After importing an image into the Evince Workspace, the original image wavelengths, i.e. spectral bands, will be shown when expanding the Original data.

The DataSet, however, will be unfolded, which means that each pixel is inserted into the DataSet as an observation. Hence, the number of observations will be the number of horizontal pixels multiplied by the number of vertical pixels. The number of variables will correspond to the number of wavelengths or spectral bands.

The number of observations and the number of variables can be seen in the Quick Information of the DataSet. The original image, with 320 variables, 256 observations and 118 layers as seen in the import, has unfolded to 81920 (320*256) observations and 118 variables. It is now possible to calculate PCA and PLS models on the unfolded DataSet!