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Monitor PreTest

Interest of FograCert Softproof Monitor

As part of FograCert Softproofing System a monitor (representing a sample from a given model series) will be tested in with respect to:

  • Viewing Cone Characteristics
  • Uniformity
  • Warm-up behavior (informative)

Only a monitor that fulfills all normative criteria can be used in a  Softproofing System to be certified.

The criteria have been developed as part of the research project „Set up and evaluation of a softproof workstationg“ (Fogra-Nr. 10,047) that was greatly supported by the associated committee. This committee consisted of representatives of the industry -- vendors of softproofing systems, monitors and viewing cabinets -- as well as experienced softproofing users.

Viewing cone characteristics

Based on an extensive set of spectral measurements the viewing cone characteristics are evaluated by means of hue, chroma, lightness and gradation (“stable gamma”) properties. Monitors fulfilling the criteria for colour (ΔE00 < 10) will be classified as class B monitors. When a monitor fulfils the additional criteria [(ΔY(TRC) < 10 %)] to show a stable gradation over the viewing cone, the monitor will be classified as class A. Both conformance levels (“class A” and “Class B”) are permitted to be used in a softproofing system to be certified.

Uniformity (homogeneity)

25 (5 by 5) evenly spaced patches over the entire screen area are used to evaluate the uniformity. It is checked for different driving levels namely white, grey and dark grey where both the area uniformity (per driving level)  - [ΔE00 < 4] as well as the stability of the gradation (computed by using different driving levels)  - [ΔY(TRC) < 10 %] are used. If a monitor exhibits a visual non-uniformity in one of the 25 patches to be measured this patch is divided into 9 subsections (3 by 3) that  will be also measured. From those 9 measurements the measurement with the largest colour difference to the centre measurement will be used for the further analysis. This approach assures that small, but visible disturbing inhomogenities are certainly assessed.

Pixel defects are judged only visually and not by means of an objective test method such as those defined in ISO 9241-307. In the context of high quality softproofing Class 0 panels, which are completely defect-free, including no full pixel or sub-pixel defect, are recommended.

Test conditions

The assessment of the viewing cone is done with a Display Metrology MS-8 spectroradiometer. For the uniformity measurements an X-Rite EyeOne Pro (Rev. D) is used.

The colour differences between perpendicular viewing direction and inclined viewing angles are calculated for a viewing distance of 50 cm. It is important to note that the actual viewing distance of the end user can be different from that -- usually in the range of 45 cm to 80 cm. The tolerances were determined for a default viewing distance of 50 cm, which can be seen as typical minimum viewing distances. If a monitor does not fulfil the criteria for the default viewing distance the evaluation is done for larger distances and reported accordingly in the table.

Monitors not fulfilling the criteria at the default defined viewing distance of 50 cm (but passing the criteria for a higher viewing distance) can only be used in a softproofing system to be certified, when the intended viewing distance is equal or larger than the certified value.

An overview of the measurands and evaluation for FograCert Softproof Monitor is given in this PDF (Size: 307 kB; Downloads: 5297) (Size: 307 kB; Downloads: 5297).

Does one tested sample represents the entire series?

Yes and No. It is important to note that performing certification on one display does not necessarily guarantee the same result on a different model of the same monitor series. The batch to batch variation is not tested here. We have experienced that the warm-up behaviour and viewing cone measured for a sample display are representative within a given model series.
Contrary the uniformity of a single monitor might not necessarily be representative for all monitors of the series.. In addition the uniformity might change over the time due to aging of the components. Therefore end users are advised to perform a uniformity test for the actual monitor. A useful tool to visually check for potential uniformity problems or to detect faults in the calibration itself are the Fogra monitor test pictures.


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Presentation on the derelectronic displays Conference 2016 in Nuernberg, "Finding meaningful numbers to describe viewing cone characteristics", [PDF (Size: 1.33 MB; Downloads: 3746) ]