split CMYK script

resources/scripts/channels_split_cmyk.py

@@ -0,0 +1,80 @@
+# Channels > Split CMYK
+from lazpaint import image, dialog, layer, filters
+
+# check if it is a channel
+if layer.get_registry("split-channel") is not None:
+  dialog.show_message("Layer already split")
+  exit()
+
+layer_id = layer.get_id()
+layer_index = image.get_layer_index()
+layer_opacity = layer.get_opacity()
+layer_transparent = layer.is_transparent()
+cmy_id = None
+black_id = None
+
+# check if it has been split
+if layer.get_registry("split-channels-id") is not None:
+  for cur_layer_id in image.iterate_layers():
+    if layer.get_registry("split-source-id") == layer_id:
+      dialog.show_message("Layer already split")
+      exit()
+
+image.do_begin()
+channels = []
+if layer_transparent:
+  channels.append({"name": "Alpha", "channel": "A", "red": "alpha", "green": "alpha", "blue": "alpha", "alpha": "255"})
+channels.append({"name": "Black", "channel": "K", "red":"max(max(red,green),blue)", "green": "max(max(red,green),blue)", "blue": "max(max(red,green),blue)",  "alpha": "255"})
+#channels.append({"name": "Black", "channel": "K", "hue":"0", "saturation": "0", "lightness": "max(max(red,green),blue)",  "alpha": "255"})
+
+channels_id = [] 
+for ch in channels:
+  layer.select_id(layer_id)
+  layer.duplicate()
+  filters.filter_function(red = ch.get("red"), green = ch.get("green"), blue = ch.get("blue"), hue = ch.get("hue"), saturation = ch.get("saturation"), lightness = ch.get("lightness"), alpha = ch["alpha"], gamma_correction = False, corrected_hue = False)
+  layer.set_name(ch["name"] + " channel")
+  layer.set_opacity(layer_opacity)
+  if ch["channel"] == "A":
+    layer.set_blend_op(layer.BLEND_MASK)
+  layer.set_registry("split-channel", ch["channel"])
+  layer.set_registry("split-source-id", layer_id)
+  if ch["channel"] == "K":
+    black_id = layer.get_id()
+    layer.duplicate()
+    layer.set_blend_op(layer.BLEND_DIVIDE)
+    black_div_id = layer.get_id()
+    layer.select_id(layer_id)
+    layer.duplicate()
+    copy_index = image.get_layer_index()
+    image.move_layer_index(copy_index, copy_index + 1)
+    image.select_layer_index(copy_index + 2)
+    layer.merge_over()
+    cmy_id = layer.get_id()
+  else:
+    channels_id.append(layer.get_id())
+
+if cmy_id is not None:
+  channels = []
+  channels.append({"name": "Cyan", "channel": "C", "red": "red", "green": "1", "blue": "1", "alpha": "255"})
+  channels.append({"name": "Magenta", "channel": "M", "red": "1", "green": "green", "blue": "1", "alpha": "255"})
+  channels.append({"name": "Yellow", "channel": "Y", "red": "1", "green": "1", "blue": "blue", "alpha": "255"})
+  channels[-1]["last"] = True
+  for ch in channels:
+    layer.select_id(cmy_id)
+    if ch.get("last") is None:
+      layer.duplicate()
+    filters.filter_function(red = ch.get("red"), green = ch.get("green"), blue = ch.get("blue"), alpha = ch["alpha"], gamma_correction = False)
+    layer.set_name(ch["name"] + " channel")
+    layer.set_opacity(layer_opacity)
+    layer.set_blend_op(layer.BLEND_MULTIPLY)
+    layer.set_registry("split-channel", ch["channel"])
+    layer.set_registry("split-source-id", layer_id)
+    channels_id.append(layer.get_id())
+    
+if black_id is not None:
+  channels_id.append(black_id)
+  
+layer.select_id(layer_id)
+layer.set_registry("split-channels-id", channels_id)
+layer.set_visible(False)
+image.do_end()