Stranica 172 [172]
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
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