MAC OSX PPT converting Windows PPT graphics to negative

L

Lblackman

I've been sent a ppt presentation from a Windows user. The
presentation includes a series of graphics -- newspaper cartoons in
black and white. When I open the slides with the cartoons about half
of them open in negative format, i.e. black is swapped for white and
vice versa.

When I send the presentation back to the Windows user he reads the
graphics in the normal positive manner. And some of them are fine.

Is this a known problem with some graphic images?

Is there a filter or converter I need / can use to switch these
graphics from negative to positive?
 

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