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How to generate a background during a pipeline?

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SebastianR  
#1 Posted : Friday, May 12, 2017 4:53:26 AM(UTC)
SebastianR

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Hello,

I want to resize and unsharp a large image
Code:

var targetSize = new Size(200, 100);
using (var resize = new Resize(targetSize, ResizeInterpolationMode.Lanczos3, ResizeMode.Fit))
using (var unsharp = new UnsharpMask(0.35f, 1f, 0f))

and then imprint on a white background
Code:
using (var bgGen = new ImageGenerator(targetSize, reader.PixelFormat, backgroundColor))

but the combiner takes only a topimage as argument (the background ist the image in the pipeline). Since both images are results of a pipeline how do I have to construct that pipeline (preferably without using two separate pipelines)?
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Fedor  
#2 Posted : Friday, May 12, 2017 5:43:01 AM(UTC)
Fedor

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This code should give you an idea how to implement it:

Code:
var targetSize = new Size(200, 100);
var backgroundColor = RgbColor.Green;

using (var reader = ImageReader.Create("../../../in.png"))
using (var resize = new Resize(targetSize, ResizeInterpolationMode.Lanczos3, ResizeMode.Fit))
using (var unsharp = new UnsharpMask(0.35f, 1f, 0f))
using (var bgGen = new ImageGenerator(targetSize, reader.PixelFormat, backgroundColor))
using (var combiner = new Combiner())
using (var writer = ImageWriter.Create("../../../out.png"))
{
	combiner.Mode = CombineMode.Alpha;
	combiner.TopImage = (reader + resize + unsharp);

	(bgGen + combiner + writer).Run();
}


Please note, you can manually construct a pipeline instead of using the plus operator:

Code:
combiner.TopImage = (reader + resize + unsharp);

-->
Code:
var topImage = new Pipeline();
topImage.Add(reader);
topImage.Add(resize);
topImage.Add(unsharp);
				
combiner.TopImage = topImage;


You can find more information here:

https://www.graphicsmill.com/doc...nes.htm#overlayingImages
Best regards,
Fedor Skvortsov
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thanks 1 user thanked Fedor for this useful post.
SebastianR on 5/12/2017(UTC)
SebastianR  
#3 Posted : Friday, May 12, 2017 6:01:52 AM(UTC)
SebastianR

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Brick wall Thank you. I missed the forest for the trees.
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SebastianR  
#4 Posted : Monday, May 15, 2017 1:13:22 AM(UTC)
SebastianR

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Extension of the original question.

I want to place the topImage in the middle of the generated background.

Code:

var targetSize = new Size(200, 100);
var backgroundColor = RgbColor.Green;

using (var reader = ImageReader.Create("../../../in.png"))
using (var resize = new Resize(targetSize, ResizeInterpolationMode.Lanczos3, ResizeMode.Fit))
using (var unsharp = new UnsharpMask(0.35f, 1f, 0f))
using (var bgGen = new ImageGenerator(targetSize, reader.PixelFormat, backgroundColor))
using (var combiner = new Combiner())
using (var writer = ImageWriter.Create("../../../out.png"))
{
	combiner.Mode = CombineMode.Alpha;
	var topImage = (reader + resize + unsharp);
	combiner.TopImage = topImage;

	// this doesn't work
	combiner.X = (int)Math.Round((double)(targetSize.Width - topImage.Width) / 2);
	combiner.Y = (int)Math.Round((double)(targetSize.Height - topImage.Height) / 2);

	(bgGen + combiner + writer).Run();
}


Problem is the new Width and Height of the new topImage are not available. Are they? And, if so, where do I find them?

So far I'm back to a separate pipeline.
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Fedor  
#5 Posted : Monday, May 15, 2017 8:44:33 AM(UTC)
Fedor

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You should specify a target image size explicitly instead of using ResizeMode.Fit:

Code:
var targetSize = new Size(200, 100);
var backgroundColor = RgbColor.Green;

using (var reader = ImageReader.Create("../../../in.png"))
using (var resize = new Resize())
using (var unsharp = new UnsharpMask(0.35f, 1f, 0f))
using (var bgGen = new ImageGenerator(targetSize, reader.PixelFormat, backgroundColor))
using (var combiner = new Combiner())
using (var writer = ImageWriter.Create("../../../out.png"))
{
	var actualTargetSize = Resize.CalculateDimensions(new Size(reader.Width, reader.Height),
		targetSize, ResizeMode.Fit);

	resize.Width = actualTargetSize.Width;
	resize.Height = actualTargetSize.Height;
	resize.ResizeMode = ResizeMode.Resize;

	combiner.Mode = CombineMode.Alpha;
	var topImage = (reader + resize + unsharp);
	combiner.TopImage = topImage;

	combiner.X = (int)Math.Round((double)(targetSize.Width - actualTargetSize.Width) / 2);
	combiner.Y = (int)Math.Round((double)(targetSize.Height - actualTargetSize.Height) / 2);

	(bgGen + combiner + writer).Run();
}
Best regards,
Fedor Skvortsov
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SebastianR on 5/17/2017(UTC)
SebastianR  
#6 Posted : Wednesday, May 17, 2017 11:38:37 PM(UTC)
SebastianR

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That did it, thank you.
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