On Mars the rovers carry colour calibration targets. This allows the images captured to be adjusted to the correct colours depending on the light conditions and the colour response of the cameras.
At my favourite hardware warehouse I found a colour calibration card for use with mobile telephone cameras. It is a card with various colour squares and a grey scale and raised ridges. These characterise the light source and the camera response. In the centre is a hole for the colour to be matched.
The card is stored in a sleeve to protect it from abrasion, staining and fading.
The trademark on this card is Coloursmith and there is a mobile phone app to go with it to produce a colour matched paint.
This card could have applications for recording science.
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