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to elaborate, mike?>
We'll, actually you need Colorlab in addition to MeasureTool
and PS in order to create a text file of the Lab data, but you could simply create an RGB test chart in MeasureTool,
open the tif in Photoshop and convert to Lab, then to get rid of the values outside the gamut of your CMYK profile,
covert from Lab to said profile using rel col, then convert back to
Lab. This should give you relatively evenly distributed Lab values, and all
within the device's gamut. Save the tif and open it up in
Colorlab to export as a text file.