how to call vips_addalpha()

[Martinay]

The vips library has the vips_addalpha () function.
https://libvips.github.io/libvips/API/current/libvips-conversion.html#vips-addalpha

Is it possible to use this function with the .Net Binding?

I only found a binding for the method vips_image_hasalpha () and a similar issue for the ruby binding libvips/ruby-vips#168 .

I added for now the workaround mentioned in the ruby binding

var maxAlpha = (editImage.Interpretation == Enums.Interpretation.Grey16 || editImage.Interpretation == Enums.Interpretation.Rgb16)
                            ? 65535
                            : 255;
editImage = editImage.BandjoinConst(new [] { maxAlpha });

Thank you for your help and this amazing library.

[kleisauke]

Hi @Martinay,

You're right, this convenience function was missing. I just added it with commit 81dbca8.

If you want to test this, you can use the nightly version of NetVips. Add the https://ci.appveyor.com/nuget/net-vips feed in the <packageSources> section of your NuGet.config:

<packageSources>
  <add key="netvips-nightly" value="https://ci.appveyor.com/nuget/net-vips" />
</packageSources>

And update NetVips to 2.0.0 (build number 248 - prerelease). This will be part of the v2.0.0 release.

[Martinay]

Great :) . Thank you very much for your help

[kleisauke]

NetVips v2.0.0 is now available.