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<A NAME="39383"></A>
<B>:halve</B> <EM>&amp;optional simage </EM>[method]

<DL COMPACT>
<DT> 
<DD> 
returns pixel-image that is shrunk into half-size image.
</DD>
</DL>
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<A NAME="39393"></A>
<B>:subimage</B> <EM>x y subwidth subheight </EM>[method]

<DL COMPACT>
<DT> 
<DD> 
cuts out a <EM>subwidth</EM> x <EM>subheight</EM> rectangular region
with its top-left corner at <EM>(x,y)</EM> of this image.
The origin of the image is taken at the top-left corner.
<TT>:Subimage</TT> returns a  n