Hue can be easily adjusted by Gimp, the open source image editor. Its GUI is similar to Adobe Photoshop, therefore designers can also easily apply some basic tuning via Gimp.
For example, hue adjustment can be done by opening the image, then go to image->mode to change index to RGB, then go to hue/saturation/brightness section to adjust to what you want, then go back to index the modified image, then finally export it to the desired file format.
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