Two issues

[jcalcina]

The background wall layer is a solid purple with CC Threads to make this texture. So the colors get divided into two. Are these considered the "Channels"?

I want to manipulate the dark area, but I seem to be able to only manipulate the purple "hatches", one half of the colors of the layer. Is there an effect to do that? Thanks.

[Dave_LaRonde]

Sorry, your picture doesn't show up.

But to answer your question, a channel refers to a color channel - red, blue, green and ALSO Alpha, which is a transparency channel.

[OussK · Accepted solution]

If you use CC Threads, so the dark area is a alpha channel (transparency) so you can set a new solid under the solid purple and use any color you want.

[Vishu_Aggarwal]

As guided by OussK, you can just put a solid layer below the CC threads layer to control the background colour. Please refer the screenshot below -