Curious question about previews of Lightroom and Camera Raw Cache

Posted in the Flickr Lightroom group as well:

I noticed something on the previews of Lightroom (3.6) and cache Camera Raw, intrigued me.

I create a new, empty catalog, and purge the Cache of Camera Raw.

Then I import ONE Nikon (NEF) RAW file with dimensions 2592 x 3872 (10 mega pixels - 10,036,224).

Then I export this NEF file to a TIFF 8-bit file uncompressed. You can expect this file size TIFF about 30 MB (10 megapixels x 3 bytes per RGB value) and in fact the TIFF file is size of 30,135,830 bytes. If you export the TIFF file same ZIP compression to specify the size of the resulting file is 10,834,038 bytes. The compression achieved here is obviously going to be highly specific to the image, but so far no surprises.

When you import I said make 1:1 previews and I spend in the Loupe and see the whole picture in the format 1:1. I also visit the development module and do a lot of manipulation on the image but not cropping.

At the conclusion of all this, I got out of Lightroom and examine file camera Raw Cache as well as previews of Lightroom file size. It would be my expectation that the previews folder should have a complete image rendering and Camera Raw Cache should also have a display form of raw data. What do you expect the size of these respective folders to be?

Indeed - in my tests that the previews folder totals a simple 1 675 264 bytes and Camera Raw Cache that contains an image DAT file cached one is simply 267 374 bytes. This doesn't seem like enough bits to preserve the image rendered, nor there at - it an image is full-size, nestled in the actual catalog - the file is not large enough to hold that. And yet I can use the magnifying glass to the format 1:1 mode and move an image to the image without loading delays (even when you import multiple files).

I wonder if I missed something obvious in my analysis and that, if someone might not care to speculate on what magic Adobe's practice here. Even if grant us them special algorithms to compress their insights that I don't see how they can achieve a compression so much larger than the file ZIP compressed TIFF realizes.

And for those who might think to ask - I have told these experiences with multiple raw images and on MAC or PC platforms.

I look forward to answers or interesting theories or maybe someone could reproduce the results of the experiment and report.

The previews in the preview cache are JPEG files. JPEG compression is much more effective than the lossless zip compression. No magic here.

Mr. Chan is obviously the expert on regards to the Camera Raw Cache.

HAL

Tags: Photoshop Lightroom

Similar Questions

  • Problem with Lightroom and Camera Raw

    I can't really make any sense out of Camera raw and other adobe products.

    I have Lightroom 2.4, and if I click on the option 'a way', I said I have camera raw 5.4. However, I have no installed DCP files and therefore no options of calibration of the camera. All I see is "incorporated".

    Are also installed in Photoshop Elements 7 (Camera Raw 4.5.0.175), first Elements 7 & Photoshop CS3 (Camera Raw 4.0).

    I'm not an expert in the present, and I find the instructions on the site of adobe completely confused and hopeless.

    I if advance is no reference to how to get a CR to my Lightroom update. I found 4.6 for CS3 that I understand I SLES later, but I just can't find how to get the camera profiles installed from an update.  If anyone can help.

    Thank you

    Colin

    There is no Camera Raw to Lightroom update!  Lightroom does not use plug in Camera Raw.  All these features are part of the Lightroom program.  The profiles should be installed when you installed Lightroom 2.4.  When you see "Embedded", which indicates that you are working on a JPEG image.  You work on a raw image in order to see other profiles for your camera.

    What device do you have? Some devices did not have a lot of different profiles.  When you open a raw image in Lightroom, you are able to see the different profiles?

  • The difficulty to upgrade my CS5, bridge, Lightroom and Camera RAW.

    I get an error saying that I not eligible to license. I have all my licenses and that they are in my adobe products, have all my boxes of product, but I still get errors.

    Please try to update the product manually, here is the link to download the updates

  • The cheapest "Creative cloud photography Plan" includes it Bridge and Camera Raw?

    Hi people, I have used creative cloud four years now, only to use Photoshop for my work. I pay £17.58 per month (UK), but it seems to me that I could actually pay half, AND get included Lightroom (I'm on a subscription "an application" from now)... the problem is, I can't seem to find all the information about knowing if Bridge and Camera Raw would be included in the "Plan of photography" - they are essential for my work , so can not risk changing room for this plan, unless I know for sure. If anyone has the answer, it would be great. And if this is the case, can I also get 4 years of repayments, as I feel a little like I'm torn right now!

    Hi monkdave,

    There is a special plan designed for photographers, called "photography Plan" that includes Adobe Photoshop CC 2015, Lightroom CC 2015, CC 2015 and Camera Raw bridge.

    I think that the plan that you have right now is called "Only one App membership only for Photoshop" and this plan includes cloud storage space more (20 GB) relatively in terms of photography.

    Reference: Lightroom and Photoshop | Plan of creative photography of cloud of Adobe

    Kind regards

    Mohit

  • I just updated my Bridge and Photoshop and camera raw is now my images appear dull?

    As it is said above. My NEF (RAW) Preview on the left look great but a little as I open them in camera raw (right) to edit it alleviates instantly. It was fine before, before I did the update. Any ideas?

    Screen Shot 2015-07-09 at 1.42.26 PM.png

    Since you didn't say what specific versions and what specific model of Nikon camera, it's just a guess: you have a D810 and updated to 2015 CC with cab 9.1 and your camera profile that said Adobe Standard now says flat camera.

    The problem is that somehow versions.1 are ignores Adobe Standard profile and go to the next in the list that is flat camera.

    The temporary solution until Adobe gives us a version.2 that works, once again, is to download and install the Adobe D810 Standard profile in the common area of the users profile.  Here is an Adobe help page on this topic:

    Adobe Photoshop Lightroom Help | Display pictures of Nikon D810 with different colors in Lightroom and Camera Raw 9.1 6.1

  • Question about license Photoshop Lightroom 6

    Hello

    I want to buy Photoshop Lightroom 6 (not subscribing to CC) and I have two questions:

    1. Can I install this program (not seen that a single permit for me as user) on my main computer and my wife's cell phone (even if it's his computer, only I'll be the user of the software)? I found somewhere in the questions that yes I install Lightroom on both computers unless I am the only user of the program, but then I found that in the EULA and he kept of wondering if I understand though.
    2. If I buy the "Lightroom 6", do all the updates from Lightroom 6? For example, I buy today and I get the most recent version available, for example Lightroom 6.4... and what happens if in a certain period of time, the 6.5 version comes out? I get this update too? I'm not situation that Lightroom 7 came out which is obvious to me that you buy a new product update.

    Thank you very much for your help.

    Kind regards

    Marcin

    Marcin salvation,

    1. Can I install this program (not seen that a single permit for me as user) on my main computer and my wife's cell phone (even if it's his computer, only I'll be the user of the software)? I found somewhere in the questions that yes I install Lightroom on both computers unless I am the only user of the program, but then I found that in the EULA and he kept of wondering if I understand though.

    Yes you can install it on two computers. Be sure to buy the license for several Platforms.Refer frequently asked questions about using Photoshop Lightroom with creative cloud

    If I buy the "Lightroom 6", do all the updates from Lightroom 6? For example, I buy today and I get the most recent version available, for example Lightroom 6.4... and what happens if in a certain period of time, the 6.5 version comes out? I get this update too? I'm not situation that Lightroom 7 came out which is obvious to me that you buy a new product update.

    Yes, you will get the last continues version.and will get updates on this topic. (Future update releases 6.5,6.6 and so on). You may see Lightroom FAQ (frequently asked Questions)

    Kind regards

    Assani

  • With the bundle Photoshop and Lightroom, Bridge and Camera Raw comes with it?

    With the bundle Photoshop and Lightroom, Bridge and Camera Raw comes with it?

    Hello

    Yes, Camera Raw and Bridge are included. Bridge will have a separate installation, however.

    Kind regards

    Steve

  • QQ on Camera Raw Cache and why mine is empty

    Small question about Camera Raw Cache:

    Mine is empty. Always.

    I read that the develop module stores information about the pictures, it opens in the Camera Raw Cache, while the library module stores its previews in the adjacent LRDATA directory to the Lightroom Catalog. I also read that the first can be stored anywhere and are limited to a size specified in preferences, whereas the latter must accompany the catalog file and has no limit on its size.

    Why so my Cache Raw camera always empty? I'm going in and out of the develop module, edit, switch between photos to develop, see 1:1 and larger images to breast to develop, etc. Should not that cause the cache to be generated in Camera Raw Cache entries? I tried to move my Camera Raw Cache of preferences and I the size of the cache the value 30 GB with plenty of space on the disk, but it is always empty.

    The Camera Raw cache entries consist of a few early demosaiced and partially processed data which gives a head start when loading the image in the develop module. But ultimately, it is the original and complete file that is finally loaded once the raw conversion and a modifiable built and displayed real-time preview. This happens whenever you load a picture to develop. A Jpeg file is little different in the way it is loaded, i.e. the complete original of the file is read each time and the real-time preview generated, except that as there is no raw conversion to do it are obviously didn't need at this time for this entry cache to exist. There is no file of 'internal' which was held to facilitate the process of development, the LRDATA extracts are mainly for use in the library only.

  • Photoshop and Camera Raw or not with editing Sony RAW files?

    I still read a lot of comments and forums that Photoshop and Camera RAW are not good to convert and edit files Sony RAW (ARW). Is there a reason for this? Or is it just not biased opinions?

    I received recommendations for another program that is supposed to do a better job than the two, but still hesitant to use, I like to use what I already know...

    So, what's your response to that?

    TIA

    Hi rfe777,

    The Applications CC with Lightroom and Photoshop CC are good software to work with Sony's RAW files.

    And also, they provide a good result when working in Camera Raw.

    Kind regards

    Tanuj

  • Photoshop CS6 and Camera Raw

    I just bought a Canon 5 d Mark IV but the rough version of the camera on my PC (version 7) does not read the files. I went to help and updates, then it sys it comes to the current version. Then, I went to the Adobe site and downloaded Camera Raw 9.1.1 installer but it did not update on photoshop.  Any ideas how I intall this version of camera raw? Any help would be appreciated

    Camera Raw 9.7 is necessary to have support for this model of camera raw files. And camera raw 9.7 is not compatible with Photoshop CS6. If you have decided to stay with this version of Photoshop then your the cheaper option would be to download converter DNG 9.7 and create copies of your raw images that will open in Camera Raw DNG 9.1.1. What has happened that lead you to believe that Camera Raw 9.1.1 has not installed? If you go to help-> on plug-ins and choose Camera Raw, what version?

  • Adobe Bridge and Camera Raw too small on Microsoft Surface PRo 4

    I have the Microsoft Surface Pro 4. I downloaded Photoshop for use with fotography.

    Photoshop works perfectly, but Adobe Bridge and Camera Raw are too small. I can't read the letters...

    Anyone know a solution?

    Schermopname (4).png

    Hi all

    We published a new version of Adobe Bridge (CC 2015) on July 19, 2016. This update is available via the Adobe Creative Cloud application.

    We have approached some unwanted highDPI on Windows. Please try the new version and look for problems you encounter.

    If you are not able to locate the bridge (CC 2015) on the creative cloud application, you will need to update the creative cloud application and restart your computer.

    Thank you

    Deepak Gupta

  • I have photoshop cs5 extended and it won't let me update device central cs5, cs5 64-bit and camera raw

    I have photoshop cs5 extended and it won't let me update device central cs5, cs5 64-bit and camera raw

    update by downloading the files directly and then apply them: http://www.adobe.com/downloads/updates/

  • I have redownloaded my CS5 Photoshop and Camera Raw will not accept my RAW files or Adobe Bridge displays the display of the image of these files. A message appears saying: it does not support this camera.  I have a Nikon 5100 digital SLR.  He has always

    I have redownloaded my CS5 Photoshop and Camera Raw will not accept my RAW files or Adobe Bridge displays the display of the image of these files. A message appears saying: it does not support this camera.  I have a Nikon 5100 digital SLR.  He has always displayed them in the past.  How do I get to view these photos in Bridge, then open them in RAW?

    Your Nikon 5100 requires a minimum of 6.4 ACR.

    The ACR, which is installed with CS5 default is 6.0.

    You must update your ACR to the latest version available for CS5 - ACR 6.7

  • I have re-uploaded my Photoshop recently and Adobe Bridge no longer displays my Nikon NEF files and Camera Raw will not open them.

    I have re-uploaded my Photoshop recently and Adobe Bridge no longer displays my Nikon NEF files and Camera Raw will not open them.  I get a message saying that Camera Raw does not support my type of camera, but it has always in the past.  The bridge will no longer display the display of the image of my NEF files.  Here's of Nikon NEF files from the DSLR camera from Nikon 5100 digital.  How can I fix it?

    I have re-uploaded my Photoshop recently and Adobe Bridge no longer displays my Nikon NEF files and Camera Raw will not open them.  I get a message saying that Camera Raw does not support my type of camera, but it has always in the past.

    When you re-installed Photoshop, you also re-installed the version of Camera Raw comes with Photoshop - in other words came back you to an old version of Camera Raw, which does not support the D5100.

    Camera Raw plugin | Supported devices

    The D5100 has first supported in Camera Raw version 6.4.

    In Photoshop, click Help > updates to update Camera Raw.

  • Preferences in Bridge and Camera RAW does not

    I'll put up a new Macbook Pro, end 2013 15 ", 10.9.2

    CS6 Production Premium, also have Indesign CS6, LR5, Acrobat Pro 11. Camera RAW is version 8.4. Everything is up-to-date.

    Bridge and Camera RAW preferences do not work properly. Bridge prefs-related bridge display, for example theme color, text under tiles, places preferred, etc... all work fine. Pref. Bridge opens and closes correctly without error. "Double click on edits Camera RAW settings in Bridge" does not. Photoshop starts to open Camera RAW regardless of whether or not this box is checked. The camera RAW preferences are not open. By selecting "Camera RAW préférences" of the bridge does nothing. Camera RAW seems to work fine hosted by Photoshop.

    I tried a new user with the same results.

    What's up with that? Anyone else seeing this? Solution?

    -David

    Fixed it with this work around

    Camera Raw 8.4 | No metadata or edit Camera Raw

Maybe you are looking for