4. Grayscale rendering
Today's plasma screens are capable of displaying 8-bit video levels for each color (red, green and blue), giving us 24-bit image rendering. However, these screens don't allow light to be modulated in an analog way, as a CRT would by modulating the intensity of the electron beam.
The operation of a plasma cell depends on a discharge threshold: if the voltage in the cell is sufficiently high, a UV discharge will occur, otherwise the cell remains inert, with each discharge producing the same light intensity.
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Grayscale rendering
Contouring effect
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