The original idea was to put a target on the screen to make it simple for a person following the SMPTE ST 196M-2003 Standard to make a consistent measurement (which says: "Luminance of the screen sides and corners shall be measured at a distance of 5% of the screen width from the screen edges...") That means that a person in the proper place in the auditorium could/would/should shoot...or aim to shoot...at different designated spots on the screen, 5% in from the edges and corners.
And because a solid white screen has a lot of glare, a dot was specified in the Study Group instead of a completely white screen, so that measuring tools could minimize the glare.
Another concept that was incorporated was that a long room might need a large dot - specifically a 20% of height dot instead of a 10% dot so that any room that was too long could give the measuring person an excellent chance of getting only white in their tool's 2° measuring spot. To accomodate that, the positioning line was placed 15% in from the edges, thus a 20 percent dot could sit on the 5% edge of the screen.
Then, allowing for simplicity, the smaller dot should be on the same line that was indented 15% in...because...who knows. Except that you can't measure the reading of white at 5% from the edge of the screen.
So, that is why you should remember that these are only for testing, not real live finished products. And, remember: these are 2020 4K 16 bit TIFFs.
We ain't the bad guys...we wouldn't know how to keep anything about you~!
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.