grayscreen sample shots - AVS Forum
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post #1 of 4 Old 01-07-2001, 04:09 PM - Thread Starter
KBK
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Here's a few grayscreen sample shots to ponder....

What the background is, is a CRT1.6 painted vynil screen, being used with a CRT system.

The sample in the middle is a slightly color-corrected gray on the left, vs. a standard gray on the right (there are two paints on the sample. To top it off, there is a slightly different texture to the finish on the two different samples.

This is why... results may vary. Once you are painting an entire srceen, the results will be uniform. The best results will be obtained after one has done many screens, or if the painter is familiar with spraying systems.

http://goosystems.com/grayred.jpg
http://goosystems.com/graygreen.jpg
http://goosystems.com/grayblue.jpg
http://goosystems.com/grayknockout.jpg
http://goosystems.com/grayclose.jpg
http://goosystems.com/grayfull.jpg

The rgb screens were obtained by using the ASUS VGA card software's built in test patterns.


Pardon the lack of seriousness of the shots. You can also see that the vynil keeps trying to curl at the edges. There is also a line about 1/4 of a way in on the left side of the sample, that is a slight fold mark from the sample sitting on top of a gp-3000 projector for the last week. There is way too much stuff in my living room... You can see the outline of the rest of the gp's venting area if you know the projector's shape...


Notice the response of the gray to blues. It tends to be a characteristic of any gray mixture, due to the physics of the situation.


[This message has been edited by KBK (edited 01-07-2001).]

Ken Hotte

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post #2 of 4 Old 01-08-2001, 05:54 PM
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KBK, what I would like to see is how the yellows compares to the grey screen using a white screen as reference. Could that be possible?

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post #3 of 4 Old 01-08-2001, 09:23 PM - Thread Starter
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Here's one that should help a bit.....


http://www.goosystems.com/grayscalegray3.jpg


Here's a bit more information about the grays on the Macbeth Color Chart (called the Muncell Color Chart), from left to right: White--(0.5), neutral 8(.23), neutral 6.5(.44), neutral 5(.7), neutral 3.5(1.05), black--(1.5). The numbers in the brakets are the optical densities. The numbers that are not in the brakets are the neutral density numbers.

[This message has been edited by KBK (edited 01-09-2001).]

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post #4 of 4 Old 01-09-2001, 08:42 AM - Thread Starter
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Due to the incredible variety of projectors out there, and the incredible variation of conditons that they will be placed under, it will quickly come to one's attetnion that thare can be a REFERENCE type screen availible, but it will only be exactly right under reference conditions. This is why I have stated that we will be producing more than one variety and type of gray paint for the digital projector market. The price of this product makes the fact that the screen is centered for it's immediate enviroment less of a problem than it would normally be. You move, or sell the projector, well... sell the screen with it, see if the old screen works with the new projector, or just make a new screen (or have one made by a competent sprayer of your aquaintence..). It gives you a reason to head on down to the ole' A/V-home theater shop..... and possibly look at more stuff you shouldn't be buying (but you must!...)

It allows you to get to the best black level that you can, which is critical in getting the most out of the immediate projector in question. More than anything else, there's the rub.

Ken Hotte

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