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Why use a reflective proof? Use a transmissive proof so it's more similar to final product from press.

The objective is to closely match the "contract" proof (target, aim), within practical reason (tolerance limits, 95th % CRF cumulative relative frequency curve). Ever read the fine print in gray ink on the back of the quote, it's called the printing trade customs and the printer decides what it...

The buyer should always have a "contract color" proof. If giving a press OK approval at press side, the customer is always allowed to take a same as OK signed sheet with them.

I'm sorry, but I can't, cause they didn't even allow me to take the test-print home. It was just a single sheet. Is this normal - I don't know...

When visually evaluating two images (proof vs press), distance and proximity is important! The closer together the "this vs. that" are (butt, juxtaposed), the more sensitive we are to seeing differences. That why press operators fold, tear, cut press samples and lay them next to the reference...

"K" proofer and gravure e-Quate plate from RK Print. Ductor blade pressure and speed adjustable. Very repeatable, dE<0.5 Takes a few minutes to clean.

Can you post a photo comparing the contract proof vs. press sheeted?

53 - 61 = -8. At the 40% adjust your curve to be -8%.

YES. The types of changes you noted are NOT from normal variations in the first printing. They must be from a completely different printing with different plates. In the 1940's the predominate printing method was letterpress, using relief metal plates.

X-Rite i1Pro is a spectrophotometer (hardware). Software can convert % reflectance (spectral data) into any density (SID, TVI) or color metric (CIE Lab, LCh, dE). ISO Standards use color metrics for calibration. Density metrics can still be used for process control.

Yes, but you need digital plates and/or special screening (XM Hybrid).

Often occurs with converntional AM screening. If you use a hybrid (XM), where dot is FM in highlights, then goes back to AM later (>10%), this would help. The visual appearance is a smooth vignette or blend to zero. Lightness is not from smaller AM dot, but from farther spaced dots.

Yes, temperature does affect dimension (size) of metal. However, the thermal expansion for aluminum is only 24 um/m/1'C. 0.001" (1 mil) = 0.0254um So while the width (40") and length might change ever so slightly, the caliper thickness would be unmeasurable to 5 decimal places. No mechanical...

ISO Standards are often the least common denominator, to meet the needs of the many/most. ISO often uses language of "shall" and "should". Should is tighter than shall. What specific ISO standard are they referring to? I can't think of anything (exposure. processing, handling) that would change...

Also, don't forget Kodak Approval.

Have plate mfg investigate grain direction (roll milling) of the plate?

With traditional AM dot (Amplitude Modulate, round cluster), #GL = (spi CtP / LPI screening)^2. ie: 4800 spi / 133 lpi (flexo) = 36^2 = 1,296 gray levels Formula does not apply for FM stochastic.

You could scan the sample and get the CMYK from Photoshop. To increase accuracy, also scan a gray scale and white point balance on it in case your scanner is not calibrated.