Black foreground, white background

[onurdumangoz]

I have image with transparent background. I want convert it to, white background and solid black foreground.

For examle:
I need to convert an image with a transparent background to an image with a white background and black foreground.

I can do this in CLI with this code:
magick im-logo-1.png xc:black -channel RGB -clut -alpha remove im-logo-2.png

How can I do this in Magick.NET?

[dlemstra]

It looks like you found a bug in the code. While writing an answer I figured out there was a bug in the code of the .Clut method. This has been fixed an will become available in the next release. After that release you can do this:

using var image = new MagickImage("im-logo-1.png");
using var clutImage = new MagickImage("xc:black", 1, 1);
image.Clut(clutImage, Channels.RGB); // This overload will also be added and in the current release the channels are used incorrectly.
image.Alpha(AlphaOption.Remove);
image.Write("im-logo-2.png");

[onurdumangoz]

Thank you for your work. I'm waiting for the update.

[alexlezam]

According to the answer in the update, Channels.RGB is going to be added, so that it only does it only where it is not transparent?

[dlemstra]

That is correct. It means this operation will only change the Red Green and Blue channels.