ANNOUNCING
VERSION 2.2 OF THE
SMITH-KETTLEWELL AUTOMATIC MACINTOSH CALIBRATOR
The Smith-Kettlewell 'LightMouse' automated calibrator provides a luminance
calibration of all 3 X 256 levels of the DAC outputs of a Macintosh
computer (Macintosh II family and later, including PowerMacs). Calibration
takes a total of 15 minutes and includes compensation for drift during the
calibration procedure. Accuracy is within about 5% of each DAC level (less
than 0.1% of the luminance range). No interpolation across levels is
required because all levels are individually calibrated.
Output is provided in the form of an ASCII table usable by all common
applications, such as graphics plotting software. The Calibrator output is
compatible with the Morphonome Image Psychophysics software package for
Macintosh computers but provides a standalone look-up table for other uses
The 2.2 version includes the following features:
1. Noise-reduction design with an outboarded preamplifier;
2. Deactivation of the Apple gamma correction look-up table;
3. A revamped control panel;
4. Error-checking among multiple data samples.
The LightMouse 2.2 calibrator is available from Smith-Kettlewell at the
construction cost of US$1200.00 (including shipping) for the photopic
sensor, power supply, components and assembly. For further details, please
contact Dr. Christopher Tyler at cwt@skivs.ski.org or download the trial
version from the web page at www.ski.org/CWTyler_lab/morph.