old_contents: # -*- coding: utf-8 -*-
  
  """Plugin which adds a watermark to the image.
  
  Settings:
  
  - ``watermark``: path to the watermark image.
  - ``watermark_position``: the watermark position (scale or tile)
  - ``watermark_opacity``: the watermark opacity (0.0 to 1.0)
  
  """
  
  ## Original code: http://code.activestate.com/recipes/362879-watermark-with-pil/
  
  import logging
  from PIL import ImageDraw, Image, ImageEnhance
  from sigal import signals
  
  logger = logging.getLogger(__name__)
  
  
  def reduce_opacity(im, opacity):
      """Returns an image with reduced opacity."""
      assert opacity >= 0 and opacity <= 1
      if im.mode != 'RGBA':
          im = im.convert('RGBA')
      else:
          im = im.copy()
      alpha = im.split()[3]
      alpha = ImageEnhance.Brightness(alpha).enhance(opacity)
      im.putalpha(alpha)
      return im
  
  def watermark(im, mark, position, opacity=1):
      """Adds a watermark to an image."""
      if opacity < 1:
          mark = reduce_opacity(mark, opacity)
      if im.mode != 'RGBA':
          im = im.convert('RGBA')
      # create a transparent layer the size of the image and draw the
      # watermark in that layer.
      layer = Image.new('RGBA', im.size, (0,0,0,0))
      if position == 'tile':
          for y in range(0, im.size[1], mark.size[1]):
              for x in range(0, im.size[0], mark.size[0]):
                  layer.paste(mark, (x, y))
      elif position == 'scale':
          # scale, but preserve the aspect ratio
          ratio = min(
              float(im.size[0]) / mark.size[0], float(im.size[1]) / mark.size[1])
          w = int(mark.size[0] * ratio)
          h = int(mark.size[1] * ratio)
          mark = mark.resize((w, h))
          layer.paste(mark, ((im.size[0] - w) / 2, (im.size[1] - h) / 2))
      else:
          layer.paste(mark, position)
      # composite the watermark with the layer
      return Image.composite(layer, im, layer)
  
  def add_watermark(img, settings=None):
      logger.debug('Adding watermark to %r', img)
      mark = Image.open(settings['watermark'])
      position = 'scale'
      opacity = 1
      if settings['watermark_position']:
          position = settings['watermark_position']
      if settings['watermark_opacity']:
          opacity = settings["watermark_opacity"]
  
      return watermark(img, mark, position, opacity)
  
  
  def register(settings):
      if settings.get('watermark'):
          signals.img_resized.connect(add_watermark)
      else:
          logger.warning('Watermark image is not set')
  
new_contents: # -*- coding: utf-8 -*-
  
  """Plugin which adds a watermark to the image.
  
  Settings:
  
  - ``watermark``: path to the watermark image.
  - ``watermark_position``: the watermark position (scale or tile)
  - ``watermark_opacity``: the watermark opacity (0.0 to 1.0)
  
  """
  
  ## Original code: http://code.activestate.com/recipes/362879-watermark-with-pil/
  
  import logging
  from PIL import ImageDraw, Image, ImageEnhance
  from sigal import signals
  
  logger = logging.getLogger(__name__)
  
  
  def reduce_opacity(im, opacity):
      """Returns an image with reduced opacity."""
      assert opacity >= 0 and opacity <= 1
      if im.mode != 'RGBA':
          im = im.convert('RGBA')
      else:
          im = im.copy()
      alpha = im.split()[3]
      alpha = ImageEnhance.Brightness(alpha).enhance(opacity)
      im.putalpha(alpha)
      return im
  
  def watermark(im, mark, position, opacity=1):
      """Adds a watermark to an image."""
      if opacity < 1:
          mark = reduce_opacity(mark, opacity)
      if im.mode != 'RGBA':
          im = im.convert('RGBA')
      # create a transparent layer the size of the image and draw the
      # watermark in that layer.
      layer = Image.new('RGBA', im.size, (0,0,0,0))
      if position == 'tile':
          for y in range(0, im.size[1], mark.size[1]):
              for x in range(0, im.size[0], mark.size[0]):
                  layer.paste(mark, (x, y))
      elif position == 'scale':
          # scale, but preserve the aspect ratio
          ratio = min(
              float(im.size[0]) / mark.size[0], float(im.size[1]) / mark.size[1])
          w = int(mark.size[0] * ratio)
          h = int(mark.size[1] * ratio)
          mark = mark.resize((w, h))
          layer.paste(mark, ((im.size[0] - w) / 2, (im.size[1] - h) / 2))
      else:
          layer.paste(mark, position)
      # composite the watermark with the layer
      return Image.composite(layer, im, layer)
  
  def add_watermark(img, settings=None):
      logger.debug('Adding watermark to %r', img)
      mark = Image.open(settings['watermark'])
      position = 'scale'
      opacity = 1
      if settings.get('watermark_position'):
          position = settings['watermark_position']
      if settings.get('watermark_opacity'):
          opacity = settings["watermark_opacity"]
  
      return watermark(img, mark, position, opacity)
  
  
  def register(settings):
      if settings.get('watermark'):
          signals.img_resized.connect(add_watermark)
      else:
          logger.warning('Watermark image is not set')
  
subject: Fix conditionals