Hi.
I say first , sorry my poor English.
summary
This plugin changes an image into black and white , and changes brightness into transparency.
All pixels(RGB) = 0 , and after , this can change a color.
Purpose
1.For lineart
2. To make the monotone photo.
This can easily make monotone photo.
Of course , even if you don't use this plugin , you can make this image using "black and white" and "curves". For the person who is inexperienced how to use "curves".
An interesting effect is given when you change a background color.
Download
This made by "Code Lab"
Thank you BoltBait.
page of Japanese explanation in my site
http://paintnet.web.fc2.com/plugin/dpy/blackalpha.htm