Mosaic_Preview has two options that it works with, Preview_Start_Size and
Preview_End_Size. The documentation is clear about what they do. But the
'wording' of Preview_End_Size is kind of misleading, as to its function: the
render *continues* anyway, until every pixel is rendered (i.e., the 'end size'
is 1 pixel, when thought of this way, even if Preview_End_Size is set to 32, for
example.)

I do realize that the docs' meaning of 'preview' is... 'PRIOR to the final
every-pixel render.'  But I would like to suggest a change to the operation of
Preview_End_Size: that the render actually end when that pixel-size is reached.
My reasoning is this: If the idea is to do a quick blocky 'preview' of a render,
to see the scene in a rather gross way for quickly determining any problems,
then continuing to render down to a single pixel is 'overkill', IMO, for two
reasons. It kind of defeats the purpose of the gross preview; and it takes more
time to render (... the final pass...) if just a blocky preview is wanted.

My two-cents, anyway.

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