QTR-Quadtone RIP

Hello Sidney,

Lab readings don’t work like density readings. You do not want to alter the Lab readings in the manner you mention, that would render the readings meaningless for linearization or any other purpose. There is no zeroing out to paper white with a spectrophotometer, you can only calibrate to the instrument’s calibration tile to ensure accuracy. The linearization software understands this and takes it into account.

What you do want to do is be consistent in your measurement technique. Always measure over the same neutral white backing, always calibrate before measuring, average multiple readings when possible, keep the spectrophotometer’s aperture and calibration tile free of lint and debris, use consistent movement with scanning spectrophotometers like an i1, etc.

The few times I’ve had unsatisfactory results using a spectrophotometer for linearization it’s always been because of a measurement error on my part or a problem with the print I measured.

Best Regards

Oz