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About Me
- Gordon Pritchard (a.k.a. gordo)
- Formerly Print Quality Marketing Manager for eleven years at Creo/Kodak. Presented at print technical conferences, trained printers and buyers regarding print quality issues in Europe, N. America, and S.E. Asia. Articles published in trade journals, co-authored TAGA paper on halftone screening, authored BRIDG's guide to halftone screening. Previously Technical Director of Western Canada's largest commercial sheetfed shop. For several years Professor of Digital Graphic Design at Emily Carr University. Former Creative Director at McCann Ericksson Vancouver. Currently looking for opportunities related to the subjects covered in this blog. Contact me at: pritchardgordon @ gmail (dot) com.
Past Topics - but not every topic covered is listed here.
- AM/XM Screening (27)
- Color alignment (41)
- Color tolerancing (9)
- competition (35)
- DMaxx (1)
- dot gain (12)
- Dot Shapes (5)
- FM screening (21)
- GCR (10)
- Ghosts (2)
- grey balance (6)
- Grey Levels (1)
- Grrrrrrrrrrr (5)
- Halftone Screening (36)
- Hi-Fi color (5)
- Ink (14)
- ink saving (10)
- Ink Sequence (4)
- Investments (13)
- jpeg (3)
- Loupes (2)
- lpi/dpi (5)
- Metamerism (1)
- Misc. (44)
- Moiré (8)
- Optical Brightners (6)
- Pantone (11)
- Paper (3)
- Print 09 (8)
- print buyer (15)
- printing press (35)
- Profit (6)
- proofing (9)
- quality (99)
- RE:Print (11)
- Registration (3)
- Reseparation for ink saving (9)
- Rosettes (4)
- Scanning (4)
- Screen angles (5)
- SID (8)
- Spot color (11)
- Success (64)
- Supplied art (24)
- TVI (10)
- UCR (2)
- Vendors (10)
- Wayback View (35)
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HI Gordo, could you comment on the eventual similarities between Status E DIN 16536 NB (un-polarized narrow band) and Status T.
ReplyDeleteIf I understand your question correctly...
ReplyDeleteThere are two terms to describe the wavelength width of light that is allowed to pass through the densitometer's filter - Wideband and Narrowband.
Status E (Europe/Asia) densitometers use narrowband filters. This makes them more sensitive to small variations in density.
Status T (N. America) instruments typically use wideband filters. This makes them have a somewhat more human eye-like response compared with narrowband instruments.
The red and green filters of wideband and narrowband instruments are usually the same - so the values for C,M and K will be similar. The difference is with the blue filter. That means that the Yellow reported density will differ between Status E and Status T.
Here are some typical reported densities measured from the same sheet - you can see the difference in the reported Y density:
Status E unpolarized:
C: 1.26, M: 1.23, Y: 1.33, K: 1.49
Status T unpolarized:
C: 1.28, M: 1.17, Y: 1.09, K: 1.47
As you wrote, there are many things that effect the appearance of a printed image on a sheet: ink/water balance, wet trapping, press roller temperature, etc. Ink film thickness is important because it is practically the only thing a press operator can change to counteract the others. I think it was Miles Southworth who did some studies 10-15 years ago on press control and maintaining color consistancy and had some very interesting conclusions. I think it is very important to remember that uniform ink densities do not mean uniform printed color. Densities can (and do) vary as much as +/- 0.1 density units over a long press run while the printed images all are visually indistinguishable.
ReplyDelete