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I assume you're not talking about wet ink that hasn't set or dried completely yet. This is occurring on the actual bare paper itself. There is no press applied AQ or WB coating. The paper is coated gloss, dull/matte/satin? Are these normal production sheets or special customer samples?

Every plate should have a QC scale (1x1 pixel) on it and both prepress and press should be trained on how to interpret it (which curve applied). YES, prepress and press have traditionally fought like cats & dogs. I think it's because of lack of management improvement process into solving...

Digital inkjet proofs can be very accurate if the correct ICC profile and base proofing media are used with color management. Results from IT8.7/4 target (n=1,617 patches) are average Delta E'00 < 2.0 for proof and average DE'00 <3.5 for press. Have you asked both your prepress proof supplier...

In the US, most digital proofs are inkjet (Epson). If you have a digital press, you have the option of just printing one (1). Proof = Press (You better be able to match that :-))

Color or Quality bar contains patches or blocks of solid inks to be measured with a spectrophotometer (handheld or scanner), like an X-Rite or Techkon. Lab values get converted into Delta E (dE) color difference for calibration (fingerprint or ICC profiling). Corresponding SID (density) & TVI...

Comparing apples to apples? When comparing density measurements, measurement conditions are important. Paper included (absolute) or excluded (relative), wet or dry, backer (white, black, self), filter response, ect. Status T uses a 47 blue filter for yellow ink, wide band (~100nm) Status E uses...

Gregg, I wonder why you didn't post this on your original thread on May 3 for "How to differentiate ISO 1`2647 vs Fogra"? For calibration, you find the lowest Delta (dE) based on Lab, checking hue angle (h'). For process control, you use its corresponding solid ink density (SID). The +/-0.08 is...

With traditional printing (analog) you can print a "spot" color, also known as special, customer, corporate, logo, brand, Pantone, PMS, fountain, etc. The cost is more because it needs its own ink, plate, unit, makeready, washup. The advantage was more choice (metallics, fluorescents), accurate...

Gregg, You have mentioned 3 Fogra profiles for various paper: #39 - Coated (older 2004) #51 - Premium Coated (newer 2013) #52 - #5 Uncoated The paper surface smoothness, gloss, and holdout all effect the solid ink density (SID). For example (approximate), Black ink on: Gloss = 1.80 Matte =...

The devil is in the details. The now known facts that the "wet" press proof is done on 2 different presses, on 2 different passes, is important! And it looks like the sequence is CM,KY, wet trap within pass, dry trap between pass. Can you confirm production sequence (lay down order) is also...

I thought the days of actual press proofs (Wet) were long gone, especially for commercial/book/magazine printers. Can you share some measurements of Solid Ink Density (SID) and Tone Value Increase (TVI) of both proof and production?

Yes, metallic inks (PMS 877 Silver) are opaque and will mostly hide or cover what's under them. Flexo being dry trap, doesn't have the concerns offset litho has with wet trap, unless it's UV. This is "ink" or "press" trapping, wet vs dry, sequence order. But there is also "fit" or "prepress"...

I use water paints You mean water based inks, not solvent or UV. So substrate is uncoated paper. I print analog plates and films on an Epson digital printer You mean plating is analog film in a vacuum frame. But proofing is inkjet.

I always used the Magenta shades of Rubine (yel) vs Rhodamine (blue) for the blood color example.

The world has options and choices! A good homework assignment for students is to fill out this table.

This is similar to all the discussions on PrintPlanet about offset litho. Do a search here for that and you'll find many discussions.

What if the press color OK had out of specs values for SID (solid ink density), TVI (tone value increase), GB (gray balance)? On the reprint, would you want me to print poorly over again? Always use the prepress customer approved proof for color matching.

When you say the register is off, can you be more specific? It's always yellow (last down) but is it always shorter or longer around the cylinder or across the cylinder? I assume paper is grain long (sheetfed), ~60# coated and flat, not wavy or tight edged.

Yes, for small printers (80% of 35K have <10 employees) offset litho is being replaced with digital (toner). Curriculum included this, per virtual tour video. Larger printers are using digital (inkjet). That was covered in prepress classes, mostly for proofing. Yes, concepts of small...

This device is a capstan (flat) photographic laser imaging device. So the light sensitive emulsion on the polyester base needs wet chemical processing. I think several small printers converted to toner-based poly plates being made on a laser printer. No light sensitivity, no wet chemical...