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Photoshop Lightroom

About file formats

Lightroom support the following file formats.

Camera raw formats

Camera raw file formats contain unprocessed data from a digital camera’s sensor. Most camera manufacturers save image data in a proprietary camera format. Lightroom reads the data from most cameras and processes it into a full color photo. You use the controls in the Develop module to process and interpret the raw image data for your photo.

For a list of supported cameras and camera raw formats, see www.adobe.com/go/learn_ps_cameraraw.

Digital Negative format (DNG)

The Digital Negative (DNG) is a publicly available archival format for raw files generated by digital cameras. By addressing the lack of an open standard for the raw files created by individual camera models, DNG helps ensure that photographers will be able to access their files in the future. You can convert proprietary raw files to DNG from within Lightroom. For more information about the Digital Negative (DNG) file format, visit www.adobe.com/dng. You’ll find comprehensive information and a link to a user forum.

TIFF format

Tagged-Image File Format (TIFF, TIF) is used to exchange files between applications and computer platforms. TIFF is a flexible bitmap image format supported by virtually all paint, image-editing, and page-layout applications. Also, virtually all desktop scanners can produce TIFF images. Lightroom supports large documents saved in TIFF format (up to 100 million pixels with pixel dimensions of no more than 10,000 on a side). However, most other applications, including older versions of Photoshop (pre-Photoshop CS), do not support documents with file sizes greater than 2 GB.

The TIFF format provides greater compression and industry compatibility than Photoshop format (PSD), and is the recommended format for exchanging files between Lightroom and Photoshop. In Lightroom, you can export TIFF image files with a bit depth of 8 bits or 16 bits per channel.

JPEG format

Joint Photographic Experts Group (JPEG) format is commonly used to display photographs and other continuous-tone images in web photo galleries, slideshows, presentations, and other online services. JPEG retains all color information in an RGB image but compresses file size by selectively discarding data. A JPEG image is automatically decompressed when opened. In most cases, the Best Quality setting produces a result indistinguishable from the original.

Photoshop format (PSD)

Photoshop format (PSD) is the standard Photoshop file format. To import and work with a multi-layered PSD file in Lightroom, the file must have been saved in Photoshop with the Maximize PSD and PSB File Compatibility preference turned on. You’ll find the option in the Photoshop file handling preferences. Lightroom saves PSD files with a bit depth or 8 bits or 16 bits per channel.


Comments


David Harper said on Feb 23, 2007 at 8:25 PM :
Does Lightroom not support Ilustrator files (.ai)? They don't seem to be importable.
No screen name said on Mar 15, 2007 at 10:50 AM :
No, Illustrator files are not supported.
No screen name said on Apr 4, 2007 at 1:06 PM :
Apparently Lightroom does not support cmyk files. I guess that's ok, but if I select an rgb file to import, it will not import the rgb file if there is a cmyk file in the same folder! Why is that?

Also, speaking of importing, regardless of having set my preferences correctly, when I import files that I've tagged in Bridge, none of the metadata or keywords are imported into Lightroom. I have to start all over. Why is that? I've even run the Import Keywords utility and I get nothing.

One more comment: I would love to have Lightroom "stack" my CR2, Tiff and Jpeg versions of the same image. Wish you'd make that change so I can move those three as though they were one...deleting one would delete them all, etc. If Lightroom is all about editing and I come across a blurry image I want to delete, I now have to go find all the other versions manually. There should be a way to "link" or stack file versions of the same image. Plus, having three of everything visible is messy.

While I've got you, I also think I should be able to select a group of images in Lightroom and click a "burn" button to make a CD or DVD. Outputting to proof sheets and websites is great, but why can't I make a disc in LR as well?

Thanks,
Grant
No screen name said on Apr 28, 2007 at 3:29 PM :
I typically shoot both JPEG and RAW formats simultaneously. However, no matter what I seem to do upon import, Lightroom only imports the RAW format photos, not the JPEGs. When I have gone back and tried to select just the JPEG frames a second time for import, I get an error message telling me that the given JPEG images are already in Lightroom and cannot be imported twice, yet they are not there to pull up for review or processing. Am I doing something wrong, or can Lightroom only import one type of image format from a given folder. NOTE: in folders where I have only shot JPEGs, Lightroom has no problem importing JPEG image files: the problem only occurs when each image appears in a given folder in both formats simultaneously. Also, I unchecked "ignore suspected duplicates" to no avail.
No screen name said on Jul 18, 2007 at 4:39 PM :
Note that LightRoom reports "RAW" as the type of DNG files if they were converted from RAW to DNG on import, but "DNG" if the conversion was done afterwards, even if the conversion is the same (i.e. RAW mosaiced data was conserved In both cases).

It seems the only way to detect DNG linear files from mosaiced ones is from their filesizes (about 3 times that of the mosaiced equivalent DNG).
Anita Dennis said on Jul 27, 2007 at 12:12 PM :
For more about linear vs. mosaic DNG files, read the “Convert to DNG” page: http://livedocs.adobe.com/en_US/Lightroom/1.0/help.html?content=WS0700C48D-7ACD-4639-9825-CCB6A22C0056.html.

Additional information is also available in this excerpt from Martin Evening’s update to “The Adobe Photoshop Lightroom Book” (Adobe Press): http://lightroom-news.com/lightroom-11-update/preferences/.
Anita Dennis said on Aug 1, 2007 at 12:07 PM :
In Photoshop Lightroom 1.1, you can set the preferences to allow JPEG photos with the same name as raw files to be imported as separate photos. To enable this preference, choose Lightroom > Preferences > Import (Mac OS) or Edit > Preferences > Import (Windows). Select "Treat JPEG files next to raw files as separate photos."
No screen name said on Aug 5, 2007 at 7:19 AM :
I tried to import Canon EOS5D raw file into lightroom 1.1 and I have this
strange comment that the files are not imported due to the following reason:
"The file contains unsupported color mode". This is strange since it is a
standard CR2 file and the preview can display the thumbnail.
Anita Dennis said on Aug 6, 2007 at 11:22 AM :
Lightroom 1.1 may be unable to see or import raw files directly from attached Canon cameras on Windows XP. Please visit Canon's technical support website for information on this known driver issue or use a dedicated card reader to import files captured with Canon cameras.
WWPIII said on Nov 17, 2007 at 3:54 PM :
When you choose to edit a file in Photoshop as a PSD and subsequently create a multi-layered file then choose SAVE to return the file to Lightroom, is the multi-layered file preserved? If you later decide to do additional edits in Photoshop, I do not see the multiple layers retained. Is there a way to do so?
Anita Dennis said on Nov 19, 2007 at 8:57 AM :
No, Lightroom does not support layered Photoshop files.
WWPIII said on Nov 20, 2007 at 7:34 PM :
I would like to see Photoshop Lightroom allow the storage of Layered files even if development is not allowed in Lightroom while layered. The photographer, in the workflow, first Developes the image in Lightroom and then edits in Photoshop. Rarely does the image in progress reach completion on the initial trip to Photoshop. So now I cannot send it back to Lightroom or it will be flattened. I must do a SAVE AS to a different location defeating some of the usefulness of a truly superior organizational tool. Then once I have created a Master file , I must import the file which generally ends up in a different location from the original raw or dng file. It would be wonderful to keep a work in progress in the stack where it is easy to find.

 

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