Why do my images from Lightroom 4 have a very low resolution, look pixelated or are in a different e

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        <div class="EmbeddedContent"><strong>Why do my images from Lightroom 4 have a very low resolution, look pixelated or are in a different edit state than in Lightroom itself?</strong>
           <p>To get image versions of your photos that contain all the adjustments you made to the picture, we need to rely on the JPEG previews Lightroom generates. Sometimes these don't get updated or are set to a low resolution.  To fix that, there are two possible solutions:  1. Open Lightroom and make sure you are in the </p>
           <p><a href="http://boinx.com/knowledge/fotomagico/library-integration/WS03160">Read the full story here</a></p>
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Thanks for this tip. It does not work for me for some reason. After discarding previews for selected images and rendering 1:1 Preview , Lightroom says “No 1:1 previews were rendered. All 1:1 previews were up to date”. And I still get pixelated slideshow when I press Command+Enter. Please advise how can I see real quality previews on my retina screen. I have checked preview resolution in the Catalog settings. I expect it to generate previews with 2880 resolution…

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When Lightroom tells you that no previews where rendered and you still see the old once, then your “discard preview” step didn’t work out. You mentioned that you discarded the previews only for selected images? Did you try to use the “Discard all Previews” command?

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It seems to make more sense to me to Export from Lightroom and have control of the resolution of the photos that are going into the slideshow. If that’s the case, what pixel dimensions would you suggest for a 1920x1200 resolution projector, especially if for some images one will be zooming into the image on the screen.