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What I find interesting is they have fine tuned this for skin and hair. I uploaded a brownish croissant on a peacock blue plate, and it said could not process the image! Then I uploaded a photo of a...

I think Larry is referring to Xhris. I did a search and it seems his website link does not work any more.

If the color range is fairly tight, say sky, you can use the Photo Tool > Select Colors to Enhance.

Usually apps that say free, are free to try. They add a watermark that only goes away when you pay for the product.