Microfading Tester International Discussion Group

 View Only

  • 1.  Color temperatures for testing

    Posted 2 days ago

    I appreciate the MFT-IDG group for this discussion platform and the webinars.

    I have questions about setting color temperatures and using them. Are the tests conducted at a single-color temperature, or are they conducted at two or more different temperatures? Do the results differ? 



    ------------------------------
    Shiho Sasaki
    Conservator, Asian Paintings and Paper
    Asian Art Museum
    San Francisco
    United States
    ------------------------------


  • 2.  RE: Color temperatures for testing

    Posted yesterday
    Hi, Shiho,

    I am sharing my understanding here.  I think what's more important than CCT is the light profile that will be used for the final display, which is somewhat correlated to the CCT of the light source, but not always exactly.

    If the display will be using daylight through UV filtered windows, then the light profile of UV & NIR filtered Xe-MFT is the best simulation, which typically has a CCT around 5000K in my Xe-MFT (it still has a very small amount of UV and violet component).  Today's LED can achieve the same 5000K CCT, but if it is achieved through "blue pumped LED" technology, it is not exactly the same light profile, since it has zero UV and violet component but with a very strong blue emission at ~450-470nm. 

    If the final display will be using warm-white LED of CCT = 3000K or 2700K, then the light profile of a LED-MFT of the same CCT will be the exact fit.

    I hope the above helps!

    Henry Duan



    Original Message


  • 3.  RE: Color temperatures for testing

    Posted 2 hours ago
    Dear Shiho

    Are you asking about the color temperature of the light source you're using for MFT,  or the color temperature used to calculate the dE* results? 

    Either way, yes, the color temperature makes a difference to the results. However, it does  not usually make a difference to the ordering of results. That is, for reasonably continuous spectrum sources, more light-sensitive materials  (in general) test as more light sensitive than less light-sensitive materials, regardless of color temperature.

    JP

    JP Brown (he/his)
    Senior Conservator
    Vice-Chair MFT-IDG

    t: +1 312 665 7879
    f: +1 312 665 7193

    Field Museum
    1400 S. DuSable Lake Shore Dr.
    Chicago, IL 60605



    Original Message


Related Content