[cairo] Use /Interpolate for PS?

[Chris Wilson]

Working through my pedagogical PS interpreter, I spotted that we do not
specify the /Interpolate flag for images (PLR p301). Is there a reason
why we leave it at the default value (off)? The PLR says that the
default is off as it may increase the time to render, and that the
actual algorithm is undefined... 
-- 
Chris Wilson
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