Scale image from small to large(r) without losing resolution

Question

Does anyone know how I can create a "scale action" of an image on a slide from small to large without losing the resolution of the image. Now, when I reduce the size of an image as a starting size and use Scale from the inspector to scale the image to e.g. 200% the images looks very blurred. I want the image in the larger form to have a good resolution.
Thanks for your help.

Answer 1

That's an interesting bug you've identified -- an image that is reduced by 50% and then scaled up to 200% with a Scale action looks blurrier than the original image at 100%. It seems like Keynote is scaling up the reduced image, rather than "removing the reduction" on the original.
One solution that works well is to make a copy of your original image at the final size you want the scaled image to be, then place this copy on top of the scaling image, and build it in immediately after the scaling action with a dissolve build in that starts automatically after the scaling action. What this will do is give you the scaling effect, but at the final size, the full(er) resolution version will dissolve on top of the lower-res version. This procedure is more cumbersome than having the scaling effect work properly, but the result is quite acceptable, and the second dissolve build is pretty much imperceptible.