I have an app, targeting OS 10.4+, which creates graphs and saves them as
either PNG or EPS. The graphs are mathematical plots for which an image
depth of 8 bits is sufficient.
Creating the PNG is straightforward using
HIView --> CGImage --> QT --> PNG (file size typically 28K)
The EPS is generated "manually" by the program and, by itself, gives
essentially perfect printouts with a filesize of 4K or 8K. However, this
file requires a preview so that, when inserted into MS Word, the user will
have something to look at (besides a rectangle). I have always done this
using a PICT resource (#256) which Word recognizes.
The problem is that, if I use the sequence shown above to produce this PICT,
then the filesize increases to more than 600K (with display set to millions
of colors). [Note: a document could contain dozens of such pictures.]
Currently, my solution is to create a bitmap context with 8 bits per
component and redraw the graph into that, then save the result as a picture
in the same manner as with PNG (filesize typically 128K). However, this
seems to me to be a kludgy and roundabout procedure and I was wondering if I
might be missing something simpler. Am I?
Is it possible, for instance, to make the HIView in my window have a
256-grayscale depth instead of inheriting millions of colors from the
screen?
Or could the CGImage be reduced in depth before being turned into a PICT
resource?
Or some other possibility?
Thanks in advance for any tips.
--
Mike McLaughlin
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