kopia lustrzana https://github.com/lowtechmag/solar-plugins
127 wiersze
4.8 KiB
Python
127 wiersze
4.8 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*- #
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#adds advanced dithering effect to images
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# Copyright (C) 2018 Roel Roscam Abbing
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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import os, logging, imghdr
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from pelican import signals
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from bs4 import BeautifulSoup
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logger = logging.getLogger(__name__)
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try:
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from PIL import Image
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import hitherdither
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enabled = True
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except:
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logging.warning("Unable to load PIL or hitherdither, disabling thumbnailer")
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enabled = False
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DEFAULT_IMAGE_DIR = "images"
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DEFAULT_DITHER_DIR = "dithers"
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DEFAULT_THRESHOLD = [96, 96, 96] # this sets the contrast of the final image, rgb
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DEFAULT_TRANSPARENCY= False
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DEFAULT_TRANSPARENT_COLOR = [(125,125,125)]
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DEFAULT_DITHER_PALETTE = [(25,25,25), (75,75,75),(125,125,125),(175,175,175),(225,225,225),(250,250,250)] # 6 tone palette\
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DEFAULT_RESIZE_OUTPUT = True
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DEFAULT_MAX_SIZE = (800,800)
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#11 tone palette, heavier, more detail, less visible dither pattern
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#[(0,0,0),(25,25,25),(50,50,50),(75,75,75),(100,100,100),(125,125,125),(150,150,150),(175,175,175),(200,200,200),(225,225,225),(250,250,250)]
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#3 tone palette, lighter, heavier dithering effect
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# [(0,0,0), (125,125,125), (250,250,250)]
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def _image_path(pelican):
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return os.path.join(pelican.settings['PATH'],
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pelican.settings.get("IMAGE_PATH", DEFAULT_IMAGE_DIR)).rstrip('/')
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def _out_path(pelican):
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return os.path.join(pelican.settings['OUTPUT_PATH'],
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pelican.settings.get('DITHER_DIR', DEFAULT_DITHER_DIR)).rstrip('/')
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def dither(pelican):
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global enabled
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if not enabled:
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return
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in_path = _image_path(pelican)
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out_path = _out_path(pelican)
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transparency = pelican.settings.get("TRANSPARENCY",DEFAULT_TRANSPARENCY)
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STABLE_SITEURL = pelican.settings.get("STABLE_SITEURL")
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if not os.path.exists(out_path):
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os.mkdir(out_path)
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if pelican.settings.get("SITEURL") == STABLE_SITEURL:
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for dirpath, _, filenames in os.walk(in_path):
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for filename in filenames:
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file_, ext = os.path.splitext(filename)
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fn= os.path.join(dirpath,filename)
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of = os.path.join(out_path, filename.replace(ext,'.png'))
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if not os.path.exists(of) and imghdr.what(fn):
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logging.debug("Dither plugin: dithering {}".format(fn))
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img= Image.open(fn).convert('RGB')
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resize = pelican.settings.get('RESIZE', DEFAULT_RESIZE_OUTPUT)
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if resize:
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image_size = pelican.settings.get('SIZE', DEFAULT_MAX_SIZE)
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img.thumbnail(image_size, Image.LANCZOS)
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palette = hitherdither.palette.Palette(pelican.settings.get('DITHER_PALETTE', DEFAULT_DITHER_PALETTE))
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threshold = pelican.settings.get('THRESHOLD', DEFAULT_THRESHOLD)
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img_dithered = hitherdither.ordered.bayer.bayer_dithering(img, palette, threshold, order=8) #see hither dither documentation for different dithering algos
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img_dithered.save(of, optimize=True)
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#logging.debug(calculate_savings(in_path,out_path))
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def parse_for_images(instance):
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#based on better_figures_and_images plugin by @dflock, @phrawzty,@if1live,@jar1karp,@dhalperi,@aqw,@adworacz
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#https://github.com/getpelican/pelican-plugins/blob/master/better_figures_and_images/better_figures_and_images.py
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global DEFAULT_IMAGE_DIR
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global DEFAULT_DITHER_DIR
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global enabled
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if not enabled:
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return
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image_dir = instance.settings.get("IMAGE_PATH", DEFAULT_IMAGE_DIR)
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dither_dir = instance.settings.get('DITHER_DIR', DEFAULT_DITHER_DIR)
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if instance._content is not None:
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content = instance._content
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soup = BeautifulSoup(content, 'html.parser')
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for img in soup(['img', 'object']):
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fn, ext = os.path.splitext(img['src'])
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if ext.startswith('.'):
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img['src'] = img['src'].replace(ext, '.png')
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img['src'] = img['src'].replace(image_dir,dither_dir)
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# logger.debug('dither plugin: rewrote image source to {}'.format(img['src']))
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instance._content = soup.decode()
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def register():
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signals.finalized.connect(dither)
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signals.content_object_init.connect(parse_for_images)
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