Caching webpage preview images

Is there a way (secret setting? Terminal command?) to only cache webpage preview jpegs of my Top Sites? There really is no need for me to cache an image from a site that I happen to visit once a lifetime.
Thanks in advance.

Hello,
I found this
http://www.macosxhints.com/article.php?story=2009041808521944
and this
http://imnotbruce.blogspot.com/2009/06/safari-40-stealing-cpu-cycles.html
but I don't know if it really works
I was hoping to find a simplier manner

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How do you disable WEBPAGE PREVIEW IMAGES in Safari 4?

Since I checked the 'show webpage preview images' immediately after upgrading, I've been losing hard drive space like there's no tomorrow. Every time I visited a few sites for the first time with Safari 4, I'd lose 10 MBs. After a few days I lost over 200 MBs and had enough of it. So I went to Reset Safari and noticed that now you could 'remove all webpage preview images' without resetting anything else. When I did this, I got all my space back.
I don't see anyway to undo this feature. Top Sites and Cover Flow like integration with bookmarks are nice if you've got a big screen and hard drive.

I know this thread is "answered", but I'll chime in.
I locked the said folder, and it worked fine. However, this error was marked repeatedly, ad infinitum, in the console log, for every single page I visited:
<Error>: CGImageDestinationCreate destination parameter is nil
It was getting so out of hand, filling my console.log, I had to unlock the folder.
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Thanks

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Safari doesn't saves webpage preview images. It only save images for my Top Sites pages.
When I look in my history cover flow I only see blank Safari symbols (except history from my Top Sites webpages)
Well I really want to see full cover flow.
How can I fix this?
By the way, the Reader feature really cool and very useful.

By the way, I finally gets history to be saved. It fixed by Safari 5.
Yes, I saw your post on that one ... at least some incremental progress is being made ...
There's an area of Discussions (available only to the level 4 or 5 users) where we can post information about trouble we see out in the "public" forums ("Notable New Technical Issues"). I've been updating a thread on this issue with your progress so far with this. (I'm not sure if the Safari developers watch that though ... but just in case, I've been stashing info about this there.)
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Webpage previews is no longer caching pages. How do I make sure settings will cache all pages visited?

Webpage previews is no longer caching pages. How do I make sure settings will cache all pages visited?

The cache may be full ..
Using Safari ??
Open a Finder window. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following
~/Library/Caches/com.apple.Safari/Cache.db
Click Go then move the Cache.db file to the Trash.
Quit and relaunch Safari to test.

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Since the Safari Webpage Preview Fetcher process takes up to 10% of my CPU on occasion and and it uses bandwidth and it's just dumping loads of images into ~/Library/Caches/com.apple.safari/Webpage Previews is there a way to permanently stop this process from ever starting up again?
I've blocked it with Little Snitch to see if it that stops it but I don't think it has. Has anyone successfully stopped this process for the long term?
Message was edited by: W. Raider

i'd like to permanently stop that as well.

How do I get webpage previews to appear in Safari bookmarks?

How do I get webpage previews to appear in Safari bookmarks? There are some entries in my Bookmarks List that have no preview images, and I want them all to appear. How do I do this?

HI,
Empty the Safari cache and see if that helps.
From the Safari Menu Bar click Safari/Empty Cache...
Good tips here for Safari. Safari on a Nutshell
Carolyn

Preview image does not match content image

I have been using Bridge CS3 on MAC OS X 10.4 for about 2 years and have happily used it as part of my image processing work flow for thousands of images. A Canon 1DS is my main camera. Some time ago I have started using a Canon G9 in addition to the 1DS. So far so good.
Recently and for no reason I can see, Bridge has started displaying an entirely different image in the preview panel than the image selected in the content panel. This only seems to happen when selecting RAW G9 images in the content panel; the image shown in the preview panel will be a processed PSD file originally taken on the 1DS, or a 1DS RAW image (of an entirely different subject and processed months earlier). Needless to say, the file name format of RAW G9 images and processed / RAW 1DS images is entirely different. What ever Bridge is using to marry content image selected with preview image displayed, its getting it wrong. I should add that that this doesn't always happen all of the time - but it does happen about 25% of the time.
When I open in ACR I get the correct image. Also Bridge meta data refers to the correct image. It is just preview that is incorrect.
I have compacted and refreshed the cache. This resolves the issue the first time I go back in and select images from the content panel, but if I reselect, I'm back where I started.
Has anyone ever experienced this?
(in preferences against "When Creating Thumbnails Generate:" I have "Convert To High Quality When Previewed". Also I have both "Use Software Rendering" and "Use High-quality Previews" checked. I'm using Bridge CS3 2.1.1.9)
Many thanks, Tom

I had this with my Canon30D files as well. Spurious previews. I met with Adobe in person and went over this. I then moved to Bridge 3.x and went over why I needed high quality images and the person I was working with took many copies of my images to work on the high quality previews.
I found when I went to one of the 3.x versions of Bridge, this was corrected and I got to use High Quality without the spurious previews.
I did not have to give up my High Quality. At least not in my case.
I will note that I was on the prerelease member site and so did get Bridge 3.x versions that may not have made it to the public, hard to know as I have since moved on to CS4.
I remember a time when I could not use the global purge command and had to throw away all cache folders but this is no longer the case.
I think Adobe did all they could to fix this issue and still feel that it was incredible that they met with me several times and did conference calls with 6-7 engineers in the room with me and how they really seemed to want to know what was up.
So I, for one, cannot say there will remain a black eye. Adobe was very supportive with me.
b One thing though, I could not use "software render" ever with any success.

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I can select "View image info" from the context menu and then the image is correctly displayed in the pop-up window.
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I have about 35,000 photos in the library, spread over about 1600 events.

CS3 Bridge: Preview image too small

Hi,
Here's what I'm using:
Photoshop CS3: 10.0.1
Bridge: 2.1.1.9
ACR: 4.6.0.30
No matter what mode I coose (lightbox, horizontal/vertical filmstrip ...), the preview image occupies a very small part of the preview pane and I find no way to resize it. The thumnail pane and the thumbnail images themselves are resizable all right.
I tried purging the cache and that didn't help.
Any help would be very much appreciated.
Thanks,
Prabal.

Hi,
I wanted to report another experiment that possibly points out where the problem is.
Case 1:
I placed the preview and content panes one above the other. Like so (preview pane at the top):
Then I started pulling the horizontal separator between the two panes to shrink the size of the lower pane and this caused the preview image to starting to get bigger to fit the preview pane real estate space. Look at the image below (and note that the bigger image is not rendered correctly) and note that at the time of taking the screenshot, I did not yet release the horizontal separator:
Finally, just as I released the horizontal separator bar, the image in the preview pane got resized to its initial small size:
Any clue?
Thanks,
Prabal.

Poor quality in preview - image is blurry

To date, I have not had any issues with the preview quality matching the actual image quality.
I have not made any hardware por software changes. Image files are in raw, jpg and tiff formats.
This issue appears to be only with raw files. The image in preview is extremely blurry, yet when the
file is opened it is tack sharp. I have checked all my preference settings and cannot figure out what is goin on.
I have tried purging and refreshing the cache and nothing seems to work.
I am running PS CS4
Windows Vist 64 Ultimate
Please help!
Update: I have changed raw preferences to apply to preview images only. The image qulaity only seems to improve when I
purge the cache for the slected images. I have the cache option for export to folder when possible checked. I have tried to purge the cache for
all images but the preview does not imprevoce unless I purge selected only.

This may be dumb but when it recently happened to me, I opened one image in adobe camera raw and increased the clarity by an inpercievable 1%. Then I hit done. Preview looked crisp again. I copied settings of that image. Then I highlighted all other blurry previews and pasted settings and they all became crisp again. Probabley just a quick fix that doesn't solve the problem but my knowledge is limited.
-mark

Aperture 3: low quality preview images

I don’t know if it's just a problem with my (new) Aperture Trial library or if it's a Aperture 3 bug:
The preview images Aperture 3 (trial) creates from raw files (in my case NEFs) are different from the JPEGs exported using the same JPEG settings.
I get the impression that the preview images don’t use all the adjustments applied to the raw files. They don’t have the moire reduction applied. The preview images of high ISO images have color noise, the exported images don’t have that color noise (the moire and noise settings of raw fine tuning are applied to the exported files but not to the image previews).
As the preview images are used for the Finder media browser, iLife, iPhone/iPod touch picture sync and other things the lower quality is not acceptable for me.
The preview images of Aperture 2 are identical to the exported JPEGs from Aperture 2 (using the same settings).
I use Aperture 3 Trial with a new trial library and a few hundred raw images just to test Aperture 3.
I already erased all preview images and rebuild the previews. I deselected using the embedded JPEGs from the raw files and I let Aperture rebuild the miniatures.

It seems that Ap2 syncs the previews to the iPhone... you have to clear the previous cached previews before it will load higher quality previews... anyhow, here is what I did... and photos look better on my iphone (not feeling motivated enough to verify if it is the same quality as iphoto sync)...
1.) change Ap2 prefs for "limit preview size" to "don't limit"...
2.) select all the photos in the album(s) you are want to sync, right click (ctrl click), and select delete previews...
3.) sync your iphone again...
if that doesn't work directly, you might need to uncheck sync photos to delete all photos on the iphone, but the ultimate goal is to ensure refresh with the higher quality previews...
Hope that makes sense or gets folks in the right direction... Apple really needs to put a check box in future version of itunes to sync full quality or something...

Can I force Photoshop CC to regenerate preview images?

I have a photoshop file that seems to have corrupted preview images. When I look at the file in bridge I only see a photoshop icon. I have tried the following solutions, all unsuccessfully:
    clearing the bridge thumbnail cache
     saving the file as a copy in photoshop.
     restarting my system
Photoshop CC 64, Bridge CC 64, Windows 7 64bit
Preferences->File Saving Options-> Image Previews is Always Save
Any other suggestions?

This doesn't seem to solve the problem as the new file also does not show a preview image.
Puzzling indeed!
I did notice, however, that most metadata also appeared to be gone (bridge reported no color profile,
or pixel dimensions for example). This suggested an alternative approach. I opened the original .dng
file again and then copied the layers from the damaged .psd per this suggestion. When saved, there was
a preview! However, it was only a preview of the base conversion. No matter what layers are visible when
the file is saved, the preview doesn't change. Still not right. I hesitate to continue to work with an obviously
corrupted file.

No Safari Bookmarks Preview Images

Hi,
some of my Safari Bookmarks in Cover Flow Modus don't show a preview image.
They just seem to get lost from time to time. And I always had this problem. With every OS and Safari, no matter which version.
How can I assure to always have preview images of my bookmarks or trigger that they'll come back?
Thanks,
Melros

Ok, interesting to hear. Thank you.
But it never felt like Safari would do it automatically. And beside, why should the cache be "full" by sometime? There's enough space on the drive.
But here's a solution I just found out for now:
After deleting the cache (and I guess it would also work for single sites without an recent preview image) I just opened the page again and let it fully load. Then the preview image is back again.
So I did it with all my folders now and it seems to work again. But sadly again not for all. There are still some with no preview images in between where even reoping the page doesn't help.
Quick tip for user who are trying this method: You can simply right click on a bookmark folder and open all bookmarks in tabs. So you won't have to open every single one.
Future solution idea for Apple:
I wish Apple would take care about it automatically. (if they already do we see that it doesn'r properly work yet). So that the images just won't get lost in the first place or at least offer a kind of "refresh all bookmark previews".
From now I'll keep an eye on when they get lost again and will get back on this post if I find out something new about it.
So thank you Carolyn for you help here! : )

Here is a function to read preview images from active catalog

--- Get a preview image corresponding to specified photo, at the specified level, if possible.
-- @param photo (LrPhoto or table of param, required) specified photo or table of named parameters same as below including photo=lr-photo:
-- @param photoPath (string, optional) photo-path if available, otherwise will be pulled from raw-metadata.
-- @param previewFile (string, default=unique-temp-path) target path to store jpeg - if non-vil value passed and file is pre-existing, it will be overwritten.
-- @param level (number, required) appx sizes + intended use:
-- 1 - 80x60 small thumb
-- 2 - 160x120 medium thumb
-- 3 - 320x240 large thumb
-- 4 - 640x480 small image
-- 5 - 1280x960 medium image
-- 6 - 2560x1920 large image
-- 7 - 1:1 full-res
-- @param minLevel (number, default=1) minimum acceptable level.
-- @usage file, errm, level = cat:getPreview{ photo=catalog:getTargetPhoto(), level=5 }
-- @usage file, errm, level = cat:getPreview( catalog:getTargetPhoto(), nil, nil, 5 )
-- @return file (string, or nil) path to file containing requested preview (may be the same as preview-file passed in).
-- @return errm (string, or nil) error message if unable to obtain requested preview (includes path(s)).
-- @return level (number, or nil) actual level read, which may be different than requested level if min-level passed in.
function Catalog:getPreview( photo, photoPath, previewFile, level, minLevel )
 if photo == nil then
 app:callingError( "no photo" )
 end
 if not photo.catalog then -- not lr-photo
 photoPath = photo.photoPath
 previewFile = photo.previewFile
 -- assert( photo.level, "no level in param table" )
 level = photo.level
 minLevel = photo.minLevel
 photo = photo.photo
 -- assert( photo and photo.catalog, "no lr-photo in param table" )
 end
 if level == nil then
 app:callingError( "no level" )
 end
 if level > 7 then
 app:logWarning( "Max level is 7" )
 level = 7
 end
 if photoPath == nil then
 photoPath = photo:getRawMetadata( 'path' )
 end
 local photoFilename = LrPathUtils.leafName( photoPath )
 local _previewFile
 if previewFile == nil then
 _previewFile = LrPathUtils.child( LrPathUtils.getStandardFilePath( 'temp' ), str:fmt( "^1.lrPreview.jpg", photoFilename ) ) -- include extension, since there are separate previews for each file-type.
 else
 if fso:existsAsFile( previewFile ) then
 app:logVerbose( "preview path passed is to existing file to be overwritten" )
 end
 _previewFile = previewFile
 end
 local imageId
 local s = tostring( photo ) -- THIS IS WHAT ALLOWS IT TO WORK DESPITE LOCKED DATABASE (id is output by to-string method).
 local p1, p2 = s:find( 'id "' )
 if p1 then
 s = s:sub( p2 + 1 )
 p1, p2 = s:find( '" )' )
 if p1 then
 imageId = s:sub( 1, p1-1 )
 end
 end
 if imageId == nil then
 return nil, "bad id"
 end
 local cp = catalog:getPath()
 local fn = LrPathUtils.leafName( cp )
 local n = LrPathUtils.removeExtension( fn )
 local cd = LrPathUtils.parent( cp )
 local pn = n .. " Previews.lrdata"
 local d = LrPathUtils.child( cd, pn )
 local pdb = LrPathUtils.child( d, 'previews.db' )
 assert( fso:existsAsFile( pdb ), "nope" )
 --Debug.pause( pdb )
 local exe = app:getPref( 'sqlite3' )
 if not str:is( exe ) then
 if WIN_ENV then
 exe = LrPathUtils.child( _PLUGIN.path, "sqlite3.exe" )
 else
 exe = LrPathUtils.child( _PLUGIN.path, "sqlite3" )
 end
 app:logVerbose( "Using sqlite executable included with plugin: ^1", exe )
 else
 app:logVerbose( "Using custom sqlite executable: ^1", exe )
 end
 local param = '"' .. pdb .. '"'
 local targ = str:fmt( "select uuid, digest from ImageCacheEntry where imageId=^1", imageId )
 local r1, r2, r3 = app:executeCommand( exe, param, { targ }, nil, 'del' )
 local uuid -- of preview
 local digest -- of preview
 if r1 then
 if r3 then
 local c = str:split( r3, '|' )
 if #c >= 2 then
 -- good
 uuid = c[1]
 digest = c[2]
 else
 return nil, "bad split"
 end
 else
 return nil, "no content"
 end
 else
 return nil, r2
 end
 local previewSubdir = str:getFirstChar( uuid )
 local pDir = LrPathUtils.child( d, previewSubdir )
 if fso:existsAsDir( pDir ) then
 -- good
 else
 return nil, "preview letter dir does not exist: " .. pDir
 end
 previewSubdir = uuid:sub( 1, 4 )
 pDir = LrPathUtils.child( pDir, previewSubdir )
 if fso:existsAsDir( pDir ) then
 -- good
 else
 return nil, "preview 4-some dir does not exist: " .. pDir
 end
 local previewFilename = uuid .. '-' .. digest .. ".lrprev"
 local previewPath = LrPathUtils.child( pDir, previewFilename )
 if fso:existsAsFile( previewPath ) then
 app:logVerbose( "Found preview file at ^1", previewPath )
 else
 return nil, str:fmt( "No preview file corresponding to ^1 at ^2", photo:getRawMetadata( 'photoPath' ), previewPath )
 end
 -- this could be modified to return image data instead of file if need be.
 local content
 local function getImageFile()
 local p1, p2 = content:find( "level_" .. str:to( level ) )
 if p1 then
 local start = p2 + 2 -- jump over level_n\0
 local p3 = content:find( "AgHg", start )
 local stop
 if p3 then
 stop = start + p3 - 1
 else
 stop = content:len() - 1
 end
 local data = content:sub( start, stop )
 if previewFile ~= nil then -- user passed file
 app:logVerbose( "Writing preview into user file: ^1", _previewFile )
 else
 -- rename file to include level.
 local base = LrPathUtils.removeExtension( _previewFile ) .. '_' .. level
 _previewFile = base .. ".jpg"
 app:logVerbose( "Writing preview into default-named file: ^1", _previewFile )
 end
 local s, m = fso:writeFile( _previewFile, data )
 if s then
 app:logVerbose( "Wrote preview file: ^1", _previewFile )
 return _previewFile
 else
 return nil, m
 end
 else
 return nil -- no real error, just no preview at that level.
 end
 end
 minLevel = minLevel or 1
 local status
 status, content = LrTasks.pcall( LrFileUtils.readFile, previewPath )
 if status and content then
 repeat
 local file, errm = getImageFile() -- at level
 if file then
 return file, nil, level
 elseif errm then
 return nil, errm
 elseif level > minLevel then
 level = level - 1
 else
 return nil, str:fmt( "No preview for ^1 at any acceptable level", photoPath )
 end
 until level <= 0
 return nil, str:fmt( "Unable to obtain preview for ^1", photoPath )
 else
 return nil, str:fmt( "Unable to read preview source file at ^1, error message: ^2", previewPath, content )
 end
end
This function is working great so far, but as of 2011-09-29 it has not been rigorously tested, so it may have a bug or two...
It is based on the elare plugin framework available here (including source code): https://www.assembla.com/spaces/lrdevplugin/
You will need sqlite3 executable from here: http://www.sqlite.org/sqlite.html
- put it in lr(dev)plugin dir
Note: view-factory's picture component will accept a path as resource id, so to use:
local pictureFile, errm = cat:getPreview( photo, nil, nil, 4 )
if pictureFile then
 items[#items + 1] = vf:picture {
 value = pictureFile,
end
Note: the above code is intended for "sample/example" only -
MUST DO:
- Handle portrait orientation properly...
MAYBE DO:
- Handle AdobeRGB profile assignment - not needed for thumbs, but maybe for the biggies...
- Optimize for multi-photo use.
- Change detection for sake of caching for repeated access (like scrolling thumbnails).
@2011-10-04, the code at Assembla.com (see link above) takes care of all these things, and then some...;-)
Rob

Thank for so interesting and undocumented feature. Where you get it?
[quote]In Mac version there's a file called Contents/PlugIns/MultipleMonitor.lrmodule/Contents/Resources/LrPhotoPictureView.lua[/quot e]
On my version of Lr3 this lua script is compiled. Did you puzzle out decompiled code?
Unfortunatelly, there are some issues with this way of getting preview:
1) sqlite doesnt work with localized paths like i,e c:\users\Администратор... I tried to solve it with using utf8 or uri formats for path but useless. I solved it with usind short form of path (in windows. On mac I didnt yet tested it). To get a short form of path I use a simple script launched in cmd shell, some like "echo %~s1" and it take a shorf form of path i.e.
C:\Users\836D~1\...
 instead of
C:\Users\РђРґРјРёРЅРёСЃС‚СЂР°С‚РѕСЂ\
2) The main problem is what if I work in "Develop" mode and if I change an image setting then previews will not be refreshed until I dont switch into "Library".
Maybe somebody know a way how to push Lightroom to refresh previews db into "Develop" mode?
Of course, all it is actually for Lr3 and Lr4 only. In Lr5 there is another API for get smart preview. But I would like to support and Lr3-4 audience also

Delete Webpage Preview Fetcher?

So... I'm still trying to get a grasp on these large webpage preview caches. I will never use Top Sites, so it is useless to me.
What if I were to delete the Fetcher from Safari---> Show Package Contents? (I understand I may need to compress it first). What would be the ramifications of such an action? Has anyone else tried this?
I just want these Gigs of useless caches to stop!
Thanks in advance

Hi
That's a good question. I haven't tried it yet. If you feel so inclined, make a copy of Safari.app first (command/D keys), then make the change. Restart Safari and see what happens. If Safari crashes, you got your answer. Move to the trash Safari.app. Then, rename Safari (copy).app to Safari.app and you are back to square 1.

Caching webpage preview images

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