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Analyze Tool

Analyze Tool

The tool "Analyze" compares measured values against a reference and judges the differences using tolerances from an Analyze setting.

It creates an on-screen report to show if a print is in or out of tolerance.

Analyze Setting

An analyze setting consists of two parts:

  1. Standard which determines the criteria and tolerances to be used
  2. Reference Printing Condition to compare against

Status report

The status report shows:

  1. The overall result using four symbols
  2. Details of criteria and results as a table
  3. Result for every criteria using four symbols
Proof certification result
Value is in tolerance

Value is in tolerance

Value is just in tolerance

Value is just in tolerance

Value is slightly out of tolerance

Value is slightly out of tolerance

Value is out of tolerance

Value is out of tolerance

Easy Compare

Easy Compare is a special Analyze Setting. It enables the simple comparison of measurements with

  • Measurements from MYIROtools
  • External ISO 28178 ("CGATS") files
  • ICC Profiles

The result of Easy Compare is a statistical analysis of the differences.

 

USE EASY COMPARE

  1. Select a measurement from the Data List
  2. Select "0 - Easy Compare" as Analyze Setting in the Analyze Tab of the View Module
  3. Select a Preset 
  4. Choose a reference file from the list
  5. Choose between "Absolute White Point" or "Relative White Point"

PRESETS AND RESULTS

The presets judge the differences using six steps.

They are encoded in different colors from dark green (small difference) to dark red (big difference).

For every single patch the evaluation result is shown using this color scheme in the "Chart View" and the "List View" tab.

 

The available step sizes are 

∆E = 0.5

∆E = 1.0

∆E = 2.0

Add an internal file as reference

To add a measurement from MYIROtools to the list of available references
make a right-click onto the measurement in the Data List and select "Export as reference file"

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Working with external resources

To add an external resource such as an ICC Profile click the "+" button next to the list of reference files and select your file.

It will be copied to a special folder inside the MYIROtools working folder and appears at the bottom of the list.

User Reference files can be removed from the list. They will be deleted from the MYIROtools working folder. 

Select your file and click the "-" button next to the list.

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Tutorial Easy Compare
Easy Uniformity

The Analyze setting "Easy Uniformity" enables a quick evaluation of the uniformity of a print.

First you need to take several spot measurements of the area of interest.

MYIROtools ships with templates for 3x3, 3x5 or 5x5 measurements.

Please note that these templates only work with handheld instruments in spot mode.

After you have measured all patches you can activate the analyze module by clicking onto the icon in the top left corner 

 

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Select the analyze setting "2- Easy Uniformity".

You can then choose between three different tolerance levels for the maximum deviation of every single measurement to the measurement in the center of the measurement area:

  • ∆E = 0.5
  • ∆E = 1.0
  • ∆E = 2.0

The report shows the average and the maximum color difference.

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Tutorial Easy Compare
Easy Spotcolor

The Analyze setting "Easy Spot" enables a quick evaluation of spot color reproductions to a reference.

 

The first measurement needs to be a measurement of the reference.

All subsequent measurements will be done on a reproduction.

In case you have less samples than defined in the measurement template please measure a sample several times at different positions.

MYIROtools ships with templates for 2x2, 5x5 or 10x10 measurements.

Please note that these templates only work with handheld instruments in spot mode.

After you have measured all patches you can activate the analyze module by clicking onto the icon in the top left corner 

 

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Select the analyze setting "2- Easy Spotcolor".

You can then choose between three different tolerance levels for the maximum deviation of every single measurement to the first measurement (the one of the reference):

  • ∆E = 0.5
  • ∆E = 1.0
  • ∆E = 2.0

The report shows the average and the maximum color difference.

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Analyze Settings

 

 

MYIROtools Basic offers the most important quality control settings.

  • A: Validation Print
    • Criteria and tolerances taken from ISO 12647-8
  • B: Contract Proof
    • Criteria and tolerances taken from ISO 12647-7
  • C: Solid Densities
    • This setting informs about the densities of the solid primaries
  • D: G7 Verify
    • Criteria and tolerances for G7 validation
  • E: PSD PrintCheck
    • Criteria and tolerances for PSD validation
  • F: QC Photo
    • Criteria and tolerances for Photobook production

These settings are combined with the most important reference printing conditions

  • FOGRA39
  • FOGRA51
  • Japan Color 2011
  • JMPA2018
  • ISO/PAS 15339 CRPC6
  • MYIROtools Advanced offers the possibility to customize the Analyze settings.
Analyze Advanced
MYIROtools Analyze parameters

With a license for MYIROtools Advanced it is possible to customize the settings of the Quality Control module Analyze.

The following parameters can be adjusted:

  • Reference type
  • Reference file
  • Measurement condition
  • Tolerances

In order to change a parameter it is necessary to show them by clicking onto the rectangle in the top left corner.

The available reference types are:

 

  • Reference File, Absolute Whitepoint
    • The reference values that are used are taken from a reference file which can be selected below ("File").
      The whitepoint that is used for the calculations is taken from the reference file.
      This is the reference type that is typically used for quality control.
  • Reference File, Relative Whitepoint
    • The reference values that are used are taken from a reference file which can be selected below ("File").
      The measurement values are scaled based on the whitepoint from this reference file.
      As a result the color difference of paper white equals 0.
      This is the reference type that is used for SCCA and Fogra PSD mediarelative.
  • Reference File, Custom Whitepoint
    • The reference values that are used are taken from a reference file which can be selected below ("File").
      These reference values and the measurement values are scaled based on a whitepoint that is set by the user.
      As a result the color difference of paper white equals 0.
  • Single Patch, Measurement ID
    • Used for Spot-Color and Uniformity evaluation.
      The reference value is a single patch. It is identified by the ID in the chart definition.
  • Single Patch, Measurement Sequence
    • Used for Spot-Color and Uniformity evaluation.
      The reference value is a single patch. It is identified by its position in the measurement sequence.
      Sequence = 1 means that the first measured patch is used as a reference.
  • Single Patch, Measurement Filter
    • Used for Spot-Color and Uniformity evaluation.
      The reference value is selected based on the filter set selected in List View.

MYIROtools has several preinstalled standard printing conditions as reference files. These can be selected from a list (see screenshot) and used for quality control.

To add a custom reference file click on the "+" and select a file from your harddisk. It will appear under "User Reference File" in the list.

The measurement condition that is used for the analysis can be adjusted. The settings affect only the selected measurement file. The measurement condition of the reference is taken from the reference file. Therefore these settings should only be adjusted for good reasons.

 

Options for colorimetric values (e.g. CIELAB)

The first list sets the measurement light source.

The second list sets the reference illuminant and observer.

 

Options for densitometric values

The list of status options defines the filter set that is used to calculate the densities.

The last list defines if the densities are calculated absolute ("Paper" has a density > 0) or relative ("Paper" density = 0).

In MYIROtools Advanced it is possible to change the standard tolerances for the evaluation.
This is achieved by setting a scaling factor for the tolerances as a percentage.
A scaling factor of 80% changes a tolerance of dE = 10 to dE = 8.
A tolerance of dE = 5 is changed to dE = 4 etc.

A scaling factor can also be set to a value > 100% to create a less strict judgment.

Using the "+" button you can save your customized Analyze Setting. It will appear in the list and can be used for other quality control jobs in the future.

The "Save settings" dialogue allows you to specify the filename, the name of the setting for the user interface and to add comments. To translate the name and comments into other languages activate the checkbox "Multilingual".

After having selected such a customized Analyze Setting you can delete it using the "-" button.

The checkbox "Automatic calculation" is switched off when you open "Analyze".

To get the evaluation result you have to click "Calculate" or switch on "Automatic calculation".

It is advisable to leave it "off" when you analyze charts with many patches. Otherwise MYIROtools would calculate the result every time you adjust a parameter. For typical control wedges with 50-100 patches the calculation is fast and it is save to leave "Automatic calculation" switched on.

When you change to the tab "2D (Lab)" you can check the drift of the deviations in the drift indicator.

The mesurements are plotted into four diagrams:

Drift (∆ab*) shows the deviations between print and reference in the a*b*-plane. 
The reference is the center.
It answers the question if your print has a colorcast compared to the reference.

Drift ∆L* shows the lightness deviations.
It answers the questions if your print is lighter or darker than the reference.

Drift ∆C* shows the chroma deviations.
It answers the question if your print is less or more vivid than the reference.

∆E shows the overall color difference in a plot.

 

Create a custom reference