First, I'd like to apologize to those who feel this discussion has spiralled away from it's original intent. That's why in the following remarks, I've tried to expose my real and actual methods relating to the Behr SS paint being used as a projection surface.
Originally posted by Tom_Bombadil
And so you have conducted controlled comparisons of silverscreen vs a known true gray paint of the same grayscale density and absolutely determined that there is no colorshift? Or do you wish to offer a speculation on that subject?
No, I have not tested against a neutral (zone 5) gray. Also, please, point me to anywhere here (or on any thread on AVS or on the Internet) where I stated that Behr SS was "color neutral". This is your term not mine. You made some interesting statements earlier too, like:
I know the color because I've got color samples.
I've projected onto two different paint card samples of Silverscreen.
Good, how big are the samples? What was your viewing distance of the tests. Many, many, many people more knowledgeable than me here on AVS have stated emphatically that any sample less than (I guess it's about) 2'x4' doesn't give an accurate estimation of performance. Anything less than that is subject to a wider interpretation of the results (unless of course there's a light spectrometer used, which will probably work with that size sample I guess). Do you have a light spectrometer? I've never claimed any of these "color" properties you mention in any of my threads, other than stating my opinion that I think it increases CR based upon my observations of physical testing and the posting of screen shots using facial tones.
I know the effects of having exactly this much lamp black in a paint formula.
I know the effects of having exactly this much red in a paint formula.
I know the effects of having a small amount of raw umber in a paint formula.
You "know" these things. How? Where is your emperical evidence to back that statement up? Your statement of your daughter being an artist is irrelevant to your argument (unless you too are an artist that uses either paint or light, as in photography, as your meduim). You may have played around with the colors, but a 2 year kid doing finger painting is one thing and (to use the wild analogy formula you seem to like) Leonardo DaVinci is another thing.
You stated previously "As I've stated in other threads, this isn't magic, it is science", well, I too understand how science and the scientific method works.
The scientific method is defined here: http://teacher.nsrl.rochester.edu/ph...AppendixE.html
One notable item from the definition is this, "The most fundamental error is to mistake the hypothesis for an explanation of a phenomenon, without performing experimental tests. Sometimes "common sense" and "logic" tempt us into believing that no test is needed. There are numerous examples of this, dating from the Greek philosophers to the present day."
It is this reason I performed my controlled testing under varying light conditions. I even asked my wife to look at it, although she couldn't be bothered to be taken away from her rerun episode of Friends at the time
So proceeding down that path:
I'd like to first clarify my credentials upon which my statements are based (for the benefit of anyone here that might be interested):
I happen to have received a Associate of Science degree in Computer Information Science from Northern Essex Community College '93, a Bachelor of Science degree Computer Science, with a minor in photography, at Northeastern University '98 in Boston, MA. And I've been an amatuer photographer since the age of 13 when I got my first 35mm SLR.
Therefore, I can honestly say "know" a bit about light and it's affect on color, and the interplay of that color on your eyes in different light level situations. My specialty in photography, it was my final thesis for the degree actually, was large format 4x5 night photography. This specialty requires an indepth _knowledge_ of how light behaves and is peceived in your eye at that level as well as requiring a full _understanding_ of the inverse relationship of light level to distance, the reciprocity effect of film at varying temperatures. We also had to _know_ how to calculate the expected effects, predict what the final image would be, and properly process and print the images (large images, smallest being 20x25) and the effect of light at varying distances using color filters, etc...
So, using the scientific method:
1. Observation and Description
Stated earlier as going through the color on the swatches in HD looking for Misty Evening. Not finding it, I searched for something similar, which I came across the Behr SS shade.
2. Formulation of an Hypothesis
Thinking, hmm, this looks similar enough to the Misty Evening shade and it's not that expensive if I have to actually try it.
3. Predict Quantitatively the Results of new Observations
Thinking, I'll bet it has the same properties and will perform in a similar manner to the Misty Evening shade. I'll take 5 swatches to get a big bigger sample piece.
4. Performance of Experimental Tests
I compared the white GatorFoam (blasted out whites and hotspotting was awful) and the (5x swatch) sample of Behr SS. Viewing at both close range and TRYING to see it from seating position at 11' or so, I couldn't really get a good feel for it's performance. _Knowing_ that this size sample wouldn't prove anything to those more knowledgeable than me here on AVS, I must go larger, so I had to pony up the $10.00 at this point and commit to an afternoon.
Using approx 1/3 of the 80x45 surface area for each sample. I used my piece of blackout cloth (which many here start out with as screens, and fares pretty well on its own) as my control since I _know_ it's properties upon the image and it's properties are also familar to many here (a zone 5 grey would also be a good control, I admit, since it is used as a calibration aid in color photography). I proceeded to purchase a quart of the Behr SS to run a larger sampling and comparison test....more "real world" actually. I made a full size 80x45 screen, ran the comparison again to gain EMPIRICAL EVIDENCE.
So, there you have it, my application of the scientific method in my experiments. Can you say the same? Have you done due diligence? After all, you said yourself, "it's a science".