The order of edits from crop and level to exposure, color and local tweaks, how to read a histogram, and signs of overediting. Protecting the original comes first.
The point of editing is to bring a photo closer to the scene you saw, or to make an intended mood a little clearer. It works best for fixing what the camera missed: a tilted horizon, a face that came out dark, the yellow cast of indoor light. On the other hand, shake blur, missed focus and a sky blown out to white are hard to rescue. That is why people who edit well work hardest at reducing failures while shooting.
Many phone photo apps record your edits separately so you can revert to the original at any time. But a copy exported to another app or sent through a messenger is a separate file with the edits baked in. Standard photo formats use lossy compression, so opening, editing and resaving repeatedly lowers quality bit by bit; it is better to always start edits from the original. If your phone can shoot in RAW, you get much more room to change brightness and color, but bear in mind the files are large and always need editing and conversion.
Following an order saves you from redoing work. Settle the big picture first, then move to details. Menu names differ between apps, but most have the items below.
The mountain-shaped graph in editing screens or camera settings is the histogram. The left end of the horizontal axis is pure black and the right end pure white; the height shows how many pixels have that brightness. If the graph presses high against the right wall, highlight detail has been clipped to white; if it presses against the left wall, shadows have blocked up into black. There is no correct shape. A snowy landscape naturally leans right and a night scene leans left. What matters is whether the parts you want to keep have been cut off at the edges.
When photos under indoor lamps look yellow or shots in shade look bluish, adjust the temperature and tint of the white balance. If the photo contains something that should be neutral, such as white paper or a gray wall, making that area neutral is the easiest reference. For photos of people, use natural-looking skin as the final test. People are especially sensitive to small shifts in skin tone, so a color change that seems fine in a landscape can feel wrong on a face.
As you edit, your eyes adjust and you push harder and harder. When you see the signs below, step back one notch. Toggling between before and after, or taking a break and looking again, is the best check.
The same photo looks different depending on screen brightness, night-time color filters and display type. Edit on a screen at maximum brightness and the photo tends to look dark on other devices; match colors with a warm eye-comfort filter on and you end up making the photo too blue. For photos where color matters, turn off color filters, edit at normal brightness, and open the result on another device too. Exporting web photos in the common standard color space keeps colors more consistent across devices.
Significantly reshaping someone's face or body in a photo and publishing it without their consent can upset them and lead to disputes. For photos where the real condition matters, such as items listed for resale, avoid edits that hide color or scratches if you want to keep trust. Object and person removal tools are convenient, but as a rule do not use them on photos that serve as records or evidence. The basic rule is not to present an edited photo as a literal record.
Each button runs this keyword on that search engine