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| -rwxr-xr-x | Lib/test/test_imageop.py | 121 | ||||
| -rw-r--r-- | Lib/test/testall.py | 1 |
2 files changed, 122 insertions, 0 deletions
diff --git a/Lib/test/test_imageop.py b/Lib/test/test_imageop.py new file mode 100755 index 0000000000..54bae1a705 --- /dev/null +++ b/Lib/test/test_imageop.py @@ -0,0 +1,121 @@ +#! /usr/bin/env python +"""Test script for the imageop module. This has the side + effect of partially testing the imgfile module as well. + Roger E. Masse +""" +from test_support import verbose + +import imageop + +def main(): + + image, width, height = getimage('test.rgb') + + # Return the selected part of image, which should by width by height + # in size and consist of pixels of psize bytes. + if verbose: + print 'crop' + newimage = imageop.crop (image, 4, width, height, 0, 0, 1, 1) + + # Return image scaled to size newwidth by newheight. No interpolation + # is done, scaling is done by simple-minded pixel duplication or removal. + # Therefore, computer-generated images or dithered images will + # not look nice after scaling. + if verbose: + print 'scale' + scaleimage = imageop.scale(image, 4, width, height, 1, 1) + + # Run a vertical low-pass filter over an image. It does so by computing + # each destination pixel as the average of two vertically-aligned source + # pixels. The main use of this routine is to forestall excessive flicker + # if the image two vertically-aligned source pixels, hence the name. + if verbose: + print 'tovideo' + videoimage = imageop.tovideo (image, 4, width, height) + + image, width, height = getimage('greytest.rgb') + # Convert a 8-bit deep greyscale image to a 1-bit deep image by + # tresholding all the pixels. The resulting image is tightly packed + # and is probably only useful as an argument to mono2grey. + if verbose: + print 'grey2mono' + monoimage = imageop.grey2mono (image, width, height, 0) + + #monoimage, width, height = getimage('monotest.rgb') + + # Convert a 1-bit monochrome image to an 8 bit greyscale or color image. + # All pixels that are zero-valued on input get value p0 on output and + # all one-value input pixels get value p1 on output. To convert a + # monochrome black-and-white image to greyscale pass the values 0 and + # 255 respectively. + if verbose: + print 'mono2grey' + greyimage = imageop.mono2grey (monoimage, width, height, 0, 255) + + # Convert an 8-bit greyscale image to a 1-bit monochrome image using a + # (simple-minded) dithering algorithm. + if verbose: + print 'dither2mono' + monoimage = imageop.dither2mono (greyimage, width, height) + + + # Convert an 8-bit greyscale image to a 4-bit greyscale image without + # dithering. + if verbose: + print 'grey2grey4' + grey4image = imageop.grey2grey4 (greyimage, width, height) + + # Convert an 8-bit greyscale image to a 2-bit greyscale image without + # dithering. + if verbose: + print 'grey2grey2' + grey2image = imageop.grey2grey2 (greyimage, width, height) + + # Convert an 8-bit greyscale image to a 2-bit greyscale image with + # dithering. As for dither2mono, the dithering algorithm is currently + # very simple. + if verbose: + print 'dither2grey2' + grey2image = imageop.dither2grey2 (greyimage, width, height) + + # Convert a 4-bit greyscale image to an 8-bit greyscale image. + if verbose: + print 'grey42grey' + greyimage = imageop.grey42grey (grey4image, width, height) + + # Convert a 2-bit greyscale image to an 8-bit greyscale image. + if verbose: + print 'grey22grey' + image = imageop.grey22grey (grey2image, width, height) + +def getimage(name): + """return a tuple consisting of + image (in 'imgfile' format) width and height + """ + + import sys + import os + import imgfile + import string + + # try opening the name directly + try: + sizes = imgfile.getsizes(name) + except imgfile.error: + # get a more qualified path component of the script... + if __name__ == '__main__': + ourname = sys.argv[0] + else: # ...or the full path of the module + ourname = sys.modules[__name__].__file__ + + parts = string.splitfields(ourname, os.sep) + parts[-1] = name + name = string.joinfields(parts, os.sep) + sizes = imgfile.getsizes(name) + if verbose: + print 'Opening test image: %s, sizes: %s' % (name, str(sizes)) + + image = imgfile.read(name) + return (image, sizes[0], sizes[1]) + +main() diff --git a/Lib/test/testall.py b/Lib/test/testall.py index 3dc30c3bd4..a4e6da6125 100644 --- a/Lib/test/testall.py +++ b/Lib/test/testall.py @@ -30,6 +30,7 @@ tests = ['test_grammar', 'test_gdbm', 'test_grp', 'test_operator', + 'test_imageop', ] if __name__ == '__main__': |