query_grey ( : : : Greyval )

Query of the displayable greyvalues.

query_grey returns all greyvalues that are used for greyvalue output (disp_image) and that can be reproduced exactly in the active window. They can be set with the set_grey call. The number of displayable greyvalues can be set with set_system(::'num_grey_*',...:) before opening the first window.


Parameters

Greyval (output_control)
integer-array -> integer
tuple of all displayable greyvalues.


Result

query_grey returns TRUE, if a window is active. Otherwise an exception is raised.


Possible Successors

set_grey, disp_region


See also

set_grey, disp_image



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