I have used a lot of editors. But I have found the apple inbuilt photo editor is one of the best photo editor for google maps. I have been witnessing that the photo editors are changing the color of things in the picture. But this leads to some difficulty in people getting knowledge about places in google maps. Apple inbuilt photo editor has color gradient adjustments option (not the color changing option) which is very helpful for locating even minor things in the picture. The brightness adjustment option is way natural as in other editing apps.
I myself use the inbuilt Apple photo editor for google maps.