tag:blogger.com,1999:blog-1840985738235902482.post6778334215118634692..comments2024-03-27T07:14:48.488-04:00Comments on John the Math Guy: A spectrophotometric romanceJohn Seymourhttp://www.blogger.com/profile/11350487038873935295noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-1840985738235902482.post-6803642587688906932013-02-12T19:44:43.070-05:002013-02-12T19:44:43.070-05:00Thank you Kate... hearts did you say? Have a look...Thank you Kate... hearts did you say? Have a look at my blog post tomorrow (Feb 13).John Seymourhttps://www.blogger.com/profile/11350487038873935295noreply@blogger.comtag:blogger.com,1999:blog-1840985738235902482.post-8561550930014631452013-02-12T15:56:28.698-05:002013-02-12T15:56:28.698-05:00Knowledgeable with a sense of humor. Now that is m...Knowledgeable with a sense of humor. Now that is my perfect pair and you've got it in spades...or should that be hearts. Kate | Sensational Colorhttp://www.sensationalcolor.comnoreply@blogger.comtag:blogger.com,1999:blog-1840985738235902482.post-886025247237029672013-02-11T03:55:08.073-05:002013-02-11T03:55:08.073-05:00Good work John.
Be a user and not a scientist, I´m...Good work John.<br />Be a user and not a scientist, I´m discussing with several people the issues on inter instrument agreement. I agree with Bob k., that ceramic tiles are far more stable than pint samples. <br />What I learned during my discussions, that some of the ceramic tiles especially the orange tile are reflecting light quite different to paint or print samples. If you compare instruments with differnt construction of the light to detection path - e.g. Techkon and X-Rite, ceramic tiles can be misleading for judging inter instrument agreement for e.g. print evaluation.<br />I am asking X-Rite since years to offer Netprofiler for the i1, but they refuse this idea.Jan-Peterhttp://www.colormanagement.denoreply@blogger.comtag:blogger.com,1999:blog-1840985738235902482.post-26820797837909305542013-02-08T14:51:04.772-05:002013-02-08T14:51:04.772-05:00Hey Math Guy!! Great Blog! I always was a sucker f...Hey Math Guy!! Great Blog! I always was a sucker for a good romance tale! I think the female spectro looks more like Selma Hayek than Jennifer Aniston, though!<br />Hey you users out there, did you take note? YOU NEED TO KNOW about differences between instruments, not just how each one tracks between factory calibrations! Get one of the references John mentions above and be aware of differences. Noting spectral differences between instruments can help you win those arguments that John describes as unwinnable above. Nah, that's impossible! Data never won an argument with a woman!Hutch Hutchisonhttp://www.inthutch.comnoreply@blogger.comtag:blogger.com,1999:blog-1840985738235902482.post-31342891687658179892013-02-08T12:19:10.683-05:002013-02-08T12:19:10.683-05:00Great post, John. Many users see a published inter...Great post, John. Many users see a published inter-instrument agreement as the absolute limit of performance. Unfortunately, "typical user experience may vary." <br />Nearly all instrument manufacturers take pains to describe their methodology for determining inter-instrument agreement, saying that the IIA figure is a STD DEV of average measurements in a fleet of instruments compared to a master (usually virtual) at precise temperature and humidity. Very few user environments match these conditions. <br />Just a note on your experience with standardizing the instruments with BCRA tiles versus Paint samples: While there are some advantages to using paint samples over ceramic tiles, notably less thermochromatic shift and flatness (BCRA tiles are not as flat, so some variation there affects 45/0 instruments,) Ceramic tiles are much more durable as a long term standard. Paint on paper would ideally only be a one time use, while a properly cared for set of ceramic tiles will be usable for a year. Repeated use of the paint on paper sets does degrade the samples over a relatively short period of time. Although I never looked into the cause, I suspect that humidity changes and scuffing from repeated physical contact with the instruments are responsible for the color shift. <br /><br />In brief, paint on paper samples are a good way to check IIA on a small set of instruments if you measure them all at one sitting, but continued use of a standards set really requires ceramic.<br />Bob K.https://www.blogger.com/profile/05168268396885702457noreply@blogger.com