Image Engineering
Seite
9
von
12
4.4
Validation module
1.
Select a spectral response file (.txt) with values interpolated to 5 nm (see advanced settings), that
was created by camSPECS.
2.
Select a spectral distribution for the light source used for the illumination of the ColorChecker test
chart. Individual light sources may be used here. To create an individual light source file, intensity
values for wavelengths between 380 and 780 nm in 5 nm steps are needed. Put this data into a
text file with the wavelength values in the first column and the intensity values in the second
column. Columns must be separated with a tabulator. The files in the /calibration_files/lightsource
directory of the camSPECS program folder may be used as a template. Format your file
corresponding to these files and copy it to this folder then restart camSPECS.
3.
Select ColorChecker reflectance data. The data used contains the spectral distribution between
380 nm and 730 nm in 5
-
nm increments.
4.
Select a RGB image file of a ColorChecker test chart (ColorChecker with 24 patches or Color
Checker SG with 140 patches). The image must be a raw image file. Do not use compressed
image formats like JPEG or other output
-
referred encodings since source colors have been
rendered.
