MatVis format: MatVis('function name', additional parameters...)

Function: 'trialLUT'

Declare the number of lookup tables to be associated with a particular trial.

Parameters :

('trialLUT',trial, nTables)
trial = condition or trial number (1-10)
nTables = number of LUTs

Return:

1 = indicates an internal error occurred in MatVis
0 = successful completion of command

Description:

In 8 bit video modes a different lookup table (LUTs) can be loaded with every video frame presentation (depending on the video card). The selected LUT for each video frame is independent of the video image presentation ordering. The trial command must be completed before any of the LUT related commands are used. By default the system uses the same LUT for every video frame presentation. The default LUT is a ramp where each successive color video gun table contains the numbers 0-255. Therefore, the source image will appear as a gray scale image with 0's in the image appearing black and 255's in the image at maximum contrast. The command LUT8 is useful for applying a gamma correction LUT as the default LUT.

Examples:

Declare that trial (condition) five will make use of 5 different LUTs.

MatVis('trialLUT', 5, 8);

See Also:

temporalLUT trialLUT LUT8