Image Engineering camSPECS User Manual page 27

1. Select a Camera Spectral Sensitivities file (.txt) with values interpolated to 5 nm (see advanced settings)
created by camSPECS.
2. Select the desired transform type from those available.
•
Matrix – Colorimetric creates a 3x3 matrix from camera RGB to XYZ for the specified Reference
illuminant.
•
Matrix – White point preserving creates a 3x3 matrix from camera RGB to XYZ constrained for white
balance to the specified Reference illuminant.
•
ICC Profile creates a transform from camera values (assuming white-balanced image data) to the
International Color Consortium Profile Connection Space (PCS) and is chromatically adapted from
the specified Reference illuminant to ICC PCS illuminant D50. Several Profile Types (4) are
available:
•
Colorimetric - Matrix creates a standard matrix-TRC profile using a 3x3 matrix from camera RGB
to XYZ and gamma=1 in the TRC (tone reproduction curve).
•
Colorimetric - CLUT creates an exposure-invariant 3D color lookup table (multidimensional
lookup table - MLUT) and gamma=1 in the TRC, giving improved accuracy and flexibility.
•
Rendered - CLUT creates an exposure-invariant 3D color lookup table (multidimensional lookup
table - MLUT) and user-specified gamma in the TRC. This option is helpful in applications such
as PhaseOne CaptureOne, which expects gamma = 1.8 for the default rendering and linear
mode.
•
ACES (Academy Color Encoding System), used in the motion picture industry, create a CTL
(Color Transformation Language) file that encodes a colorimetric transform that can be used with
Image Engineering
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