def main(use_rgbimg=1):
# Create binary test files
uu.decode(get_qualified_path('testrgb'+os.extsep+'uue'), 'test'+os.extsep+'rgb')
if use_rgbimg:
image, width, height = getrgbimage('test'+os.extsep+'rgb')
else:
image, width, height = getimage('test'+os.extsep+'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)
# Convert an rgb image to an 8 bit rgb
if verbose:
print 'rgb2rgb8'
greyimage = imageop.rgb2rgb8(image, width, height)
# Convert an 8 bit rgb image to a 24 bit rgb image
if verbose:
print 'rgb82rgb'
image = imageop.rgb82rgb(greyimage, width, height)
# Convert an rgb image to an 8 bit greyscale image
if verbose:
print 'rgb2grey'
greyimage = imageop.rgb2grey(image, width, height)
# Convert an 8 bit greyscale image to a 24 bit rgb image
if verbose:
print 'grey2rgb'
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
# and is probably only useful as an argument to mono2grey.
if verbose:
print 'grey2mono'
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:
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)
# Cleanup
unlink('test'+os.extsep+'rgb')
#! /usr/bin/env python
def main(use_rgbimg=1):
# Create binary test files
uu.decode(get_qualified_path('testrgb' + os.extsep + 'uue'),
'test' + os.extsep + 'rgb')
if use_rgbimg:
image, width, height = getrgbimage('test' + os.extsep + 'rgb')
else:
image, width, height = getimage('test' + os.extsep + '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)
# Convert an rgb image to an 8 bit rgb
if verbose:
print 'rgb2rgb8'
greyimage = imageop.rgb2rgb8(image, width, height)
# Convert an 8 bit rgb image to a 24 bit rgb image
if verbose:
print 'rgb82rgb'
image = imageop.rgb82rgb(greyimage, width, height)
# Convert an rgb image to an 8 bit greyscale image
if verbose:
print 'rgb2grey'
greyimage = imageop.rgb2grey(image, width, height)
# Convert an 8 bit greyscale image to a 24 bit rgb image
if verbose:
print 'grey2rgb'
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
# and is probably only useful as an argument to mono2grey.
if verbose:
print 'grey2mono'
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:
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)
# Cleanup
unlink('test' + os.extsep + 'rgb')
#! /usr/bin/env python