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#!/usr/bin/env python
from __future__ import division, unicode_literals
from builtins import str
import logging
from PIL import Image
import PIL.ImageOps, PIL.ImageChops
from brother_ql.raster import BrotherQLRaster
from brother_ql.devicedependent import label_type_specs, ENDLESS_LABEL, DIE_CUT_LABEL, ROUND_DIE_CUT_LABEL, right_margin_addition
from brother_ql import BrotherQLUnsupportedCmd
from brother_ql.image_trafos import filtered_hsv
logger = logging.getLogger(__name__)
logging.getLogger("PIL.PngImagePlugin").setLevel(logging.WARNING)
def convert(qlr, images, label, **kwargs):
r"""Converts one or more images to a raster instruction file.
:param qlr:
An instance of the BrotherQLRaster class
:type qlr: :py:class:`brother_ql.raster.BrotherQLRaster`
:param images:
The images to be converted. They can be filenames or instances of Pillow's Image.
:type images: list(PIL.Image.Image) or list(str) images
:param str label:
Type of label the printout should be on.
:param \**kwargs:
See below
:Keyword Arguments:
* **cut** (``bool``) --
Enable cutting after printing the labels.
* **dither** (``bool``) --
Instead of applying a threshold to the pixel values, approximate grey tones with dithering.
* **compress**
* **red**
* **rotate**
* **dpi_600**
* **hq**
* **threshold**
"""
label_specs = label_type_specs[label]
dots_printable = label_specs['dots_printable']
right_margin_dots = label_specs['right_margin_dots']
right_margin_dots += right_margin_addition.get(qlr.model, 0)
device_pixel_width = qlr.get_pixel_width()
cut = kwargs.get('cut', True)
dither = kwargs.get('dither', False)
compress = kwargs.get('compress', False)
red = kwargs.get('red', False)
rotate = kwargs.get('rotate', 'auto')
if rotate != 'auto': rotate = int(rotate)
dpi_600 = kwargs.get('dpi_600', False)
hq = kwargs.get('hq', True)
threshold = kwargs.get('threshold', 70)
threshold = 100.0 - threshold
threshold = min(255, max(0, int(threshold/100.0 * 255)))
if red and not qlr.two_color_support:
raise BrotherQLUnsupportedCmd('Printing in red is not supported with the selected model.')
try:
qlr.add_switch_mode()
except BrotherQLUnsupportedCmd:
pass
qlr.add_invalidate()
qlr.add_initialize()
try:
qlr.add_switch_mode()
except BrotherQLUnsupportedCmd:
pass
for image in images:
if isinstance(image, Image.Image):
im = image
else:
try:
im = Image.open(image)
except:
raise NotImplementedError("The image argument needs to be an Image() instance, the filename to an image, or a file handle.")
if im.mode.endswith('A'):
# place in front of white background and get red of transparency
bg = Image.new("RGB", im.size, (255,255,255))
bg.paste(im, im.split()[-1])
im = bg
elif im.mode == "P":
# Convert GIF ("P") to RGB
im = im.convert("RGB" if red else "L")
elif im.mode == "L" and red:
# Convert greyscale to RGB if printing on black/red tape
im = im.convert("RGB")
if dpi_600:
dots_expected = [el*2 for el in dots_printable]
else:
dots_expected = dots_printable
if label_specs['kind'] == ENDLESS_LABEL:
if rotate not in ('auto', 0):
im = im.rotate(rotate, expand=True)
if dpi_600:
im = im.resize((im.size[0]//2, im.size[1]))
if im.size[0] != dots_printable[0]:
hsize = int((dots_printable[0] / im.size[0]) * im.size[1])
im = im.resize((dots_printable[0], hsize), Image.ANTIALIAS)
logger.warning('Need to resize the image...')
if im.size[0] < device_pixel_width:
new_im = Image.new(im.mode, (device_pixel_width, im.size[1]), (255,)*len(im.mode))
new_im.paste(im, (device_pixel_width-im.size[0]-right_margin_dots, 0))
im = new_im
elif label_specs['kind'] in (DIE_CUT_LABEL, ROUND_DIE_CUT_LABEL):
if rotate == 'auto':
if im.size[0] == dots_expected[1] and im.size[1] == dots_expected[0]:
im = im.rotate(90, expand=True)
elif rotate != 0:
im = im.rotate(rotate, expand=True)
if im.size[0] != dots_expected[0] or im.size[1] != dots_expected[1]:
raise ValueError("Bad image dimensions: %s. Expecting: %s." % (im.size, dots_expected))
if dpi_600:
im = im.resize((im.size[0]//2, im.size[1]))
new_im = Image.new(im.mode, (device_pixel_width, dots_expected[1]), (255,)*len(im.mode))
new_im.paste(im, (device_pixel_width-im.size[0]-right_margin_dots, 0))
im = new_im
if red:
filter_h = lambda h: 255 if (h < 40 or h > 210) else 0
filter_s = lambda s: 255 if s > 100 else 0
filter_v = lambda v: 255 if v > 80 else 0
red_im = filtered_hsv(im, filter_h, filter_s, filter_v)
red_im = red_im.convert("L")
red_im = PIL.ImageOps.invert(red_im)
red_im = red_im.point(lambda x: 0 if x < threshold else 255, mode="1")
filter_h = lambda h: 255
filter_s = lambda s: 255
filter_v = lambda v: 255 if v < 80 else 0
black_im = filtered_hsv(im, filter_h, filter_s, filter_v)
black_im = black_im.convert("L")
black_im = PIL.ImageOps.invert(black_im)
black_im = black_im.point(lambda x: 0 if x < threshold else 255, mode="1")
black_im = PIL.ImageChops.subtract(black_im, red_im)
else:
im = im.convert("L")
im = PIL.ImageOps.invert(im)
if dither:
im = im.convert("1", dither=Image.FLOYDSTEINBERG)
else:
im = im.point(lambda x: 0 if x < threshold else 255, mode="1")
qlr.add_status_information()
tape_size = label_specs['tape_size']
if label_specs['kind'] in (DIE_CUT_LABEL, ROUND_DIE_CUT_LABEL):
qlr.mtype = 0x0B
qlr.mwidth = tape_size[0]
qlr.mlength = tape_size[1]
else:
qlr.mtype = 0x0A
qlr.mwidth = tape_size[0]
qlr.mlength = 0
qlr.pquality = int(hq)
qlr.add_media_and_quality(im.size[1])
try:
if cut:
qlr.add_autocut(True)
qlr.add_cut_every(1)
except BrotherQLUnsupportedCmd:
pass
try:
qlr.dpi_600 = dpi_600
qlr.cut_at_end = cut
qlr.two_color_printing = True if red else False
qlr.add_expanded_mode()
except BrotherQLUnsupportedCmd:
pass
qlr.add_margins(label_specs['feed_margin'])
try:
if compress: qlr.add_compression(True)
except BrotherQLUnsupportedCmd:
pass
if red:
qlr.add_raster_data(black_im, red_im)
else:
qlr.add_raster_data(im)
qlr.add_print()
return qlr.data
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