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Matching the appearance of existing paint / colored surfaces is difficult.

You need data on the variation of colour, intensity and reflectance as a function of viewing and illumination angles. Not something a mobile device can do.

The device described in this paper can: (note: I am not affiliated; just out of interest)

http://www.pro-lite.co.uk/File/RAD%20Imaging%20Sphere%20Pape...

[Edit: spelling]




If you have an app, and a standard color card[1]. then the processing to normalise the image (and therefore the colours) should be doable on a mobile device.

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[1] https://www.amazon.co.uk/gp/product/B004QXU8VI/




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