Lightroom: Picasa not able to view DNG files created in Lightroom 4

  • 8
  • Problem
  • Updated 4 years ago
  • In Progress
  • (Edited)
I appear to have a problem viewing dng files in Picasa that were converted to the dng format by Lightroom 4. Lightroom 3 files remain fine. The original file (created by Viewscan) pre Lightroom 4 conversion can be viewed in Picasa but files converted by Lightroom 4 appear as alternating dark bands and pixelated bands.
Maybe it is something else but the timing seems to correlate with the move to Lightroom 4. Has anyone else seen this effect? I use Picasa for face recognition.
CS5 can view the same dng file without issue
Photo of Stephen Cassidy

Stephen Cassidy

  • 3 Posts
  • 0 Reply Likes

Posted 7 years ago

  • 8
Photo of davenonly

davenonly

  • 1 Post
  • 0 Reply Likes
Same. Pictures are distorted.
Photo of LRuserXY

LRuserXY

  • 426 Posts
  • 41 Reply Likes
I noticed the same when exporting as DNG and then viewing in IrfanView. It seems to have something to do with the "embed fast load data". When that is turned off, the DNGs are OK.

Don't know where the error is, though (LR or IrfanView/Picasa).

Edit: Same effect when "convert to DNG" ist used: In that dialog, there is the same checkbox. If activated, the resulting DNG is distorted (bands) in IrfanView.
Photo of Dan Miller

Dan Miller

  • 1 Post
  • 0 Reply Likes
I have the same problem with the Fast Picture Viewer Codec which enables thumbnails of DNG files in Windows Explorer. Once the LR4 'Embed Fast Load Data' is unchecked, it works okay. Seems that Adobe have tweaked the DNG format in LR4 and that is causing the problem.
Photo of Tom Hogarty

Tom Hogarty, Lightroom Product Manager

  • 32 Posts
  • 37 Reply Likes
Official Response
Stephen,
We've contacted Google about this issue. It looks like more than one software vendor is not reading image files properly. The extra information from the Fast Load Data should not cause an imaging software to fail to read the file properly.

We'll reach out to other vendors as appropriate.

Regards,
Tom Hogarty
Photo of Chris Packrat

Chris Packrat

  • 30 Posts
  • 2 Reply Likes
In the absence of a DNG 1.4 specification, how to ensure "Fast Load Data should not cause an imaging software to fail to read the file properly" ;)
Photo of Stephen Cassidy

Stephen Cassidy

  • 3 Posts
  • 0 Reply Likes
The " Fast Load Data" fix by itself does not work to resolve the issue anyway.
However, selecting the image or images in Lightroom 4 and selecting Update DNG Preview & Metadata under the Metadata menu updates the thumbnail preview in Picasa and all goes back to normal.
Photo of Janet Donker

Janet Donker

  • 1 Post
  • 0 Reply Likes
is there any update on this? I too have corrupted thumbnail and full views in picassa. Is the issue with the dng encoding or with picassa?
Photo of Wayne Smith

Wayne Smith

  • 4 Posts
  • 0 Reply Likes
I am having the same problem since LR4. LR3 imports to DNG fine - that is I can use the DNG files in photomatix or any other application. Seems like this import function got broke in LR4.
Photo of Wayne Smith

Wayne Smith

  • 4 Posts
  • 0 Reply Likes
It seems like LR4 does not take time to render previews.
Photo of Wayne Smith

Wayne Smith

  • 4 Posts
  • 0 Reply Likes
I tried Stephens solution to "Update DNG Preview & Metadata" so can this be done automatically in LR4?
Photo of Stephen Cassidy

Stephen Cassidy

  • 3 Posts
  • 0 Reply Likes
Once the change is made and applied to existing images, all new images will be rendered properly
Photo of Wayne Smith

Wayne Smith

  • 4 Posts
  • 0 Reply Likes
Thanks - I'm sure this could be closed now. I downloaded LR4.1 and the problem seems to be fixed. However, I will do so more testing.
Photo of LRuserXY

LRuserXY

  • 426 Posts
  • 41 Reply Likes
The problem is still there in LR 4.1RC, at least for exported DNGs (Canon CR2 exported as DNG). The problem goes away when fast load data is *not* included (I tested using IrfanView). However, the preview image is always perfectly OK (medium in exiftool tag PreviewImage, large in exiftool tag JpgFromRaw).

So I wonder why the problem can be resolved for DNGs in the catalog by "Update DNG Preview & Metadata". Perhaps this command updates the fast load data (or removes it) based on the current settings?

EDIT: My assumption was correct. The command "Update DNG Preview & Metadata" will write or delete (!!) the fast load data based on what is configured in preferences -> file handling -> import DNG creation. Activating/deactivating that option and afterwards issuing the "Update DNG Preview & Metadata" command will make the error appear and disappear respectively. Note that the preview images (medium and large, see above) are perfectly OK in both cases (extracted using exiftool).

So the issue is _not_ solved yet in LR 4.1 RC (if there is anything to solve and neither Picasa nor IrfanView are to blame).

*EDIT2*: I noticed another oddity: Only if fast load data is embedded (and IrfanView distorts the image), exiftool outputs a warning when extracting the preview images: "Warning: Ignoring 2 SubIFD directories". The warning does not appear if fast load data is *not* embedded.
Photo of Peter Harris

Peter Harris

  • 5 Posts
  • 0 Reply Likes
Is any solution to this problem in the pipeline? I have just purchased LR4.1 and I get the problem with banding in a number of other photoviewers. I Installed the latest DNG Codec and also updated Directory Opus file browser to the latest version. This has fixed the problem in Directory Opus but Picasa still shows banded images.

Peter Harris
Photo of Peter Harris

Peter Harris

  • 5 Posts
  • 0 Reply Likes
Forget that! I have just updated Picasa to the latest version (3.9.0) and it seems to have fixed the issue

Peter
Photo of John Samuels

John Samuels

  • 1 Post
  • 0 Reply Likes
With Lightroom 4.2 and Picasa 3.9 DNG images are still not properly displayed.

John Samuels
Photo of Rob Cole

Rob Cole

  • 4831 Posts
  • 386 Reply Likes
Is this not simply a DNG format problem? - Adobe started writing DNG 1.4 files but nobody else could read them yet. Certainly I had this problem with exiftool when Lr4 was first released (it could not read Lr4-written DNGs either).

A workaround for the mean time: Use Adobe DNG Converter instead of Lightroom, and create v1.3 DNGs until the rest of the world catches up...

PS - Adobe: please update Adobe DNG Converter command line documentation. Please?
Photo of Rob Cole

Rob Cole

  • 4831 Posts
  • 386 Reply Likes
Adobe DNG Converter command-line documentation - request for update.

I don't mean to harp, but it just needs a couple lines of text, without which, some of us are high & dry - DNG-wise.

It's been months - please don't make us wait much longer...
Photo of Peter Harris

Peter Harris

  • 5 Posts
  • 0 Reply Likes
I used to have this problem but not for several months.

I am currently using Picasa 3.9.0 and LR 4.3RC.

Have you got the latest DNG codec installed I wonder?

In case it's of any help I have uploaded a DNG file I created yesterday to the following URL: (its 25 Mb)

www.gp-it.co.uk/17 Nov 2012_0012.dng

(Don't get too excited about the picture - it's just a test shot I took outside a camera shop yesterday)

Try this and see if its a conversion or a rendering issue

Peter
Photo of Peter Harris

Peter Harris

  • 5 Posts
  • 0 Reply Likes
Sorry that hyperlink hasnt come out right.

You will need to copy and paste the url into your browser

Peter
Photo of Peter Harris

Peter Harris

  • 5 Posts
  • 0 Reply Likes
Sorry - making a pigs ear of this. The link doesnt work unless I zip it so I have uploaded again to

www.gp-it.co.uk/testdng.zip

Peter
Photo of Parafly

Parafly

  • 5 Posts
  • 0 Reply Likes
has this been fixed? seems like DNG's are now showing up for me.
Photo of Chris Cox

Chris Cox

  • 20280 Posts
  • 837 Reply Likes
Did you update Picasa to pick up the bug fixes?
Photo of Nicholas Clifford

Nicholas Clifford

  • 5 Posts
  • 0 Reply Likes
I'm running Photoshop CS 5 under Win 7, and though it will not read the NEF files produced by my new camera (Nikon 7100), using Adobe's file converter means that the .dng files can be read by Photoshop. A nuisance, but no worse than that. However, the new .dng files cannot be read by Picasa 3.9.140 (the latest version, I'm told), despite Picasa's claims that it can. I've been into Tools/Options/File types, and the RAW box remains checked; the Nikon 7100 is listed there as one of the cameras supported but apparently it isn't.