关于matlab，imtool这个函数的问题

IMTOOL Display image in the Image Tool.
IMTOOL opens a new Image Tool in an empty state. Use the File menu options
"Open..." or "Import From Workspace..." to choose an image for display.

IMTOOL(I) displays the intensity image I.

IMTOOL(I,[LOW HIGH]) displays I as a grayscale intensity image,
specifying the display range for I. The value LOW (and any value less
than LOW) displays as black, the value HIGH (and any value greater than
HIGH) displays as white, and values in between display as intermediate
shades of gray. IMTOOL uses the default number of gray levels. If you
use an empty matrix ([]) for [LOW HIGH], IMTOOL uses [min(I(:))
max(I(:))]; the minimum value in I displays as black, and the maximum
value displays as white.

IMTOOL(RGB) displays the truecolor image RGB.

IMTOOL(BW) displays the binary image BW. Values o