Quick Colour Fix With the Channel Mixer (in Affinity Photo)

The Channel Mixer lets you say 'where there is colour X, change colour Y. For example, 'where there is blue, add green', which we use here to make the magenta shirt white. Hmm. Sounds tricky? It's not, really. It's also really quick and easy to do.
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[@mikeroberts1281]

Many thanks. It was hard to understand why you would use the channel mixer until now.

[@Goldmangun]

Very helpful, thank you!