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Offset Press Audit Test Form

Full Size Offset Press Audit Test Form

Test Form Layout

 

 

 

 

12  instances of "Minimal G7" control stips (3 rows x 4 colulmns)

ChromaChecker supports barcodes that define the position location on the press form. ChromaChecker Capture and Alwan Print Verifier supports barcode descriptions. 

 

Single control strip with barcode:

Sheet locations/descriptions:

Naming convention is easy.

12 measurements taken from the single sheet makes it easy to calculate within-sheet variations; one of the most strict parameters for press quality judgement. 12 instances makes 66 pairs of each single patch (total of 1386 pairs on a single sheet).

 

 

An alternative to Minimal G7 — CC-84 test forms:

1. 4 x CC-84/1R - 12 sets of Primaries with limited on sheet location recognition

2. 4 x CC-84/3R - 24 sets of Primaries with limited on sheet location recognition

 

 

Idealliance P2P51 (x2) and TC1617 Testing Forms

 

 

Addressability

Sheet provides collection of various visual tests that helps to user to understand press limitations

 

 

 

Registration Marks

 

 The use of lines with designated thicknesses (0.02,  0.04 and 0.08 mm) makes that we can visually accurately estimate the amount of misregistration.

 

 

 

Gray Balance

Split Images created part with CMY, and rest with Black only will visually shows if calibration curves are correct.

 

Grey Balance Test Picture:

  • Staircase split version — this picture is CMY addressed — if a device is G7 calibrated even without color management picture should be neutral. 

       
                        CMYK                                                      K                                                         CMY                                   

Moon - it is manipulated picture to check Total Ink Limit (Total Area coverage) - description on the picture shows current TAC value. Repeatedly repeating the image in different parts of the sheet allows visual evaluation of the variations.

Grey Balance Wedge

 ,   K only:   

An additional addition is a gray wedge with an ideal combination of gray with black and CMY colors. The values used do not come from G7 - where one of the scales is a bit darker than the other - we expect a full congregation of wedges. 

Note: test images and gray balance wedges are dedicated to selected ICC profiles (eg GRACoL_2013) and will only work for the printing conditions described by the selected profile!

 

 

 

Other Pictures on Test Form

  • Spectrum — a synthetic picture that visually  shows colorspace continuity (read here more)
  • Baby — G7 calibrated device should keep skin looking natural
  • Track — A sky and well-recognized red (very popular soft drink) is a sample of memory colors
  • Still-life — a lot of near to be neutral, grey objects made of various well-recognized materials: porcelain, paper, metal tin, an aluminum film, glass, various metals — most of the objects are well-known, so it is easy to judge if reproduction match expectations.

 

 

 

Curves and Registration control strip

We have developed control strip that is very sensitive to both correct TVI curves and correct registration.

Here are examples of how it images in real production:

 

 a. Perfect Registration, Perfect Curves

  

 

 b. Perfect Registration, Wrong Curves

 

 

 c. Wrong Registration, Perfect Curves (embossing effect) 

 

   close up      ...         ...

 

 d. Wrong Registration, Wrong Curves

 

 

Target locations on press sheet:

 

 

 

Slurring/Doubling Control Strip

S/D Control Strip is dedicated to measure differences for vertical and horizontal patterns .
There are solids and sunstrate for densiy calculation.

microstripe = 0,4 mm (40 px when exposured on 2540 dpi) — equivalent of 31,75 lpi line shape screening 

Target locations on press sheet:

Additionally a visual S/D test is printed many location on the press sheet:

 

 

 

H-100 iSis Harmonization  Instrument Inspector Target

This Target can be read by most Instrument on the market. It enables Instrment Harmonization.