Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_imageop.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 2456d8ff9fa8
children 678a3f1d0c80
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1 #! /usr/bin/env python
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2
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3 """Test script for the imageop module. This has the side
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4 effect of partially testing the imgfile module as well.
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5 Roger E. Masse
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6 """
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7
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8 from test_support import verbose, unlink
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9
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10 import imageop, uu
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11
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12 def main(use_rgbimg=1):
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13
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14 # Create binary test files
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15 uu.decode(get_qualified_path('testrgb.uue'), 'test.rgb')
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16
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17 if use_rgbimg:
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18 image, width, height = getrgbimage('test.rgb')
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19 else:
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20 image, width, height = getimage('test.rgb')
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21
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22 # Return the selected part of image, which should by width by height
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23 # in size and consist of pixels of psize bytes.
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24 if verbose:
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25 print 'crop'
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26 newimage = imageop.crop (image, 4, width, height, 0, 0, 1, 1)
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27
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28 # Return image scaled to size newwidth by newheight. No interpolation
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29 # is done, scaling is done by simple-minded pixel duplication or removal.
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30 # Therefore, computer-generated images or dithered images will
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31 # not look nice after scaling.
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32 if verbose:
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33 print 'scale'
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34 scaleimage = imageop.scale(image, 4, width, height, 1, 1)
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35
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36 # Run a vertical low-pass filter over an image. It does so by computing
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37 # each destination pixel as the average of two vertically-aligned source
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38 # pixels. The main use of this routine is to forestall excessive flicker
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39 # if the image two vertically-aligned source pixels, hence the name.
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40 if verbose:
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41 print 'tovideo'
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42 videoimage = imageop.tovideo (image, 4, width, height)
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43
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44 # Convert an rgb image to an 8 bit rgb
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45 if verbose:
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46 print 'rgb2rgb8'
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47 greyimage = imageop.rgb2rgb8(image, width, height)
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48
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49 # Convert an 8 bit rgb image to a 24 bit rgb image
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50 if verbose:
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51 print 'rgb82rgb'
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52 image = imageop.rgb82rgb(greyimage, width, height)
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53
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54 # Convert an rgb image to an 8 bit greyscale image
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55 if verbose:
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56 print 'rgb2grey'
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57 greyimage = imageop.rgb2grey(image, width, height)
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58
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59 # Convert an 8 bit greyscale image to a 24 bit rgb image
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60 if verbose:
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61 print 'grey2rgb'
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62 image = imageop.grey2rgb(greyimage, width, height)
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63
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64 # Convert a 8-bit deep greyscale image to a 1-bit deep image by
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65 # tresholding all the pixels. The resulting image is tightly packed
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66 # and is probably only useful as an argument to mono2grey.
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67 if verbose:
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68 print 'grey2mono'
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69 monoimage = imageop.grey2mono (greyimage, width, height, 0)
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70
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71 # monoimage, width, height = getimage('monotest.rgb')
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72 # Convert a 1-bit monochrome image to an 8 bit greyscale or color image.
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73 # All pixels that are zero-valued on input get value p0 on output and
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74 # all one-value input pixels get value p1 on output. To convert a
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75 # monochrome black-and-white image to greyscale pass the values 0 and
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76 # 255 respectively.
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77 if verbose:
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78 print 'mono2grey'
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79 greyimage = imageop.mono2grey (monoimage, width, height, 0, 255)
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80
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81 # Convert an 8-bit greyscale image to a 1-bit monochrome image using a
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82 # (simple-minded) dithering algorithm.
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83 if verbose:
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84 print 'dither2mono'
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85 monoimage = imageop.dither2mono (greyimage, width, height)
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86
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87 # Convert an 8-bit greyscale image to a 4-bit greyscale image without
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88 # dithering.
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89 if verbose:
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90 print 'grey2grey4'
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91 grey4image = imageop.grey2grey4 (greyimage, width, height)
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92
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93 # Convert an 8-bit greyscale image to a 2-bit greyscale image without
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94 # dithering.
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95 if verbose:
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96 print 'grey2grey2'
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97 grey2image = imageop.grey2grey2 (greyimage, width, height)
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98
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99 # Convert an 8-bit greyscale image to a 2-bit greyscale image with
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100 # dithering. As for dither2mono, the dithering algorithm is currently
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101 # very simple.
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102 if verbose:
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103 print 'dither2grey2'
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104 grey2image = imageop.dither2grey2 (greyimage, width, height)
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105
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106 # Convert a 4-bit greyscale image to an 8-bit greyscale image.
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107 if verbose:
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108 print 'grey42grey'
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109 greyimage = imageop.grey42grey (grey4image, width, height)
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110
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111 # Convert a 2-bit greyscale image to an 8-bit greyscale image.
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112 if verbose:
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113 print 'grey22grey'
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114 image = imageop.grey22grey (grey2image, width, height)
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115
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116 # Cleanup
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117 unlink('test.rgb')
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118
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119 def getrgbimage(name):
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120 """return a tuple consisting of image (in 'imgfile' format but
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121 using rgbimg instead) width and height"""
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122
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123 import rgbimg
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124
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125 try:
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126 sizes = rgbimg.sizeofimage(name)
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127 except rgbimg.error:
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128 name = get_qualified_path(name)
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129 sizes = rgbimg.sizeofimage(name)
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130 if verbose:
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131 print 'rgbimg opening test image: %s, sizes: %s' % (name, str(sizes))
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132
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133 image = rgbimg.longimagedata(name)
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134 return (image, sizes[0], sizes[1])
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135
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136 def getimage(name):
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137 """return a tuple consisting of
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138 image (in 'imgfile' format) width and height
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139 """
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140
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141 import imgfile
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142
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143 try:
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144 sizes = imgfile.getsizes(name)
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145 except imgfile.error:
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146 name = get_qualified_path(name)
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147 sizes = imgfile.getsizes(name)
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148 if verbose:
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149 print 'imgfile opening test image: %s, sizes: %s' % (name, str(sizes))
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150
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151 image = imgfile.read(name)
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152 return (image, sizes[0], sizes[1])
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153
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154 def get_qualified_path(name):
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155 """ return a more qualified path to name"""
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156 import sys
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157 import os
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158 for dir in sys.path:
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159 fullname = os.path.join(dir, name)
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160 if os.path.exists(fullname):
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161 return fullname
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162 return name
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163
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164 # rgbimg (unlike imgfile) is portable to platforms other than SGI.
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165 # So we prefer to use it.
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166 main(use_rgbimg=1)