Slow and Fast Mode Measurements

Calibrator Tool provides two modes of measurement: slow and fast. In fast mode, the Calibrator Tool main program requests the loadable module to return the minimum number of measurements to increase the speed of acquiring the measurement data. In slow mode, it requests that the loadable module return measurements for all the visuals whose color it has writable control over. These distinct modes provide support for frame buffers that might have different color responses at different depths.

In slow mode, visuals are considered to be equivalent if they have the same gamma and depth. In this case, measurements are required for one representative of a class of equivalent visuals. If, for example, 24-bit DirectColor and 24-bit TrueColor have the same visual gamma, they are considered to be equivalent, and measurement is performed for TrueColor only. Since measurement is a response of the monitor to a particular depth and gamma, the measurement is not repeated for DirectColor. Instead, the DirectColor visual profile is updated with the TrueColor measurement results.

In fast mode, visuals are considered to be equivalent if they have the same gamma, regardless of depth. This mode is provided for monitors whose response is believed to be the same for varying numbers of planes. If, for example, 8-bit PseudoColor and 24-bit TrueColor have the same gamma, the PseudoColor measurement is the only one performed, with the result being used to update the TrueColor as well as the PseudoColor profiles. In this case, it doesn't matter which visual generates the color patches as long as the visuals represent the same color.