Warmth and coolness can both be achieved in your mobile photography with a few tweaks, and there are apps for your smartphone that can help you during the editing process as well. Color plays a large role in the perception of your mobile photos. Reds, yellows, and oranges can help you develop a sense of warmth in your images. Greens and blues are ideal for adding depth and coolness to your mobile pictures. Depending on what you want your viewers to perceive, here are some tips for developing both cool and warm photos.