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Re:Unsplash – Beautiful photos free to use under the Unsplas... by wavefunction on Sunday November 06, 2016 @08:08PM (#12888108)
You could color-sample the pictures displayed on the fly with a library like color-thief[0] and render the text in some acceptable contrasting color. We do something similar for a bit of our app that allows the users to set color schemes.

[0]http://lokeshdhakar.com/projects/color-thief/

Re:Unsplash – Beautiful photos free to use under the Unsplas... by cyberferret on Sunday November 06, 2016 @08:15PM (#12888132)
Nice library! All javascript too. Thanks for the heads up - will certainly make an interesting project to use this to calculate the text colour for the error screens.

In fact, I may be able to go back to using coloured Unsplash images. I went for Grayscale images purely so that I could stick to white text for the contrast.