Re: CMYK or RGB device
Re: CMYK or RGB device
- Subject: Re: CMYK or RGB device
- From: Robin Myers <email@hidden>
- Date: Thu, 1 Jul 2004 23:17:11 -0700
On 1 Jul 2004, at 21:32, Graeme Gill wrote:
Robin Myers wrote:
projectors and LCD panels would qualify as RGB devices. Sometimes if
the choice is between RGB and CMY color production systems, RGB comes
out the loser. In an effort to make brighter LCD screens, many
manufacturers have investigated using CMY filters for the reason that
more of the spectrum is transmitted than with RGB filters.
More spectrum == brighter & less saturated.
I would imagine that most LCD screens get good saturation and
reasonable
brightness because they are backlit with fluorescent lighting, that
emits bright, (relatively) narrow band RGB, even though the LCD
filters are
broadband filters.
You forget that there are at least three polarizers at work in an LCD;
the polarizer, the liquid crystal material, and the analyzer. If each
polarizer was 50% transmissive, the result would be 12.5% light
transmission available for the filters. The actual transmission is
usually less than 50% so the loss is more severe. The CMY filters were
an attempt to compensate for the low transmittance through the
polarizers. The CMY filters in the panels I used were also in three
layers, not adjacent as is done with RGB filter panels. The additional
manufacturing costs, not the color saturation was the reason for the
CMY filter method not being widely implemented.
Robin Myers
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