U++ forum: Welcome to the forum

Re: How to make a non transparent image transparent [message #32564 is a reply to message #32561]

Wed, 25 May 2011 08:45

tojocky
Messages: 607
Registered: April 2008
Location: UK

Contributor

cbpporter wrote on Tue, 24 May 2011 23:48

Show it, save it, do normal image stuff with it. I have the code for doing this and I can contribute it if the method does not exist. Wrote it today and generated hundreds of PNGs with it.

My question is: does it exist? If the method exists and I did not find it yet, I need to adapt my code to use the out of the box method.

In this case is very easy:

	FileIn in(filename);
	One<StreamRaster> r = StreamRaster::OpenAny(in);
	if(!r)
		return Image();
	Image img = r->GetImage();
	ImageBuffer b(img);
	RGBA *s = ~b;
	RGBA *e = s + b.GetLength();
	RGBA fc;
	fc.r = 0;
	fc.g = 16;
	fc.b = 156;
	fc.a = 0;
	while(s<e){
		if((s->r==fc.r)&&(s->g==fc.g)&&(s->b==fc.b))
			s->a=fc.a;
		++s;
	}

Don't forget to add required packages in your package (e.g.: Draw, plugin/png, plugin/tif, plugin/jpg, ..., etc. ).

Report message to a moderator