Support

FAQ

    Inspectors » Color Inspector » Snowflake - Spot Color Tolerance » Snowflake Distribiution Roundtrip
    March 31, 2022

    Snowflake Distribiution Roundtrip

    The user may only change how big is the step or each axis L, a, b independently.

    In most cases we advice to  start with a* axis then apply lower value for the L* axis  and higher for b*axis

    Due to the human perception in many situations different numbers produces similar visual difference

     

    Please note that in some situations too big a step may exceed the output device gamut. In such a situation, the user may reduce steps or try to reproduce color on the divide that offers a larger gamut. 

     

    Roundtrip ΔEab (gamut warning)

    This is a limit definition that trigger warnings in situation where sample is out of the gamut. Out-of-gamut patches are outlined.

    Roundtrip 0.3, 16-bit   Roundtrip 0.3, 8-bit
     

    Important note:

    If you are working using 8-bit workflow some samples are not able to be addressed very accurate and the value might be visible!. Depending on sample and gamut ΔEab can be > 0.7 and that might exceed user expectations!
    In such case switch to 16-bit can be used , but it is important to check if current  print workflow has no limitations and ICC profile is created with 16-bit depth. Also number of cluster used for profile generations is highest and  data optimization/smoothing has been applied without loosing accuracy.

    Conclusion  

    Roundtrip function can check not only if sample is outside gamut , but if accuracy of the addressability match the expectations.

     

     

    Contact ChromaChecker Support

    Additional information and Support Form is available for logged users.