Ben Goren wrote:
Graeme, might it make sense to add an option to chartread that will remember each of those start / stop white values, average them all together, and replace every white patch in the chart with that value?
For strip type instruments you're right that paper gets measured at the end of each row. The problem is that because the paper isn't delineated by spacers, it's difficult to know what is valid paper and what is not. Conceivably someone could read a strip such that there is just a spacers width of white at the start and/or end, and the normal patches would be read fine, but there wouldn't be enough white for a valid reading. So some tricky heuristics would be needed to try and figure out what is valid white and what is not, and if it goes wrong, you've got a bodgy white value to mess the profile up. (And this would only be possible with the i1pro and Munki). So at the end of the day, it seems to simpler and more reliable to put all the instruments on an equal footing, and only measure values from formally defined patches. [There are in fact bigger "white" problems to solve for input and display readings. For input targets taken with a camera the illumination may be uneven. For LCD displays, the brightness can change significantly as they warm up. It would be good to be able to measure extra whites in both of these cases and compensate the readings accordingly. ] Good idea though. Graeme Gill.