Originally Posted by Tucker Smash
When looking at your color ramps vertical and horizontal, what am I looking for? Is it just a smooth gradation of color that I want?
There 2x Color Ramps Horizontal/Vertical, you can find them to the Color Reproduction Page 5.
There models from Sharp/Toshiba/LG, were they have problematic CMS controls, they are not designed well, each CMS setting has its own 'safe working range' (for example +-2 max) where you can adjust without to introduce to you issues with real content. Even specific combination of adjustments between different calibration controls can introduce banding/posterization/false contouring/noise/distortions/no smooth gradation, clipping etc...
When you performing CMS calibration, start with Primary Colors, and when R,G,B promaries are fine, then move to secondary colors.
But always check if there issues with gradation after the CMS or grayscale adjustment, using gray/color ramps patterns.
After the end of your grayscale adjustment display a grayscale ramp pattern to see if there no any strange color tint and that your grayscale gradation is OK.
Then before starting your CMS adjustments display a color ramp (look here an example of issues
) to see about your color gradation and at this stage change randomly some CMS adjustments controls to see if they are introduce any error to your color ramps, if you see that all are fine (until at a specific adjustment range +-5 for example) reset the CMS and then start your measurements to improve your CMS. At the end of your CMS adjustments display again a color ramp pattern to see that all are fine, then recheck again your grayscale for micro-adjustments.
There some LG models where their 'Luminance' controls are adding some issues, see there an example: https://www.avsforum.com/forum/40-ol...l#post45436297
For that reason you have to always check color gradients/ramps after performing adjustments and then using actual Blu-Ray movie content.
A good pattern to quickly reveal issues before spending some time with real movies and while you have your meters connected and calibration software open to decide quickly what to do next...are these Color Ramps Vertical/Horizontal patterns, BTW Vincent from HDTVtest.co.uk are using them also (see 5:11):
Because of these issues coming from poor design of CMS processing (or complex/huge usage of calibration controls); by only looking the post-calibration low dE numbers is not enough to guarantee to you a successful calibrated picture, for that reason, calibration 'art' is required, beyond instruments and measurements, to make these displays look and measure good the same time.
Here are some user findings testing these patterns:
About your CMS adjustments, beyond charts, take a look a these gradation pattern with CMS adjustment ON/OFF to verify that no issues are introduced by using these controls.