Camera Raw Cache Files

Wondering if there is any guidance on retention of .dat files in the folder called User\Local Settings\Application Data\CameraRaw\Cache. I have close to 1 GB of .dat files in that folder, and am looking for ways to keep down the storage in my O/S (boot) partition.

1Gb is the minumum size. Do not put this file on the OS partition. Ideally you want this file on a physical disk other than the OS disk.
You can safely purge the cache but it just grow in size as you process raw files.
More information: Work with the Camera Raw cache

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I just found an error in the file name for my Camera Raw Cache file. How do I correct it?

I just found an error in the file name for my camera raw cache file. The error is in my username. I don't know how to correct the error or if I should just leave it. I'm not sure where my cache file is stored on my computer. Any help would be appreciated.
Thank you

Since you are on a Mac if when you first set up your account you left out the i in Wilson nothing you do will change that. The REAL account name will always be alicewlson. Once an account is created you can't actually change the name of it. You can change the name that is displayed but not the REAL account name.
Simplest thing to do is stop worrying about it. Everything is as it should be, that is except Wilson being spelled without the i.
Lilac50 wrote:
When I searched finder for "alicewlson" I found a long list of files like this:
2014-07-22 12.50/File005.nef[15:16:35.212] (debug) src/ImageLoader.cpp:363: File: /Users/alicewlson/Recovered/2014-07-22 12.50/File002.nef[15:18:02.173] (debug) src/StoreXMLFile.cpp:21: /Users/alicewlson//.rpro/rpro.cfg
I believe I made the error in my user name when I first got my computer a year ago. I then corrected it under my user name but not in my Lightroom files. I also looked for files with a .lrdata extension and didn't find any.

Lightroom 3 and Adobe Camera Raw cache files

Lately in: User/Library/Caches/Adobe Camera Raw I've been getting tons of (cache0000019858.dat) " just an example of one of the many files"
Are thes related to Lightroom 3?
What are they and can they be deleted or moved to another drive?
I primarly use this computer only for Lightroom 3.
Thanks
David Morris

JS4653 wrote:
If you change this location will it move the files from the pre-existing location to the new one?
The question also applies to LR4, which si what I'm using.
If you mean does it move the files in the cache - I don't know, but I doubt it and it doesn't really matter. It will just use the new cache location, so will be a bit slower until it builds up the cache (and it might leave a load of stranded garbage in the old location, so probably a good idea to purge the cache before changing the location, or delete the old one manually).

Lightroom using Adobe Camera Raw Cache

Just noticed I have a lot of large files accumlating in C:\Documents and Settings\myusername\Local Settings\Application Data\Adobe\CameraRaw\Cache.
Is this normal? Should it clean out automatically (does not seem to be) or can the size be limited?
Appreciate any insight.
~Bob

Hi Bob,
SIze limit on the camera Raw cache file is controlled in the FIle Handling tab of the Lightroom Preferences (Lightroom|preferences). The default setting for LR 2.0 is 1 GB. BE aware that this setting is also controlled by any other Adobe application that supports Camera Raw (Photoshop CS3, Bridge, etc.). So, if it is changed to 4 GB in Bridge, it is 4 GB in LR. It is a cache used by the Camera Raw and it speeds up Camera Raw applications. When you have finished, you can purge the cache at any time by pressing the Purge Button in the same section that contains the maximum cache size.
Dave Huss

LR4 and Camera RAW Cache folder

Hi all,
I know many are complaining about LR4 responsiveness and how LR3 was faster in response.
Like many others, I have a new and very fast PC, however it seems that LR4 is crawling when it comes to navigtaing through images.
I've done my share bit of tweaking LR4 to get the best optimized results such as, Optimize catalogs, Render 1:1 previews, Increase Camera Raw cache size to 30GB, move the Camera Raw Cache folder next to the catalog folder as Adobe recommends and what not.
LR4 didn't become more responsive, however I did notice something strange, which is the topic of this post.
While filddeling around with LR4 performance issues on my PC, I've noticed that even though I have over 20,000 images in my PC and some folders are rendered with 1:1 previews, the Camera Raw Cache folder is empty.
This might explain why rendering 1:1 previews didn't affect LR4 while browsing images.
For example, right after I've created the 1:1 previews (whether it's straight from import or after the fact) I'm browsing back and forth during this browsing action, LR4 renders the 2 images each and every single time I view them - that beats the purpose of using the cache folder.
So one comes to think how could it be that with such a catalog size and 1:1 previews, the camera raw cache folder remains empty? And could this be the cause that makes LR4 render each and every single image time and time again regardless if I viewed the image a second ago?
Thanks.
Gil.

Firstly, to clarify, Previews and Camera RAW files are not the same thing. Previews are simple, just jpeg representations of the raw file, at various resolutions used principally in the Library module and filmstrip.
Camera RAW cache files are used by the Develop module and contain the output from some initial RAW processing. I don’t remember exactly what processing but about half that LR needs to do to render an image. This processing is done regardless of what you actually do in the Develop module so it is done once, then cached. This is why the “Loading” appears to take longer when you initially browse to an image in the Develop module. The rest of the RAW processing (about half) is done every single time you browse away from the image and back again. This is why you always get CPU spikes when browsing through images in the Develop module. So you can create as many 1:1 previews as you like, this will have no impact whatsoever on image rendering performance in the Develop module.
So to answer your question specifically,
Can you be more specific about when exactly does this folder being populated?
A camera raw cache file is generated when you browse to an image whilst in the Develop module. Files continue to be generated until the cache size limit is reached, then as new files are generated, the oldest are deleted.

LR 5.5 - Camera RAW Cache settings reset non-stop

Lightroom doesn’t remember the folder path in Camera RAW Cache Settings section in File Handling tab in Preferences window. I want to set my own folder Camera Raw Cache and its maximum size but every time Lightroom sets default path (C:/Users/Name/AppData/Local/Adobe/CameraRaw/Cache/) and also maximum size as 1GB. When I set all the parameters Camera RAW Cache and click OK or switch between the tabs in Lightroom preferences window or restart Lightroom and I return to the File Handling tab all the data is reset to default. The same happens when I want to change the parameters Camera RAW Cache from Adobe Bridge and Photoshop.
Second question:
When I use DNG file format with Embed Fast Load Data option in the folder Camera RAW Cache the “DAT” files doesn’t appear. Is it connected with the use of Embed Fast Load Data option? When I use the original NEF files from my Nikon “DAT” files appear.
[Win 7 64-bit, LR 5.5, Web&Design CS6]

I have no trouble placing my Camera Raw cache where I want to put it. Perhaps deleting your Preferences file would help with that problem.
Yes, if you embed fast-load data in your DNGs, LR will use that instead of the CR Cache.
Hal

QQ about Camera Raw Cache and why mine is empty

Quick question about Camera Raw Cache:
Mine is empty. Always.
I've read that the Develop module stores information on photos it opens in the Camera Raw Cache, while the Library module stores its previews in the LRDATA directory adjacent to the Lightroom Catalog. I've also read that the former can be stored anywhere and is limited to a size specified in Preferences, while the latter must accompany the Catalog file and has no cap on its size.
So why is my Camera Raw Cache always empty? I go in and out of the Develop module, edit, switch among photos within Develop, view images at 1:1 and larger within Develop, etc. Shouldn't that cause cache entries to be generated in the Camera Raw Cache? I've tried moving my Camera Raw Cache from within Preferences, and I have the size of the cache set to 30 GB with plenty of room on the drive, but it's still always empty.

Ah, yes. I shoot only JPGs. Funny how none of the documentation or tutorials mention that. The ones I've seen all imply that Lightroom uses Raw format internally when editing photos and that's why it needs a Camera Raw Cache for holding those internal files in the Develop module. I thought whenever I opened a photo in Develop, Lightroom was converting my JPGs interally to a proprietary Camera Raw format for editing them. Guess not, then.
So where does Lightroom hold all of its internal files for JPGs that I'm editing in the Develop module? Does it use the same files it generates in the Library module for 1:1 previews? (That's so different from what the tutorials say -- for example, around 11:00 on Julieanne Kost's tutorial on optimizing Lightroom, she never says she's only talking about working with Raw format.)

Curious question about Lightroom previews and Camera Raw Cache

Posted in the Flickr Lightroom Group as well:
I have noticed something about the Lightroom (3.6) previews and Camera Raw cache that have me puzzled.
I create a brand new empty catalog and purge the Camera Raw Cache.
Then I import ONE Nikon RAW (NEF) file with dimensions 2592 x 3872 (10 megapixels - 10,036,224 pixels).
Next I export that NEF file to an uncompressed 8-bit TIFF file. You would expect the size of that TIFF file to be roughly 30 megabytes (10 megapixels x 3 bytes per RGB value) and in fact the TIFF file is 30,135,830 bytes in size. If you export the same TIFF file but specify ZIP compression the resulting file size is 10,834,038 bytes. Obviously the compression obtained here is going to be highly specific to the image but so far no surprises.
During import I specify render 1:1 previews and I go into Loupe mode and view the entire image at 1:1 size. I also visit the develop module and do a bunch of manipulations on the image but no cropping.
At the conclusion of all of that I exit from Lightroom and examine the size of the Camera Raw Cache folder as well as the Lightroom previews folder. It would be my expectation that the previews folder should have a rendered full image and that the Camera Raw Cache should also have a rendered form of the raw data. What would you expect the size of those respective folders to be?
In fact - in my trials the previews folder totals a mere 1,675,264 bytes and the Camera Raw Cache which contains one DAT file corresponding to the one cached image is merely 267,374 bytes. This does not seem like nearly enough bits to preserve the rendered image nor is there a full size image tucked away in the actual catalog either - that file is not large enough to contain that. And yet I can use Loupe mode at 1:1 size and move from image to image with no loading delays (even when importing multiple files).
I'm wondering if I've missed something obvious in my analysis and if not, whether someone might care to speculate as to what magic Adobe is practicing here. Even if we grant them some special algorithm to compress their previews I don't see how they can achieve a compression so much greater than the ZIP-compressed TIFF file achieves.
And for those that might think to ask - I've repeated these experiments with multiple raw images and on both the PC and MAC platforms.
I look forward to some answers or interesting theories or perhaps someone might replicate the experiment and report findings.

MadMan and Hal - thanks so much.
So that was my D'Oh moment of what I was missing - the use of re-rendered JPGS as previews. That certainly does fit with the file sizes I am seeing. I had naively assumed that the previews might have tried to preserve the full fidelity of the image - But as you suggest that full fidelity is likely only there in the develop module.
This perhaps explains another observation from the Develop module - moving from one image to another might display "Loading" either briefly or across a longer duration. My guess is that the length of the loading process might have to do more with what is cached in RAM than cached on disk in the camera raw cache. More of a shame then that 64-bit Lightroom on 64-Bit Windows cannot grab more RAM than it seems to do at present.

Camera Raw Cache location? SSD or HDD

Where should I set up my Camera Raw Cache location? (SSD or HDD)
My System Configuration
C Drive(SSD): Windows & Lightroom software
D Drive(HDD): Image files & LR catalog file
I know SSD has fast speed but fragmentation occurs. whereas HDD speed is slow, but fragmentation does not occur.
I'd like to know set up my Camera Raw Cache location.

Where should I set up my Camera Raw Cache location? (SSD or HDD)
My System Configuration
C Drive(SSD): Windows & Lightroom software
D Drive(HDD): Image files & LR catalog file
I know SSD has fast speed but fragmentation occurs. whereas HDD speed is slow, but fragmentation does not occur.
I'd like to know set up my Camera Raw Cache location.

PS CS6 / Bridge / ACR 8.5 - Camera RAW Cache settings reset non-stop

Adobe Bridge/Photoshop doesn’t remember the folder path in Camera RAW Cache Settings in Camera RAW Preferences window. Every time when I want to set my own folder Camera Raw Cache and its maximum size, I click OK and return to Camera RAW Preferences, I see default path (C:/Users/Name/AppData/Local/Adobe/CameraRaw/Cache/) and maximum size as 1GB.
[Win 7 64-bit, LR 5.5, Web&Design CS6]

Problem is solved!
I delete folder "C:\Users\USERNAME\AppData\Roaming\Adobe\CameraRaw\". Then I start Lightroom and I pick my own folder in Camera Raw Cache Settings, set 20GB size and click OK. Now everything works fine. Bridge and PS also fine.

Can't open Camera Raw (CR2) files in Photoshop CS3?

I can't seem to open Camera Raw CR2 files in Photoshop CS3, my CameraRaw plug in version says it's 4.6 - any help appreciated.

Have you tried opening up out of Bridge? If that doesn't work you may new need to download a new driver from Canon. All my peripherals are Canon and I am always having to download new drivers everytime I update. Fortunatly they are really easy to find on Canon's site.

IPhoto '09 not importing Camera Raw (.CR2) files

Recently purchased a new Mac Pro and tried to import my Camera Raw files from a supported camera. iPhoto refuses to import (unrecognized file format) files. Does anyone know the solution? I have over 1,700 camera raw (.CR2) files I need to import.

Larry,
Cameras were Canon 20D and 50D. Until yesterday both were using the sRAW color space - switched them to Adobe RAW today. Problem was the 1,700 pictures with sRAW colorspace taken over the past few years - no issue importing into Adobe Photoshop CS4 (not surprising at it uses its own libraries), problem was only with iPhoto. I had what iPhoto reported as the latest update to Camera Raw, however when I browsed the Apple support pages I found v3.0 which I installed. That fixed the problem as it now has sRAW support for Canon cameras.
Only issue that remains is importing of DNG formatted pictures. iPhoto will not import those, which is hard to understand as it is becoming the defacto cross platform format for RAW files.
I don't recall having this issue on my older MacBook using an older version of iPhoto and older libraries...
Anyway, good news is that v3.0 fixed the problem.
Thanks.

Where do I find the Camera Raw settings file?

I've been running Creative Suite 3 on a MacBook Pro. I just bought a Mac Pro so got my disks off the shelf to install on the new machine. That's when I found I have to deactive the programmes on the laptop in order to install them on the tower. (Which strikes me as outrageously restrictive. How many people work on a tower at home and a laptop for the road?)
Having gone throught the deactivation/activation process, I opened Photoshop to process some NEF files, and then remembered that my Camera Raw settings were somewhere on the laptop - but where ??? I assume there must be a file somewhere, but have not so far been able to find it.
Any ideas gratefully received.
Thanks

Victor Burgin wrote:
I've been running Creative Suite 3 on a MacBook Pro. I just bought a Mac Pro so got my disks off the shelf to install on the new machine. That's when I found I have to deactive the programmes on the laptop in order to install them on the tower. (Which strikes me as outrageously restrictive. How many people work on a tower at home and a laptop for the road?)
Having gone throught the deactivation/activation process, I opened Photoshop to process some NEF files, and then remembered that my Camera Raw settings were somewhere on the laptop - but where ??? I assume there must be a file somewhere, but have not so far been able to find it.
Any ideas gratefully received.
Thanks
By "Camera Raw Settings file", I take it that you are looking for the develop settings for each raw file. These settings can be stored in two ways. The first and most common method is to store them as sidecar *.xmp files in the same directory as the NEFs. The other method is to store them in a centrally located Camera Raw database. One can change these methods via the Edit Preferences menu of either Photoshop or Camera Raw. Further information is here:
http://help.adobe.com/en_US/Photoshop/11.0/WSD94FB319-761D-4e9a-BC8D-24DF7EBC05B4.html
The storage location for this central database as well as the storage locations for other settings are shown in this Adobe link:
http://kb2.adobe.com/cps/405/kb405012.html

Camera Raw .CR2 file download failure from new Canon650D

I have the new model Canon650D and cannot download Camera Raw CR2 files into Photoshop Elements 10. I get a "program error" message on screen. I have tried converting to DNG files but get same error message. I have downloaded latest upgrades for Camera Raw plug-ins in Adobe Application Manager and evidently have the latest 6.7 version available. Is there a later upgrade or do I have to wait until Adobe catch up?

You have two alternatives:
(1) Upgrade to PSE 11. (2) Download and install the free Adobe DNG converter to convert your raw files to the Adobe universal Raw format and the files will open in all versions of PSE (keep your originals as backups and for use in the camera manufactures software) Try a differnt download (7.3 the latest) if DNG did not work before.
Windows download click here DNG Converter 7.3
Mac download click here DNG Converter 7.3
You can convert a whole folder of raw images in one click. See this quick video tutorial:
You Tube click here for DNG Converter tutorial

ACR 5.6 won't install (XP) ?get camera raw.8bi file to install manually

ACR 5.6 won't install on my XP 32-bit using the .exe installer.
Is there an option to get the camera raw.8bi file to install manually somnewhere? Have the Canon 7D and would like to be able to use the Adobe converter.

To accomplish a manual install on Windows you can copy and rename the file:
your-unzip-location-for-ACR56RC1\extensions\AdobeCameraRaw5.0All-121109114152\Assets\1003
to camera raw.8bi and put it in the directory previously mentioned. The clue this is the right file is that it is about the right size as the existing Camera RAW.8bi but slightly larger.
What you can't install by this procedure are all the camera-specific profiles for newly supported cameras in this version. You would probably need to install the LR 2.6 RC or maybe the DNG Converter 5.6 RC to get those. For your 7D these would be the ones beyond the Beta that ACR 5.5 had.

Camera Raw Cache Files

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