Changing ‘curves’ in digital photo editing apps can really change colours and make them ‘pop’. Initially you see a square with a diagonal line on it and also a series of squiggly lines underneath that indicate how much of the spectrum is in what part of the box. If you click on the diagonal line you can change the shape of it. Raising the line by dragging it makes it your image lighter (you can watch the image change as you drag on the line). Pulling the line down darkens the image. But altering the line into a flowing curve also changes the colours without altering the underlying pattern or shapes. You can also change colours in other tools. Have a go. See what happens.