Athlete: Marlon John. Images property of WellNx Life Sciences. Used with permission.
Original photo (not available) had uneven skin tones, caused by Protan. Skin tones were evened and blemishes removed. RGB image converted to four-colour grayscale using channel mixing and curves to get more contrast and detail. An additional image was blended in on the right to serve as background for copy. All black and white images in a 112-page book received the same treatment. Printed sample available.
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