September 16, 2013
camSPECS software version 3.0 incorporates a complete new module for evaluating Color Correction Matrices (CCM). The user may now apply a matrix to an image and compare the influence to the original image. Furthermore matrices can be individually adjusted and exported. The matrix calculation module now also calculates RGB to sRGB matrices. Three algorithms are included: least squares, white-point preserving least squares and CIECAM02.
USE OF IN-SITU SPECTRAL REFLECTANCE DATA
For the calculation of a Color Correction Matrix spectral reflectance values are needed as training data. Usually the patches of a ColorChecker or ColorChecker SG are used as objects for this purpose.
Although one may assume that the available color patches represent the real world colors, it is obvious that such reflective targets are not capable of doing that. Even though the colors of a ColorChecker appear to span a wide color space a few of the randomly selected colors from the real world measurements are far outside the gamut of the ColorChecker.
Due to changes of the spectral emission of the lamp over time or after replacement of a damaged lamp, a calibration using the calibrated micro spectrometer should be performed periodically. The calibration of all filters requires only a few minutes and achieves a higher precision compared to the camera used with the old camSPECS version.
The EX1 can also be used as an external measure device in combination with Image Engineering's LE7 with TWO iQ-LEDs.
OTHER NEW FEATURES OF camSPECS:
• Calculating the channel multipliers depending on selected light sources
• Calculates the Digital Still Camera Sensitivity Metamerism Index (DSC/SMI) described in ISO 17321-1, a measurement value for evaluating of how well a camera system can reproduce the color of reflective objects. This index ranges from 0 to 100, where 100 is the best value.
• Export all measurement results as XML files.
• For fast documentation purposes the graphical results displayed in the program can be exported as images.
Customers who already have a camSPECS express can upgrade the calibration tool from the bundled camera to the calibrated micro spectrometer EX1. If the upgrade is ordered before the end of 2013 it will be 1999,- € net, plus shipping. After that period it will be 2.800,- € plus shipping.
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