Maxwell Metrics

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"Metrics" are the different forms of measurement analysis which Maxwell calculates for your tracks. Examples of some Maxwell metrics are:


Maxwell will automatically calculate and retain the results for these seven metrics with each measurement it collects - even if they are not specified in your Metric Details pane.


Average Delta E is a common metric to use as it gives an idea of how far from the aim are the colors.

The Maximum Delta E will indicate how far out is the color furthest from its aim.

Media delta E tracks the white point only, so you can see if your media is changing (and can also be an indication of your measurement repeatability.)

Standard Deviation is a measure of how widely distributed the measurements are from the average. It is worthwhile checking standard deviation on measurement data, since average delta E by itself will not show you how widely varied those measurements are.

Worst 10% / Best 90% reports on the average of the worst 10% of patches or the average of the best 90%.

Average Delta H returns the average of the delta Hue - how far apart is the hue component only.

Average Delta C returns the average of the delta Chroma - the color saturation component.



Contents

How to Create Metrics for a Track

Where to find metrics in Maxwell

Metrics are part of a Reference Set which is found in the expanded Track Details pane.

A reference set will contain the measurement file you are using as a Color Aim (sometimes known as a reference file), and the Metrics that are associated with this reference set.

Click the Reference Set Arrow

Click on the arrow to the right of the Reference Set name to bring up the Reference Set Details pane.

Click the Metrics Link

Examples of metrics pane details

Click the Metrics link to bring up the Metrics pane. The Metrics link is the first link under 'Related Items'.

Click the [+] to create a new metric.

Metrics pane

Many users find it helpful to create at least an "average deltaE" metric and a "maximum deltaE" metric.

NOTE: At least one metric is required in order to view a trend report.

(The CIELAB2000 Color Difference Equation is a ellipsoidal color difference scale similar to CMC.)

In rare case, like tracking printer dot gain, a value of 20 might be desired.

Tolerances

Individual device values for tracking individual colors


Patch selection

It is possible to create a metric that tracks specific device values. For example, if you wish to track the results of measuring the 50, 40, 40, 40 CMYK patch in a target, specify that here.

"-1" is the default. This disables the use of individual patch values.

Choice of patch selector set

Patch Selector ColorSet

It is also possible to choose a subset of colors of a larger target for use as a metric. For example you could choose to track how well a printer is able to consistently print flesh tones.

  • PatchCode - identifies the list of colors by the numerical PatchCode.
  • Names - identifies the list of colors by the name of the uploaded measurement set.

The default is "(all patches)."

Trend line Colors

Maxwell will automatically assign contrasting colors to the actual trend line depending on how many metrics you have listed.

If desired, a specific color can be assigned to this metric in the trend line by using this field.

Troubleshooting

When I run a Trend Report, why does Maxwell say "No Data Available" when I have several measurements uploaded?

"No data available"
Answer

If you have not created any metrics for a track, then you have not told Maxwell what you want to know, what you want Maxwell to "report."

Run through the procedure above for "Creating Metrics for a Track."

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