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2 CHARISM A I 7 34) Column A allows the possibility to adjust the exposure (luminance values) of the UVL image using the slider provided (Figure 3-76), so that these are accommodated comfortably within the SRGB colour space gamut. However this should only be reguired if any of the XYZ values of the images in Al are greater than 100. 35) Double-click on the “targets” or “object” thumbnails in Al to view the images. The toolbar at the top gives live XYZ values at any point where the cursor is rested. If values greater than 100 are observed, adjust the slider shown. 36) The sRGB (or RGB16) UVL images corrected for ambient stray radiation (and exposure compensated, if required) can be viewed and saved in the “results” tab. Images of the mathematically reconstructed ambient stray radiation are also available in this column of the “results” tab (See later). Correcting for the “pigment-binder’” interaction (Kubelka-Munk) 37) Click on the “uvikm” tab to the right (Figure 3-77). Column J uses the corrected VIS, UVR and UVL images (automatically carried over from the “viscalib”, “specden” and “uvistray” tabs, respectively) to calculate y, a function which expresses the extent to which the pigment particles absorb the light emitted by the luminescent materials (for more details see Chapter 1). 38) The resultant UVL images divided by the calculated y function can be observed in Al (Figure 3-77). Note that the images in the “targets” and “object” thumbnails can be the same image (as above) or a different image. To view the images, double-click on the “targets” or “object” thumbnails (Figure 3-77). Eile Edit View Toolkits Help input linear markup viscalb uvicalib align specden , falsecolour wvistray [dr] vera vikm results + +) neat Se TT S| a label | visible reflectance S)a1| | label | KM of Uv-induced visible luminescence, stray light removed A v targets label | visible reflectance with calibration targets, colour-calibrated targets A iS targets 2! object v object label | visible reflectance of object, colour-calibrated object v input.Pair (KM of " ++ J2.label) 317.targets J17.object ( viscalib,H10 a S| 2 label | UV-induced visible luminescence, stray light removed A >) targets A S| object uvistray.Q47 5] A specden.A16 aiset| 6 2B 0) [Ju ef Bun) ow lf - ele.| whe] Pu wa) Wa) wel Bef Wal [deren [0.980 GS zis Figure 3-77 Version No. 1.0 Date : 14/10/2013 164
