Digital BW, The Print

I wrote about this sometime in the past, but could not find the post...


All of the current measuring devices have an limit of 2.5D for the dmax accuracy. It takes an extremely expensive device to measure past 2.5D from a reflected target. Once upon a time someone at Xrite explained exactly how little light is reflected at 2.5D, so it takes a far brighter source that we currently have in any current devices unless I missed a change in the last year or so. My memory is a little vague here, but I seem to remember it was less than 0.1 percent reflected light for a 2.5D and something like 0.01 percent reflected for a 3.0D, but I might have the decimal in the wrong place. Mr. Tobie can probably correct this for me when he reads it as it might be 0.01 for 2.5D and 0.001 for 3.0D.

What I'm saying is that any value that approaches 2.5D automatically gets taken with a grain of salt.