Part 5: I should start by saying I have covered the topic of using graphic arts densitometry to evaluate inkjet proofs once before. Back in July ’05 GN#5 addressed this same issue so you may wish to refer back to it. I considered changing this topic, because the title is a bit inflammatory. … [Read more...]
#26: Density is king
Part 4: TVI is not measured it is calculated from density which is king. All the other values our modern densitometers display are simply calculated values from the densities the instrument measures. In short, all a densitometer does is transmit a predetermined amount of light and then measure how … [Read more...]
#25 TVI Notebook (part 3 of 5) TVI is not a bad thing
Part 3: TVI in and of itself is not a bad thing: Back when TVI was called Dot Gain, I remember going into print shops and having pressman tell me “No, we don’t have any dot gain.” This was not ignorance (they knew they did), but instead a misconceived notion that TVI was a bad thing. I always … [Read more...]
TVI Notebook (part 2 of 5) GRACoL & TVI
Part 2: GRACoL 7 appears to be taking our pressrooms in a direction where TVI will be significantly less importance in monitoring production run stability. Instead GRACoL 7 is based on maintaining gray balance utilizing density and L*a*b* values. Over all, I feel this is the right direction to go … [Read more...]
#23: TVI is a better term than Dot Gain
This is Part 1 of a 5 part series from Jim Raffel’s TVI notebook. Part 1: Tone Value Increase (TVI) really is a better term than Dot Gain: My short answer for this is that a densitometer (or spectrophotometer acting as a densitometer) does not actually measure dots, so how can we really call it … [Read more...]
Golden Nugget #5 Density & TVI or L*a*b?
This post now appears as Color Conversations: Density & TVI or L*a*b? on Color Conversations the blog of ColorMetrix Technologies, LLC. *** Introduction *** Next, I want to let you all know that since the inception of the golden nuggets idea both of the Mikes at ColorMetrix (Michael … [Read more...]