Keynote converter to pdf I'd like to hide some parts of the pictures, that I import to keynote presentation (I use version 6.2 (1861)). To do this I overlay white rectangles without shades on top of these parts of the images and use white color as a background color of the slide. 

However, when I convert a slide with an overlaid rectangle (although the background is white and the rectangle is filled with white) I get an artifact: thin edge line of the rectangle in black on my pdf. How can I get rid of it?
I would suggest to use a simple app like Paintbrush.

Modify, crop or cut the image to your liking.

Save it with new name (to keep the original).

This way you wont have the problems of trying to hide it in Keynote.