Cannot reduce the size of previews.lrdata

Hi all

My Previews.lrdata folder is 45 GB. On a 500 GB SSD (end 2013 15 "MacBook Pro retina), it is a reasonable piece.

So I went through and used the menu option "ignore surveys 1:1..." in all the pictures that I do not expect to change again. Somewhat to my surprise, the Previews.lrdata folder did not file size of 1 byte. I used the option "optimize catalog", but that doesn't seem to do anything either.

I prefer not to empty the cache of the preview while suppressing the Previews.lrdata, regarding the last pictures I've not edited and yet I enjoyed having to previews pre-rendered 1:1.

I don't expect too much here? Should not be a relationship between throw me 1:1 previews and a reduction in the size of the Previews.lrdata folder?

Thank you


Nick

ntompson wrote:

So if I reduce the size of the standard preview for the screen resolution below, then Lightroom uses only brief (down-scales) 1:1...

That is right.

ntompson wrote:

What are the downsides to this?

No - your standard previews have been set too high before.

ntompson wrote:

Why have a standard preview at all?

For reasons of performance - faster to enter/resize some smaller if he wants to.

ntompson wrote:

Would I better off put the standard preview to the smallest possible size?

Lol if you do this, then Lr re - will make a brief 1:1 for fit view, even if a standard preview was already available (because it would be too small). Certainly, if the 1:1 Preview is already available, it wouldn't need the re - make, but if you are when they expire, it may not be available, and despite this, it takes more time to load/resize a larger and a smaller preview.

ntompson wrote:

When I do the standard preview size change in Lightroom, then does invalidate all standard previews in my catalog? Does crank through and to regenerate all the standard previews to the new size?

No and no (but in my opinion, the user should be prompted to see if he/she would like to rebuild so size or quality changes).

In many cases, the difference over having a frame is too small or too large a framework, will be almost (or totally) without consequence. To be honest, I'm surprised that adobe exposed this option to the user, since most users have any idea what optimum setting should be. If I were Adobe, I suppose that Lr/hand-UI would be on the bigger screen and automatically size previews accordingly. Often when I mention this, people point out that the same catalog can also be used on a laptop, review how would be more optimal, and there are other considerations double monitor.., but hey - whatever...

PS - Lightroom creates different preview (up to) 7 sizes: from 1:1 to little thumb. When he creates a large preview (1:1 or standard), he created all the smaller previews also, in halfening size. It is very fast, and no doubt explains the reason why it will not throw a 1:1 if next (standard) would be more than half it's size (it's actually only create 6 previews in this case: 1:1 through thumb, there is no big standard preview size you specified in this case) (, or if you prefer another way of seeing things: the preview of 1:1 is your largest standard preview).

If you want to better understand what is stored for previews, you can play with the PreviewExporter plugin I wrote (free) - it allows you to specify at what level (1-7) to preview you want to export, and if you enable verbose logging will provide info on what was available, and what level of preview has been exported. Here is an excerpt of "post-process action" (export filter) UI:

See you soon,.

Rob

Tags: Photoshop Lightroom

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