Originally Posted by AdamAttewell
I have the media files version of you calibration disk but until this point I have been using an Amazon Fire TV with SpectraCal's MobileForge as my pattern generator when performing meter profiling.
Isn't using MobileForge the same as manually displaying the patterns with the disk?
Hi Adam, what device you used with Mobile Forge? MobileForge is just a software generator, it doesn't guarantee to your that you have correct RGB triplet output, it's unknown what the device will do to its output when it will take command from MobileForge to generate patterns.
Not all devices have accurate output, for example Chromecast is adding a lot of errors to gamut measurements (from the conversion of RGB -> YCbCr), FireStick/TV is the most accurate option for CalMAN.
FireStick outputs RGB signal and it's looking your display's EDID to decide what levels to display; 16-235 or 0-255.
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.
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.
Setting Contrast is a problem also, since users can't see when they have above reference white clipping or the above reference white levels have neutral shade or 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 FireTV/FireStick as a pattern generator.
It's more accurate approach to use a calibration disk for pre-calibration settings and then use later for the color patch measurements the MobileForge.
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.
If you have confirmed from testing that the MobileForge solution you are using is matching the output of your player (stand-alone players can have accurate YCbCr output), then you can use MobileForge as patch generation and the calibration disk for pre-calibration and visual post-verification of color-ramps/clipping etc.
Pay attention to all these when you are using software pattern generation: https://www.avsforum.com/forum/139-di...l#post56121138