Using pictures can greatly enhance your presentation, but it can also result in huge PowerPoint (ppt) files that are difficult to store and share. Following a few simple steps, you will be able to keep the size of your ppt files down.
Always keep the original picture files, do not rely on being able to recover pictures from a ppt file because this will not be possible without a quality loss when the ppt file has been optimized.

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If the inserted picture covers the whole slide:

Resize and place the image precisely.
Repeat the above steps for all pictures you wish to insert.
Only do this step once you are done resizing all the pictures currently inserted.


(This level of picture optimization will considerably reduce the size of your ppt files maintaining sufficient quality for printing.)
You are done!