def get_file_name(self, ext = 'png'):
if self.file_name:
return self.file_name
if self.image:
self.file_name = temp_file_name('.'+ext, config.get_tmp_dir())
self.image.save(self.file_name)
return self.file_name
assert(False)
def __call__(self, img_ref):
if self.colors >= 256:
return img_ref
img = img_ref.get_image()
if img.mode != 'L':
return img_ref
colors = image_colors(img)
if colors <= self.colors:
return img_ref
out_file_name = temp_file_name('.png', config.get_tmp_dir())
cmd = ['convert']
scolors = '%d' % (self.colors,)
cmd.extend(['-colors', scolors])
cmd.extend(['-depth', '8', img_ref.get_file_name(), out_file_name])
check_call(cmd)
return ImageRef(file_name = out_file_name)
def __call__(self, img_ref):
out_file_name = temp_file_name('.png', config.get_tmp_dir())
check_call(['unpaper', '-q', '--no-deskew',
img_ref.get_file_name(), out_file_name])
return ImgRef(file_name = out_file_name)
