Limit Preview Size option

As a new user to Aperture, I am reading Luna and Long's Aperture 1.5 Pro Series book.
In the preferences option for Limit Preview Size, the book shows a drop down menu that shows specific monitors (i.e. 30" Cinema Display, etc). My preferences do not show my monitor (30" Cinema) and I am wondering if there is something I can do to get it to display in those preferences.
Mac Pro Mac OS X (10.4.8)

Hi Guys,
The asterisk is maximised to your monitor size.
My prefs show only the Res size too & not as per Luna / Long book.
Check out the excellent Bagelturf site on Previews
http://homepage.mac.com/bagelturf/aparticles/previews/pwho/pwho.html
G

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Limit Preview Size. Which setting are you using?

I'm not exactly sure how the Limit Preview Size preference affects my workflow. Which setting are you using, and why?
My preference is currently set to the v2.0 default 1/2 Size. My iMac's resolution is 1680x1050, and I'm using the Canon EOS 1D Mark III taking full size RAW images at 3888x2592.
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Gregory,
I use the default (which is 1/2 size) with no ill effects. Previews are used by external programs to gain access to photos in your Aperture library. (This is not the way your external editor works, though.) Your preview size will not affect your workflow. When previews are turned on, Aperture works on generating previews when you have something new of which to make a preview. I seriously doubt that making a small copy, versus making a smaller copy, would affect how long it takes Aperture (and therefore, how sluggish Aperture might appear.) The difference between making previews and not making previews can be significant.
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Speed-up? - Force a rebuild of Preview Size

Folks
Many people say they experience an increase in speed by having smaller previews. The default Preview size, in 1.5, as set in Preferences under 'Limit Preview Size' is 'Don't Limit'.
If you alter this setting to a smaller setting it does not alter the size of your existing Previews. Some folks suggest throwing away all your Previews and starting again. However - Tech article 304345 suggests an easier/better way
Aperture: Previews do not update after changing Limit Preview Size Preference
Solution:
Issue or symptom
After you change the Limit Preview Size setting in Aperture's Preferences, existing previews are not changed, even if you choose Images > Update Previews.
Products affected
Aperture 1.5
Solution
Changing the Limit Preview Size setting does not mark existing previews as out of date. In order to force existing previews to be regenerated using a new size setting, select the desired images, press Option and choose Images > Generate Previews.

Is there a way to easily tell which pictures have unwanted preview sizes? I started building previews (36,000 pictures)with the aperture default setting (unlimited size) and a day-and-a-half (approximately 24,000 pictures) later switched to the size recommended for my display. Aperture is definetly running slower than before I updated to 1.5. If there isn't an easy way to identify and resize the "unlimited size" photos, am I better off just deleting all previews and rebuilding them from scratch, or should I just rebuild as needed for purposes of ilife integration? I like the idea of being able to view all pictures in my Aperture library for purposes of using in other applications but if it is in fact slowing down Aperture I will happily rebuild.
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I'm working on a Macbook pro, with hi-res 17" screen 1920x1200. In most manuals, tutorials etc. it says that you can "set the standard preview size fitting for your screen".
I'm looking for some more background info on the standard preview, to decide which setting to use(if somebody has other criteria to keep in mind please do say so):
1) What is the difference in size of files for the different combination of options (pixel/quality). Does somebody have a list.
2) What is the actual difference in the quality options
3) In which modules is the preview size used (also in development and slide show?)
4) Are they also used to generate the thumbnails from? If so, does a higher standard preview size reduce the performance in library mode because it as to shrink bigger files for these thumbnails?
5) what happens if I would use the smaller, let's say 1440 preview and then decide to view the picture full-size, in library or slide show
6) What would be the size (in pixels) on the normal main window in lightroom on my 1920x1200 screen. if it is about 1440 (might take that one)
Last question of course: What standard preview size / quality should I use on my 1920x1200 screen??
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As to standard preview size and quality, try 1440 and 1680 and Med and High quality and see what you like best. You will probably choose 1680 size for your screen running at 1920x1200. That will let you run LR full screen where the image size will be close to the full size of your monitor. You can try 1440 too but I doubt that you will see any performance improvement. I have tried both sizes on my 1600x1200 monitor and I see no difference in quality or speed.
Try both Med and High quality and see if you notice any difference in your preview quality or speed. High will make your preview folders bigger which might be a factor if you have limited hard drive space.
Don't think preview size has anything to do with thumbs. Standard previews are separate from 1:1 previews so you can always zoom in and LR will generate a full size preview.
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Errors when using "Limit file size to" when exporting images

When I try to use the "limit file size to" option in Export, I often get at least one image that doesn't export, and I get a dialogie box like the image attached here:
As I am exporting in batches, it geats really messy and risky too!I have tried various file size options but that doesn't seem to be a factor.
Any ideas on solving this, or is it an unfixed Lr bug?!
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I can't reproduce it here, so you could try trashing the preferences file http://members.lightroomqueen.com/index.php?/Knowledgebase/Article/View/1148/198/how-do-i- delete-the-lightroom-preferences-file
If that doesn't do the trick, post it on the Official Feature Request/Bug Report Forum

Standard Preview Size/Preview Quality

This may be a silly question, but in Library mode, under Edit>Catalogue Settings>File Handling, you have options under Preview Cache for 'Standard Preview Size' (1024/1440/1680/2048/2880 pixels) and Preview Quality (High/Medium/Low)... but what do these settings actually do; I've tried changing them & not noticed and difference??

Les_Cornwell wrote:
Thanks again Rob
You bet .
Les_Cornwell wrote:
I've tried all the different size options, namely 1024 through to 2880 & low/Medium/high and none make any obvious difference at all.
So are previews only created as required when you view a picture in full screen mode or does LR create a preview for all your files?
Every image you look at in Library module comes from the (library) previews, there are up to 8 possible jpegs:
* a tiny thumbnail in root-pixels.db
* up to 7 jpegs ranging from small to 1:1 in the "preview pyramid" (each smaller is half the dimensions of it's bigger sibling).
Try this with a 10 photo test catalog:
If you have a big monitor and set standard preview size to 1024, then (with Lr closed) delete all previews, then restart Lr and wait for all the "..." indicators to be extinguished (indicating standard previews have been built), then step from photo to photo in loupe view with all panels collapsed (loupe view "real-estate" maximized), you should see "loading" indicator, since it needs a bigger preview than you've got built. What it will do then is build 1:1 previews and all the smaller ones along with it, which is suboptimal from a performance point of view. If you try and zoom in to 1:1 after the "loading", there will be no additional loading, since 1:1 previews were already built.
Then, repeat the test with preview size at max - no loading indicators, right? (when stepping in loupe view after standard previews have finished being built, I mean). Except now if you try to zoom in there will be "loading", since 1:1 preview were not required to display the loupe view, they will need to be built for the zoomed (1:1) view.
The only difference between big enough and too big will be an ever-so-slightly greater lag when stepping in the loupe view and no 1:1 preview exists (when preview is too big I mean), since it's loading a bigger standard preview than is actually needed. Reminder: if preview is not big enough, there will be an ever-so-slightly bigger lag when stepping in loupe view too (e.g. vs. just big enough), since it's using the 1:1 preview instead of standard (which wasn't big enough). So, tester beware... (somewhat counter-intuitively, in some cases, it will be faster loading a preview when settings are, in general, too big, because it can get away with loading the next size down, which is an even better fit, e.g. if image is cropped just so - all of these little nuances make it especially tricky to test & evaluate, so consider doing initial tests using uniform-size uncropped images, to reduce the number of variables - it's confusing enough as it is ;-}).
Note: as previously mentioned, there is considerable complexity (and bugs) in the preview system, and I may not have described it perfectly, so it wouldn't surprise me if your results were not exactly like that, but I just went and retested on my system, and what happened is exactly as I described above (win7/64), as I read it anyway...
Regarding quality, you should see difference in some photos not others, but ONLY if it didn't resort to the 1:1 preview which may be higher quality than the standard and is independent of the standard quality setting. (I think somebody may have stated that you'd need to zoom in to see differences in standard preview quality settings, but that is wrong - the only way to see differences in standard preview quality settings is if you are in fact viewing standard previews, which you aren't when zoomed in to 1:1, and anyway it can be ellusive - see paragraphs above...).
PS - If you want to compare jpeg quality of standard previews, one way is to export them using PreviewExporter. Again, it's tricky, since you need to assure you aren't exporting a scaled down version of the 1:1 instead of a true standard preview. After exporting you can compare outside Lightroom, so you don't have the "preview of a preview" issue going... I use Beyond Compare by Scooter Software for doing objective comparison of like-sized jpegs, but you can compare subjectively using any ol' viewer, e.g. as built into OS.
Too much?
UPDATE:
Les_Cornwell wrote:
does LR create a preview for all your files?
No - they are created on an as-needed basis (thus the reason we hear many complaints about how stale or non-existent previews should be built in the background, to minimize "loading" in library module, e.g. after making dev changes to a large bunch), but note: standard previews may be considered "needed" when thumbnail is in view in grid or filmstrip (but not considered needed if thumbnail is off-screen, even if existing in filmstrip and/or grid).
R
Message was UPDATED by: Rob Cole

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From the [User Manual|http://documentation.apple.com/en/aperture/usermanual/index.html#chapter=6%26sec tion=15%26tasks=true]
Message was edited by: Kirby Krieger

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