Have an image which is (basically) greyscale, white on black. I want this to be green on black instead.
This answer seems close, but I cannot get it to work. I probably do not understand steps five ("Make a new file with only the color you need") and six ("Make a Layer mask"; not sure which options to use, and there are no "channels" available).
I understand I can manually repace each individual shade, which does seem practical but would take some hours. I'd rather do it in one operation.