Photography Asked by Harald Kneidinger on March 31, 2021
I have a device with a blue LCD display where the backlight is blue and the letters are white. When I take photos of it with a cheap webcam, you cannot see any letter, because the blue light is too dominant.
Does anybody have a cheap solution to this problem?
Mount a strong yellow filter, the display will image as black and the letters light yellow. If you can find some yellow cellophane X-mass wrapping ribbon or candy wrapping, you can experiment. If you like the effect, then buy a deep yellow photo grade filter. These were common in the black & white era. You can also buy a deep yellow gel filter. These are common in the theatrical stage lighting business. Likely if you look, you can find a piece of yellow flat glass or plastic to test this effect.
Correct answer by Alan Marcus on March 31, 2021
Readabilty issues on LCDs can often be tackled with polarizers without loosing the colour information. You could just hold some cheap polarizer, even a linear, between your webcam and the LCD. Try rotating it up to 90° to find the orientation with the effect you need.
Answered by Hermann Klecker on March 31, 2021
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