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#1 Posted : Wednesday, May 17, 2017 11:37:33 PM(UTC)

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I got two images source an alphaSource and I want to transfer the alphachannel of the alphasource to the source;

So far I've gotten so far:
using (var alphaReader = ImageReader.Create(@"C:\Users\srombach\AppData\Local\Temp\KittelbergerAMPS3ImagePlugin.alpha.tmpA736.tif"))
using (var sourceReader = new ImageGenerator(alphaReader, RgbColor.Black))
using (var splitter = new ChannelSplitter())
using (var setAlpha = new SetAlpha())
using (var writer = new TiffWriter(Path.GetTempPath() + "alphainjected3.tif"))
    setAlpha.AlphaSource = splitter[Channel.Alpha];
    (sourceReader + setAlpha + writer).Run();

but it throws an error "No source element in pipemap." which is understandable because the setAlpha.AlphaSource-Pipeline is not executed.

I tried various combinations of (https://github.com/aurigma/GraphicsMill.Samples) ChannelsExample.cs, BrightnessContrastExample.cs, MultipleSourcesExample.cs, but came up with no solution.

Please set me on the right track.

Edited by user Thursday, May 18, 2017 12:58:38 AM(UTC)  | Reason: removed RgbChannelSplitter for ChannelSplitter

#2 Posted : Friday, May 19, 2017 3:58:53 AM(UTC)

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Currently, I see no way to implement it using a single pipeline and without using a temporary file:

using (var alphaSourceReader = ImageReader.Create("../../../in.png"))
	using (var splitter = new RgbChannelSplitter())
	using (var alphaWriter = ImageWriter.Create("../../../alpha_temp.tif"))
		splitter.A = alphaWriter;


	using (var alphaReader = ImageReader.Create("../../../alpha_temp.tif"))
	using (var sourceReader = new ImageGenerator(alphaSourceReader, RgbColor.Blue))
	using (var setAlpha = new SetAlpha())
	using (var sourceWriter = ImageWriter.Create("../../../out.tif"))
		setAlpha.AlphaSource = alphaReader;

		(sourceReader + setAlpha + sourceWriter).Run();

Even though, we will implement it in the further versions of Graphics Mill (Aurigma Bug #0023326).
Best regards,
Fedor Skvortsov
Eugene Kosmin  
#3 Posted : Monday, May 29, 2017 5:50:18 PM(UTC)
Eugene Kosmin

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Hi, Sebastian.

You can try to use ChannelCombiner:


using (var sourceReader = ImageReader.Create("source.jpg"))
using (var splitter = new RgbChannelSplitter())
using (var alphaReader = ImageReader.Create("AlphaSource.png"))
using (var alphaSplitter = new RgbChannelSplitter())
using (var writer = ImageWriter.Create("result.png"))
using (var channelCombiner = new RgbChannelCombiner())

    channelCombiner.R = splitter.R;
    channelCombiner.G = splitter.G;
    channelCombiner.B = splitter.B;

    channelCombiner.A = alphaSplitter.A;


Best regards,
Eugene Kosmin.
Aurigma Development Team
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