Changing Images from CMYK to RGB and file size

Hello and Thank You in advance...
I'm new to Keynote and I created a slideshow with CMYK image and it is a certain size. When I resaved the images (same name, same location) and resaved the Keynote document, there is no change in file size. Is there a way to update the images in the slideshow?

Keynote puts the images INSIDE the .key file.
The best way to fix this is Control-click on a copy of your .key file and choose Show Package Contents.
Then select your NEW images in the finder and choose COPY (I know, it sounds weird, but the finder in OS X can use the Copy option to actually copy files).
Then click into the open .key folder and PASTE. You should get a notice that the images inside the folder already exist and do you want to replace them. Choose yes.
Close the folder and open the .key file and see if it worked okay.

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