Reload won't separate

[wizard509]

If you put each color on a new layer, then you can export PNG > Options > Export each layer to new file

Depending on the pixel size of the image, you can use Window > Show Printer Colors > Show Cyan (make screenshot and put on Cyan layer, and repeat this for the other three colors. And then export PNG each layer a new file.

But the image has to be 96dpi (1:1)

Thanks, GP good tip.