Export Layers as PNG

Seems buggy - worked better after I made this change:
newlayer = tmp.merge_visible_layers(0)
...
pdb.file_png_save(tmp, newlayer, ...
instead of
pdb.file_png_save(tmp, tmp.layers[0], ...

Works well, except the origin of the separate png files that were exported seems to be off.
Steps to reproduce:
* 1 xfc or psd file with multiple layers that are smaller than the image size.
* export layers -> as png
* flatten images NO, only visible layers, yes or no
* result: all layers have the wrong origin in their respective sub-pngs.
* you can see this by reopening the output png files in gimp.

The plugin doesn't care about problematic characters for the file system given by the names of the layers. For example if you have a ":" character in the layer name the plugin creates only 1 empty file with a part of the layer name. I ran into this problem as i tested the standard globe animation plugin of Gimp, because it creates many layers with the ":" contained in the name.

The solution is to let the script remove / substitute all problematic characters. I did it by substituting this line:

        name = layer.name + ".png"

with this one (works well for windows):

        name = re.sub('([\\\\/:*?"<>|])', "_", layer.name) + ".png"

and by adding this line on top of the script:

import re

The script looks after that like this:

#!/usr/bin/env python
# Author: Chris Mohler
# Copyright 2009 Chris Mohler
# License: GPL v3
# Version 0.3
# GIMP plugin to export layers as PNGs
# Fixed Version BY BPhoenix

from gimpfu import *
import os
import re

gettext.install("gimp20-python", gimp.locale_directory, unicode=True)


def export_layers(img, drw, path, flatten=False):
	reg = re.compile
	dupe = img.duplicate()
	for layer in dupe.layers:
		layer.visible = 0
	for layer in dupe.layers:
		layer.visible = 1
		name = re.sub('([\\\\/:*?"<>|])', "_", layer.name) + ".png"
		fullpath = os.path.join(path, name);
		tmp = dupe.duplicate()
		if (flatten):
			tmp.flatten()
		pdb.file_png_save(tmp, tmp.layers[0], fullpath, name, 0, 9, 1, 1, 1, 1, 1)
		dupe.remove_layer(layer)


register(
	proc_name=("python-fu-export-layers"),
	blurb=("Export Layers as PNG"),
	help=("Export all layers as individual PNG files."),
	author=("Chris Mohler"),
	copyright=("Chris Mohler"),
	date=("2009"),
	label=("as _PNG"),
	imagetypes=("*"),
	params=[
	(PF_IMAGE, "img", "Image", None),
	(PF_DRAWABLE, "drw", "Drawable", None),
	(PF_DIRNAME, "path", "Save PNGs here", os.getcwd()),
	(PF_BOOL, "flatten", "Flatten Images?", False),
		],
	results=[],
	function=(export_layers), 
	menu=("/File/E_xport Layers"), 
	domain=("gimp20-python", gimp.locale_directory)
	)

main()

And at least: Thank you for this plugin. Now i can easily create APNGs with the APNG Anime Maker.

It's a pitty, that the APNG Plugin on this site doesn't really work, that Gimp hasn't a build in filter for this and that the MNG Plugin is broken too...