Subject | Re: Lenses and sharpening |
From | nospam |
Date | 09/20/2014 07:20 (09/20/2014 01:20) |
Message-ID | <200920140120420714%nospam@nospam.invalid> |
Client | |
Newsgroups | rec.photo.digital |
Follows | Savageduck |
smart previews are for when you don't have access to the original image. it's a proxy.SavageducknospamEric StevensSandmanSandmanEric Stevens
The *only* point Lightroom loads the original file and applies the rendering chain in RAM is when you're viewing an image in 100% zoom.
Or when you export the image.
Depends on how you export it. If you export it as a low-res highly compressed JPG, it can use the preview file. Chances are that it doesn't, but it certainly could, since the preview file *is* the current pixel data of the image.
So what happens when you want a high quality TIFF of the same size as the original file? Do you expand by resampling your low-res highly compressed JPG?
questions like this mean you don't understand how it works.
it *always* uses the original data. the cached previews are a speed optimization for the user interface.
That is how Lightroom Mobile works. It syncs *Smart Previews* in *Smart Collections* from LR5 to LR-M. Any edits, crops, ratings, etc., made in LR-M are synced back to the corresponding LR-M *Smart Collection*. All of those edits are made to previews, as the just isn't room for full size files in the Mobile devices. I have a 64GB iPad2 & a 32GB iPhone 5S. Currently Lightroom Mobile is using 267 MB with 5 Collections & 219 images, all as previews which are quite presentable on the iPad. This makes for a decent portable portfolio where each image retains all the iOS sharing options without the memory load on the iDevice Photos catalog. It always refers back to the original in LR5.