ps_setgray

(PECL ps >= 1.1.0)

ps_setgray — Sets gray value

bool ps_setgray ( resource $psdoc , float $gray )

Sets the gray value for all following drawing operations.

psdoc: Resource identifier of the postscript file as returned by ps_new().
gray: The value must be between 0 (white) and 1 (black).

成功时返回 TRUE，或者在失败时返回 FALSE.