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I'm not a pro but I often use Photoshop Express and Lightroom for photo editing. Plus I found many useful apps for iphone that can help to invert colors on a picture here https://skylum.com/how-to/how-to-invert-a-picture-on-iphone. Never thought it could be so easy to do. There are several fantastic photo-editing capabilities in iCloud Photos and all of them are described in the article. Useful blog for photographers and newbies.