Quote:
Originally Posted by MDJ87
On that site to check the brightness, how clearly are you suppose to be able to see the numbers? I can see them its just pretty hard.
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That pattern has a background of RGB level 0 (0% in Computer levels). Then the numbers 1, 2, 3, 4 correspond roughly to 1%, 2%, 3%, 4%, of level 255 (which is 100% white in Computer RGB levels), and the numbers 1, 2, 3, and 4 there are at Computer RGB levels 3, 5, 8, and 10 respectively.
This pattern has the opposite end of the scale: The whites:
http://sr-388.net/images/patterns/Contrast.jpg
This one has a background RGB level of 255 (100% in Computer levels). Then the numbers 99, 98, 97, 96 corresponding to 99%, 98%, 97%, 96%, of level 255 (which as I said above is 100% white in Computer RGB levels), and the numbers 99, 98, 97, and 96 there are at Computer RGB levels 252, 250, 247, and 245 respectively.
If you load these 0,1,2,3,4 - 96,97,98,99,100% / levels 0,3,5,8,10 - 245,247,250,252,255 jpgs to your PS3 via a usb stick they are still in Computer levels and if you have your PS3 RGB output set to Full, these jpegs will remain at Computer levels.
If you set your PS3 to Limited their 0-255 values will be remapped to 16-235 at the output and the numbers will become Video level
percents.
On Video RGB levels, black (0%) is level 16 and white (100%) is level 235, so all those numbers in those two jpgs would end
below video black and
above white if they were
not converted to Video levels when the PS3 RGB output setting was set to Limited.
With Blu-rays videos, on the other hand, if you have set the PS3 RGB to Limited, Blu-ray Video level 16 remains RGB level 16 and Blu-ray level 235 remains level 235. So if your TV expects video RGB levels, you should set the PS3 to Limited and calibrate level 16 to be black on the monitor and calibrate level 235 to be white on the monitor. On the other hand, if you set the PS3 to Full it remaps the Blu-ray's video levels (expands the contrast) from Video levels to Computer levels: Video level 16 becomes level 0 and video level 235 becomes level 255. If your display expects computer RGB levels, for example a computer monitor, you should set the PS3 to Full and calibrate the "new" Blu-ray level 0 to be black on the monitor and calibrate the "new" Blu-ray level 255 to be white on the monitor.
In summary: When the PS3 is set to Full, the jpegs numbers show computer level % and go from 0-255 and Blu-ray video is expanded from 16-235 to 0-255, so that setting should be used with displays that expect full 0-255 computer levels
When the PS3 is set to Limited, the jpegs numbers show video level % as their range is compressed from 0-255 computer levels to 16-235 video levels. Blu-ray video 16-235 levels are mantained, so this setting should be used with displays that expect video levels. On the brigthness jpg, Computer RGB levels 3,5,8,10 then become Video RGB levels 18,20,23,25 for example.
A PLUGE with "above black" and "below black" stripes on a video color bar would be above and below the Video level 16 (0%) black (Computer level 0 in Full). If it's a -/+ 4% PLUGE, the "3 stripes" (below/black/above) would be at Video RGB levels 7/16/25. When remapped to Computer RGB levels they would be at "new" RGB levels 0/0/10.
On that Brigthness.jpg, "4" corresponds to this 4% PLUGE
On a image of 2.2 gamma slope, theoretically a 4% PLUGE (video level 25 or computer level 10) should be 1200 times darker than a 100% white (video level 235/computer level 255) but that's dificult to achieve with most displays.