What computer operating system is your Premiere Elements 12 running on? Premiere Elements 12 Mac does not have a Slideshow option in its Elements Organizer 12. So, that situation would not yield the two choices of creating the slideshow in the Elements Organizer and taking it into Premiere Elements OR doing the whole project solely in Premiere Elements.
What is going into this slideshow....photos (how many, original pixel dimensions), videos (formats and duration), etc?
What is a description of your computer resources?
How do you intent to export this slideshow...
a. burn to DVD-VIDEO standard or widescreen on DVD disc
b. burn to AVCHD format on DVD disc
c. burn to Blu-ray disc format on Blu-ray disc
d. to file saved to the computer hard drive?
We will customize a reply based on the information that you supply.
Just getting back to the Adobe Premiere Elements Forum now that Adobe has corrected some issues with it site.
To add to your thoughts on your slideshows and Photoshop Elements and/or Premiere Elements...
Although the above is targeted for Elements Organizer 11, it would be applicable to Elements Organizer 12 as well.
And, as mentioned before, no slideshow feature in Elements Organizer Mac, only Elements Organizer Windows.
We will be watching for your further comments.