I took a picture of a catamaran cruising down the canal. It would have worked for either Challenge, also the Vehicles one I mean.
In Photoshop; Selective color-
Darkened yellow
Lightened red
Lightened white
Darkened black
Cropped and pasted 14 bright spots out
Used paint brush to darken two areas that appeared overly bright
In Hue/Saturation-
Decreased red
Increased yellow
Decreased magenta
Brightness/Contrast-
Slight increase of both
Sharpened with Unsharp Mask
Resized to 640 long size
Sharpened again to taste
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