Replace one color with another.

[Mark F]

Hi,

I start with an image of a blue t-shirt on a white background. I want to replace the white with the transparent color.

How can I achieve this?

Thanks

Mark.

[Brian Salomon]

You could write a custom SkColorFilter using SkRuntimeEffect that looks at the input color from a drawImage and does the color transformation that you want. Simple version would be something like this:

https://fiddle.skia.org/c/8d599d7bec816c8e0791619b49ad9879

(This doesn't actually run on fiddle.skia.org but does run work when building Skia locally)

Brian

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[Brian Salomon]

Here's a working fiddle:

https://fiddle.skia.org/c/efe351e6dea2ce309b45f3aba483f324

[Mark F]

Hi Brian,

Thank you very much. Skia is an awesome library.

Mark.

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