He altered the colors with photo-retouching software.
图片的色彩是他用照片处理软件修饰过的。
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Professor Hany Farid, a computer scientist at Dartmouth College in New Hampshire, and his PhD student Eric Kee, have been investigating photoretouching.
The GIMP, or GNU Image Manipulation Program, is a freely distributed piece of software suitable for such tasks as photoretouching, image composition and image authoring.
或者说是 GNU Image Manipulation Program，是一个自由发布的软件套件，用于照片润饰、图像合成和图像创作。