This is most likely because they were created as CMYK images, which is what
is needed for print design. PowerPoint works with an RGB color space. So
depending on what version of PPT and how you are inserting the images into
the presentation it is converting the images from CMYK to RGB, which have
different ways of displaying colors.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.