These represent a physical target (a print or transparency/slide) that have been measured using a spectro and DO have L*a*b* (or XYZ) measurement values associated with each patch.but there's no DEVICE values like in the case of an RGB or CMYK testchart.we scan or photograph the target to see what device values the camera or scanner produces in response to the L*a*b* measurements of the chart itself. IT8.7/2 reflective and transmissive "charts" are different. So, again, testcharts themselves do not have any measuerment data associated with them at all.if they did, they cross over to being referred to as *characterization data*. For example, GRACoL2006_Coated1 represents a dataset that uses the IT8.7/4 CMYK format.for each CMYK value, there's an associated L*a*b* value.but the IT8.7/4 does not have any L*a*b* data associated with it until it's populated with actual measurement data taken from a press, an inkjet printer or some other CMYK device. The charts simply have reference CMYK values.there's no L*a*b* aim values unless you're speaking of a specific "dataset" or "characterization data". CMYK testcharts such as the ECI2002, IT8.7/4, etc.
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