It depends on the exact field you're referring to (you categorized this under Arts, which is a bit confusing), but one answer could be resonance.
Answer:
apply a Gradient layer
Explanation:
Clicking the Gradient button in the tool options brings up a Gradient Select window, allowing you to choose from among a variety of gradients supplied with GIMP; you can also construct and save custom gradients.
Answer:
where is image I can't see it
