robert@xxxxxxxxxxxxxxxxxx wrote: Hi,
If I do repeated tests after setting a reference, the dE94 starts off at around .005 and creeps up to around .02 over 15 or so readings. Moving the instrument changes the reading up to .25 max (over a 3cm square. Changing to the reflective read adaptor (without recalibrating) doesn't seem to change things much (still around 0.3 max).
Sounds pretty typical. Ink and paper aren't that uniform.
Going back to my original question: could the error I'm seeing have to do with the white point? If I measure the paper white using spotread I get a value of 97.74, 0.2, -0.59, whereas xicclu gives 100.000000, -0.000062, 0.000060 for RGB of 1,1,1 (or a dELab of about 2.3).
Well, one sound like it is absolute colorimetric, and the other relative. You need to keep them the same to be able to compare them. Given you are using spotread, then you need to use "xicclu -ia .... etc." Graeme Gill.
