Originally Posted by ellisda1
Re: patch generators. With lots of options to mirror a laptop wirelessly or cast PC screen to display, what are the chances that the mirrored patches are "reference" quality? I'd guess that the internal PC processing is bypassed, but that's only a guess.
Hi, to be sure about your patch generation, Amazon FireTV/Stick is better option, it can work with CalMAN MobileForge or using LightSpace Connect.
FireTV/Stick outputs RGB signal and it's looking your display's EDID to decide what levels to display; 16-235 or 0-255. (New Fire HDR can output YCbCr also, as user shoman94 posted.)
Because the end user don't know what it will happen with each TV model, CalMAN has one setting to enable/disable expanding Video to PC Levels (for some displays this need to be enabled, for others it need to be disabled) while LightSpace has option to set patch scale 0-255 or 16-235.
To find out which setting is correct for your current display it to compare a grayscale run from your BD-Player or Media Player you use to playback movies and compare the grayscale readings you get from this option enabled/disabled; see your peak black level/ peak white readings also to have agreement.
You can see there how off your measurements can be with wrong settings: http://www.spectracal.com/forum/view...&t=5869#p39542
Also before starting any calibration you have to use a calibration disk to check/set your contrast/brightness/sharpness and check color clipping also.
FireStick when it's been used to generate patterns for video levels is compressing 0-255 to 16-235, so it can generate any RGB Triplet combination between 16-235 range, not 0-15 or 236-254.
All below 16 steps (1-15 are becoming 16 and the all above 235 (236-254) steps are becoming 235, so it's impossible to set contrast and not able to check if you have correctly setup your black level without lifting/clipping your black or near black.
About Contrast is a problem also, since you can't see if you have above reference white clipping or if the above reference white levels have neutral shade and not pink-ish, green-ish etc..
You will still need a calibration disk to set or check Contrast/Brightness in a setup that you will use later FireTV/FireStick as a pattern generator.
If your actual player is shifting the colors to it's output due to it's internal video processing or colorspace conversion and you can't match the measurements you have with any external patch generation then you have to calibrate with patterns with a calibration disk from your player, to correct/count these errors the player is introducing to your calibration adjustments decisions.