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Re: response- CRT paper


You quote the CCDs in the new still cameras as 1024 x 760 for aproximately
$300 US dollars. I checked out the newest CCD cameras with progressive 1280
x 1024 pixel resolution. They can be found in cameras for under $900 US
dollars. This means that what some of the TIG group members saw at the TI
demo in Glendale, CA is that type of resolution on a 47 foot screen. A good
percentage said the demo was great. Like Bill Hogan said in his report on
the TIG, DTV is here. To think of anything less than 1920 x 1080 transfers,
be it film to tape or 2K data-scans, HDTV is BIG SCREEN TV.

It has been pointed out at the 140th SMPTE Technical Confeence by a couple
of authors that a 19 inch monitor viewed at 4.5 to 5.5 feet for SDTV has
the same resolution as an HDTV picture at the same 4.5 to 5.5 feet viewing
distance on a 100 inch diagonal screen. Thats about 4 times larger screen
with a 30 degree viewing angle as opposed to an 8 degree SDTV viewing
How close do you sit in front of you SDTV monitor? What viewing angle do
you have? If it is less than 8 degrees for SDTV then you are not seeing the
whats in the picture. For HDTV the viewing angle should be no less than 30
degrees or you are kidding yourself. It will definately show up on the big
wide screen.

The impact that DTV will have on telecine suites in the not to distant
future will be the need for bigger viewing screens. A couple of post houses
have installed Stewart screens of about the 7 ft x 5 ft varity but I've
also heard that some telecine/colorists refuse to use that screen for
proper evaluation of the big picture. Most likely the projector is not up
to todays level of performance. There are some new projecting techniques
that will have a great impact on the critical viewing of big screen
material. Namely the Microdisplays such as the DMD, D-ILA, and LCD to name
a few. There diagonals are only about 25 mm to 33 mm but the pixel count is
is very high and getting higher. These microdisplays will produce very big
images by projection. Gray scale tracking, colorimetry, registration, and
linerity are impressive. Contrast has been a problem but today most display
devices are limited by the 8 bits and not by the projectors. This means the
need for 10 bit transfers. 

Most of the developers of Reflective Liquid Crystal Display (RLCD/CMOS)
devices already have demonstrated 1280 x 1024 imagers and predict 1600 x
1200 by the end of this year. Next year, even higher-definition offerings
are promised. The commercial availability of DMD and RLCD/CMOS displays are
available from more than 10 producers of big screen projectors. This will
accelerate the introduction of several new classes of rear/front projection

In a paper given by Silicon Light Machines they stated they have a
laser-scanned linear diffractive grating array with 1920 x 1080 pixels and
more than 250:1 contrast ratio. That's about what the average print in the
theater has now. Kodak has introduced some new print stock with a Dmax of
about 5 instead of the old 3. 10 bit log is a must for the future.   

Jim Mendrala
Real Image Technology Inc.
mailto:J_Mendrala at compuserve.com

Thanks to Bill Topazio and MTE for support in 1998.
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