I have an iPad Air with its camera. I need to show a color of my shoes to a person who will dye shoelaces for them. So I need to reliably capture and transfer this color somehow. I assume that simple photo is not enough because of monitor color profiles and calibration differences. I thought of using some "colorimeter" app for iPad and extracting a color hex code. Is it a feasible idea? What else can I do in my case without professional equipment?
Answer
iPads [in fact most mobile devices] tend to be a bit 'over contrasty' unless you actually calibrate the screen with a hardware colorimeter; which probably means that even on your own screen the colour will be wrong. It will also vary depending on backlight brightness & surrounding lighting conditions.
Sending that value to someone else, who also has a non-calibrated & potentially over-contrasty screen, in an uncontrolled backlight/ambient light environment, just multiplies the potential for error.
Your only real viable solution, so you both know you are seeing exactly the same thing would be to print varying samples of the colour until you can clearly see, in good light [cloudy daylight may be the closest you can both get to being the same value], that it is a true match... then post it, snail-mail.
Alternatively, both of you would need either professional Pantone swatches... or at a push, find a paint swatch at a local DIY shop, if you both can source the same paint manufacturer locally [or, again, post it].
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