 0))
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b.paste(w90, (2*px, 0))
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img = Image.merge('RGB', (r, g, b))
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return img
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def to_xxx_colorsys(self, im, func, mode):
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# convert the hard way using the library colorsys routines.
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(r, g, b) = im.split()
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if py3:
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conv_func = self.int_to_float
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else:
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conv_func = self.str_to_float
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if hasattr(itertools, 'izip'):
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iter_helper = itertools.izip
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else:
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iter_helper = itertools.zip_longest
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converted = [self.tuple_to_ints(func(conv_func(_r), conv_func(_g),
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conv_func(_b)))
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for (_r, _g, _b) in iter_helper(r.tobytes(), g.tobytes(),
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b.tobytes())]
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if py3:
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new_bytes = b''.join(bytes(chr(h)+chr(s)+chr(v), 'latin-1') for (
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h, s, v) in converted)
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else:
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new_bytes = b''.join(chr(h)+chr(s)+chr(v) for (
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h, s, v) in converted)
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hsv = Image.frombytes(mode, r.size, new_bytes)
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return hsv
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def to_hsv_colorsys(self, im):
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return self.to_xxx_colorsys(im, colorsys.rgb_to_hsv, 'HSV')
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def to_rgb_colorsys(self, im):
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return self.to_xxx_colorsys(im, colorsys.hsv_to_rgb, 'RGB')
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def test_wedge(self):
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src = self.wedge().resize((3*32, 32), Image.BILINEAR)
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im = src.convert('HSV')
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comparable = self.to_hsv_colorsys(src)
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self.assert_image_similar(im.getchannel(0), comparable.getchannel(0),
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1, "Hue conversion is wrong")
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self.assert_image_similar(im.getchannel(1), comparable.getchannel(1),
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1, "Saturation conversion is wrong")
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self.assert_image_similar(im.getchannel(2), comparable.getchannel(2),
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1, "Value conversion is wrong")
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comparable = src
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im = im.convert('RGB')
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self.assert_image_similar(im.getchannel(0), comparable.getchannel(0),
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3, "R conversion is wrong")
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self.assert_image_similar(im.getchannel(1), comparable.getchannel(1),
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3, "G conversion is wrong")
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self.assert_image_similar(im.getchannel(2), comparable.getchannel(2),
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3, "B conversion is wrong")
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def test_convert(self):
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im = hopper('RGB').convert('HSV')
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comparable = self.to_hsv_colorsys(hopper('RGB'))
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self.assert_image_similar(im.getchannel(0), comparable.getchannel(0),
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1, "Hue conversion is wrong")
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self.assert_image_similar(im.getchannel(1), comparable.getchannel(1),
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1, "Saturation conversion is wrong")
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self.assert_image_similar(im.getchannel(2), comparable.getchannel(2),
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1, "Value conversion is wrong")
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def test_hsv_to_rgb(self):
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comparable = self.to_hsv_colorsys(hopper('RGB'))
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converted = comparable.convert('RGB')
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comparable = self.to_rgb_colorsys(comparable)
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self.assert_image_similar(converted.getchannel(0),
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comparable.getchannel(0),
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3, "R conversion is wrong")
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self.assert_image_similar(converted.getchannel(1),
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comparable.getchannel(1),
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3, "G conversion is wrong")
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self.assert_image_similar(converted.getchannel(2),
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comparable.getchannel(2),
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3, "B conversion is wrong")
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if __name__ == '__main__':
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unittest.main()
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