MATLAB: How is Delta_E is computed in “colorTable” returned by the “measureColor” function

colortabledelta_eImage Processing Toolboxmeasurecolor

How is Delta_E is computed in "colorTable" returned by the "measureColor" function?

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Delta_E is computed as Euclidean color distance between the measured and reference color values in L*a*b* color scale. This is outlined in CIE 1976.

Please refer to the following link for the documentation:

https://www.mathworks.com/help/images/ref/esfrchart.measurecolor.html#d119e155817

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MATLAB: How to use ICM files in MATLAB to display images with most accurate color

The following example from in the documentation walks through an example to convert color data from the RGB color space used by a monitor to the CMYK color space used by a printer using ICC profiles:

https://www.mathworks.com/help/images/profile-based-color-space-conversions.html#f8-24493

Further, the attached M-file demonstrates a similar example to use the ICC profile of a scanner and display monitor to accurately represent color data.

The general workflow to transform color data using ICC profiles is as follows:

1) Read ICM files in MATLAB using the "iccread" function. Please refer to the documentation link below which lists examples:

https://www.mathworks.com/help/images/ref/iccread.html

2) Call the "makecform" function to create a color transformation structure using the data from the ICM file.

The documentation link for the "makecform" function is below:

https://www.mathworks.com/help/images/ref/makecform.html

You may additionally have to modify the parameters in the "makectransform" function to suit your requirement.

3) Once the color transformation structure is created, you may pass it to "applycform" function to apply it to an input image.

The documentation link for the "applycform" function is below:

https://www.mathworks.com/help/images/ref/applycform.html

MATLAB: If I use the property “ColorOrder” while plotting, the color order does not change. How to use the “ColorOrder” property

The property "ColorOrder" is not getting updated because high level functions such as "plot" reset "ColorOrder" every time plot function is called.

In order to suppress this behavior, there is a "nextplot" property which can be used. This by default is set to "replace" which would reset the "ColorOrder" of the next plot to default. However setting it to "replacechildren" would save the "ColorOrder" property that you have specified explicitly.

Below is the change required to make changes to "ColorOrder" property:

>> set(gca,'ColorOrder',cOrder,'nextplot','replacechildren')

Review the documentation for these properties as well from the below link:

https://www.mathworks.com/help/matlab/creating_plots/preparing-figures-and-axes-for-graphics.html

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MATLAB: How to use ICM files in MATLAB to display images with most accurate color

MATLAB: If I use the property “ColorOrder” while plotting, the color order does not change. How to use the “ColorOrder” property

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