This is a follow-up to the discussion in this note.
What I want to do
I want to use glow in the dark paint to calibrate camera color sensors. In this experiment I wanted to test whether it would be feasible to do (i.e. is the paint bright enough for the camera to pick up).
My attempt and results
I photographed the green paint found in Palmer 12-Pot Fluorescent Glow in the Dark Set applied to a white sheet of paper. Other colors did not appear to be as bright so I thought green would be a good starting point.
I charged the paint using sunlight. I did not make any effort to ensure the maximum charge. It is possible that I could have gotten a better charge by using a more intense light source, angling the paper to face the sun directly and charging for longer periods of time. This is a photo of the paint while it was charging:
Next I photographed the paper using a Samsung Galaxy S3 with +2 exposure in a very dark room (there was some ambient light from outside the door):
I am unable to make out any green glow in the original picture, however, I when applied Aviary's Auto-enhance filter to it green blobs appeared:
- Is the paint bright enough to effectively do calibration? I think it might not be since the intensity of each channel might only range from 0-2.
- Are there any camera apps that allow longer exposure times? In the live preview mode?
- Could I spatially average the pixel intensities to get a more precision in my measurements?
- Try to get the paint to glow with greater intensity.
- See if other colors will show up.
- Create a rainbow glow-in-the-dark calibration card and see if I can use it to calibrate two different cameras so the colors in a reference scene match up.