Quick comment. I suspected there could be a difference between the IT8.7/4 target printed on a heavily optically brightened paper, such Canon Matte Photo paper, on an Epson printer, measured "fresh" compared with measured "24 hours later"? I measured the print "fresh" yesterday afternoon and again today. The difference? What difference? https://1drv.ms/u/s!AkD78CVR1NBqkLVP0GvK2YbCDLaOXw Can't believe the difference is so small. Best / Roger