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OpTest Mottle Analyzer (OMA)

The OpTest Mottle Analyzer (OMA) revolutionizes the measurement of print and coating mottle! Using advanced wavelet algorithms, the OMA quickly quantifies print and coating non-uniformity over a range of mottle sizes from 0.5 mm to 16 mm. Comparisons with reference samples are performed automatically, providing the user with a rapid determination of print and coating mottle intensity and size scale differences.


Product Name: OpTest Mottle Analyzer (OMA)
Product Code: LMA04
Test Material: Paper, Board
Manufacturer: OpTest Equipment Inc.
Availability: Worldwide


  • Comparison with user-selected reference samples: Suitable for both solid print and coating surfaces.
  • Windows™ based: Bitmap storage and retrieval, Excel™-ready data and print-outs.
  • Faster, more precise, and more objective compared to visual testing: High correlation with visual assessment.
  • Certified industrial scanner: Factory calibrated and certified.


A mathematical technique for frequency analysis, called ‘wavelets’, emerged in the 1980s and is now widely used. Researchers in signal processing have developed wavelet methods for various applications, such as filters for de-noising old musical records, compression of image or video data for file transmission and storage.

The OMA consists of standalone software and a high-quality color document scanner. The OMA measures solid print and coating areas up to 100 mm x 100 mm and calculates the mottle intensities for 6 size ranges, or components, ranging from 0.5 to 16 mm.

Component M1 M2 M3 M4 M5 M6
Scale (mm) 0.5 1 2 4 8 16

Published reports have demonstrated excellent agreement between visual panel rankings and the OMA indices. The OMA was found to be faster and more precise compared to visual ranking techniques. Therefore, the OMA can advantageously replace these time-consuming, subjective visual evaluation methods.

Results and Reports:

  • Quick and accurate measurement of mottling: Using wavelet algorithms.
  • Detailed reports and analyses: In Microsoft Excel™ format, including templates and auto-load macros.
  • Component-based analysis: For a better understanding of different mottle sizes.

System Requirements:

  • Computer: Two available USB 2.0 ports, CD drive, Microsoft Windows™ 7 Pro or higher, Microsoft Office™ (2007 or higher).


  • Certified computer: With Excel™, Active X, and turn-key ready.

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