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T O P I C R E V I E W
tcardinal	Posted - May 25 2012 : 09:28:29 I am sure that this is fairly straighforward but can't see it in the help file. I have 2 images one in colour and one in black and white. I want to use the black and white image to remove parts from the colour image. Think of teh black and white image as a checker board and when applied to the colour image the colour image keeps all the parts overlayed by a black square and removes all the parts covered with a white square and replaces then with a solid colour or makes them transparent. Thanks Russell
2 L A T E S T R E P L I E S (Newest First)
tcardinal	Posted - May 29 2012 : 01:51:31 Thanks, I'll give it a go
fab	Posted - May 28 2012 : 14:41:31 You can load the alpha channel from an external file (assuming it has the same width and height of current image) with: ImageEnView1.IO.LoadFromFile('mainimage.jpg'); ImageEnView1.AlphaChannel.Read('alphachannel.jpg'); ImageEnVIew1.AlphaChannel.PixelFormat := ie8g; ImageEnView1.Update(); Now areas with "0" in alphachannel.jpg are transparent. If you want to fill transparent areas with a color (hence to discard alpha channel), you can execute: // fill transparent areas with red (255,0,0) ImageEnView1.SetAlphaRangePixelsColor(0, 0, CreateRGB(255, 0, 0)); ImageEnView1.RemoveAlphaChannel(); Hope this helps.