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M-Score Tracks

M-Score is a calculation created to help quantify the with-in sheet spatial uniformity of an output devices ability to image the same build of CMYK values in multiple locations across the imaging area of the output device. It is based on ISO 15311. It is also a required value in order to qualify as a Certified Digital Printing device via IDEAlliance’s digital press certification program. The M-Score procedure is used as a pass/fail criterion for this test. 

The M-Score computers a single clue, scaled from 0 (poor reproduction) to 100 (perfect reproduction), which correlates well with the perception of print variations for a uniform tinted test form printed on digital press systems. The following procedure is used to calculate the M-Score:

Print the supplied 12x18 test form

Measure the L*a*b* values of all columns (n) and rows (m) with an XY scanning measurement device (I.e. X-Rite iSis XL) using 6mm patch sizes

Average the L*a*b*measurements along the columns and rows. For the 12x18” formate the n=46 and m=64 rows there will be 46 color differences and 64 color differences respectively.

Computer the L*a*b* color differences, delta E00 for the columns by comparing each column average with its neighbor average. Compute the delta E00 for the rows by comparing each row average with its neighbor average. Sum all measurements and multiply by 10.

 

In order to pass this test, the lowest M-Score of all three sheets much be >=60.