Geonostalgia this means that the µm2 area is the only thing that really relies on/corresponds to the pixel "grid" on the images directly
It depends on how the image is constructed and what type of ROI it is, but the resolution of the pixel grid also doesn't factor into the area calculation. Importantly, if you're not using the CellSpace approach, the values entered into the 'Shape and Orientation' part of the Imaging Setup will determine the pixel size, which is used in the area calculations.
If it's a CellSpace image, and you have a polygonal ROI (i.e. drawn using the mouse), the area of the polygon(s) can be calculated directly and this is the area value you see in the ROI table.
If it is a disjoint ROI (such as one created from criteria), the pixel size is used (calculated using either the laser log details or the data entered in the 'Size and Orientation' fields). The number of pixels that comprise the disjoint ROI is multiplied by the pixel size to calculate the area.
I hope that helps. Please let us know if you have any other questions.
Kind regards,
Bence