cpython/Lib/dos-8x3/test_ima.py

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#! /usr/bin/env python
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"""Test script for the imageop module. This has the side
effect of partially testing the imgfile module as well.
Roger E. Masse
"""
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from test_support import verbose, unlink
import imageop, uu
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def main(use_rgbimg=1):
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# Create binary test files
uu.decode(get_qualified_path('testrgb.uue'), 'test.rgb')
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if use_rgbimg:
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image, width, height = getrgbimage('test.rgb')
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else:
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image, width, height = getimage('test.rgb')
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# Return the selected part of image, which should by width by height
# in size and consist of pixels of psize bytes.
if verbose:
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print 'crop'
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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:
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print 'scale'
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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:
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print 'tovideo'
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videoimage = imageop.tovideo (image, 4, width, height)
# Convert an rgb image to an 8 bit rgb
if verbose:
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print 'rgb2rgb8'
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greyimage = imageop.rgb2rgb8(image, width, height)
# Convert an 8 bit rgb image to a 24 bit rgb image
if verbose:
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print 'rgb82rgb'
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image = imageop.rgb82rgb(greyimage, width, height)
# Convert an rgb image to an 8 bit greyscale image
if verbose:
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print 'rgb2grey'
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greyimage = imageop.rgb2grey(image, width, height)
# Convert an 8 bit greyscale image to a 24 bit rgb image
if verbose:
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print 'grey2rgb'
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image = imageop.grey2rgb(greyimage, width, height)
# Convert a 8-bit deep greyscale image to a 1-bit deep image by
# thresholding all the pixels. The resulting image is tightly packed
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# and is probably only useful as an argument to mono2grey.
if verbose:
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print 'grey2mono'
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monoimage = imageop.grey2mono (greyimage, 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:
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print 'mono2grey'
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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:
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print 'dither2mono'
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monoimage = imageop.dither2mono (greyimage, width, height)
# Convert an 8-bit greyscale image to a 4-bit greyscale image without
# dithering.
if verbose:
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print 'grey2grey4'
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grey4image = imageop.grey2grey4 (greyimage, width, height)
# Convert an 8-bit greyscale image to a 2-bit greyscale image without
# dithering.
if verbose:
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print 'grey2grey2'
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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:
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print 'dither2grey2'
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grey2image = imageop.dither2grey2 (greyimage, width, height)
# Convert a 4-bit greyscale image to an 8-bit greyscale image.
if verbose:
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print 'grey42grey'
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greyimage = imageop.grey42grey (grey4image, width, height)
# Convert a 2-bit greyscale image to an 8-bit greyscale image.
if verbose:
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print 'grey22grey'
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image = imageop.grey22grey (grey2image, width, height)
# Cleanup
unlink('test.rgb')
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def getrgbimage(name):
"""return a tuple consisting of image (in 'imgfile' format but
using rgbimg instead) width and height"""
import rgbimg
try:
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sizes = rgbimg.sizeofimage(name)
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except rgbimg.error:
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name = get_qualified_path(name)
sizes = rgbimg.sizeofimage(name)
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if verbose:
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print 'rgbimg opening test image: %s, sizes: %s' % (name, str(sizes))
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image = rgbimg.longimagedata(name)
return (image, sizes[0], sizes[1])
def getimage(name):
"""return a tuple consisting of
image (in 'imgfile' format) width and height
"""
import imgfile
try:
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sizes = imgfile.getsizes(name)
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except imgfile.error:
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name = get_qualified_path(name)
sizes = imgfile.getsizes(name)
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if verbose:
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print 'imgfile opening test image: %s, sizes: %s' % (name, str(sizes))
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image = imgfile.read(name)
return (image, sizes[0], sizes[1])
def get_qualified_path(name):
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""" return a more qualified path to name"""
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import sys
import os
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path = sys.path
try:
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path = [os.path.dirname(__file__)] + path
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except NameError:
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pass
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for dir in path:
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fullname = os.path.join(dir, name)
if os.path.exists(fullname):
return fullname
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return name
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# rgbimg (unlike imgfile) is portable to platforms other than SGI.
# So we prefer to use it.
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main(use_rgbimg=1)