9
votes
Synology app reduces DNG file size
Conversion of iPhone Images to jpg is a "feature" of Synology's DS Photo app.
Per the DS Photo page
To ensure optimal compatibility with Photo Station, DS photo will convert photos in HEIC ...
- 4,966
9
votes
Synology app reduces DNG file size
Does this imply that during the backup the contens of the DNG file have been converted from a TIFF format to 8-bits JPEG?
Yes. Personally at this point, I would regard the Synology system as not fit ...
- 22.2k
8
votes
Accepted
Is there a way to change the aspect ratio of a DNG file?
The DNG spec contains a tag DefaultScale:
DefaultScale is required for cameras with non-square pixels. It specifies the default scale factors for each direction ...
- 144k
8
votes
Is it possible to convert M-RAW or S-RAW to RAW after shooting?
Once you discard information before saving a file you can not later retrieve it.
M-Raw and S-Raw files are lower resolution versions of the raw file created by the information produced by the digital ...
- 176k
4
votes
How can I interpolate each color individually (i.e. export an image just with Red Color) using dcraw?
dcraw can't do this directly, but it can do something which will get you pretty close: render each pixel as a grayscale, either with unscaled pixel values with -D ...
- 144k
4
votes
Accepted
How do I find out whether TIF images have gamma correction or not?
When you view the image with a normal image viewer, is it mostly dark? If not, a gamma curve has been applied. That is, does it look like this?
That's what you'll get with a pure dump of linear ...
- 144k
4
votes
Accepted
Wrong DNG colors but correct JPG. How can I "transfer" correct colors to the DNG?
RAW files are supposed to be edited and color corrected, that's their purpose - it is a digital negative (dng). When you make it positive you have control on how it becomes positive image that we see. ...
- 424
4
votes
Is there a way to change the aspect ratio of a DNG file?
I got a DNG image from iOS. I ran exiftool on it like this:
exiftool -DefaultScale="4.0 3.0" IMG_9270.dng
When opened in OS X's Lightroom or Photoshop it is de-...
- 41
3
votes
Copy DNG/XMP metadata
With exiftool:
exiftool -TagsFromFile srcimage.jpg targetimage.jpg
But your big problem will be to create the correspondence between the old scans and the new. Or ...
- 22k
3
votes
Accepted
Sharing Lightroom images in DNG with ability to undo/redo edits in another application?
Are there any applications other than Lightroom in which I can undo/redo Lightroom edits if I already have the DNG?
No. Each raw processing application is proprietary. Each application uses different ...
- 176k
3
votes
Sharing Lightroom images in DNG with ability to undo/redo edits in another application?
Only Lightroom and Photoshop (specifically the ACR engine they share) are able to understand the proprietary edit information, whether it be embedded in the DNG or a sidecar XML file.
In fact, it's ...
- 7,209
3
votes
Why doesn't Adobe DNG converter recognize files from my new camera?
What you need to do is to upgrade your version of Adobe DNG Convertor. The reason is camera vendors make slight changes in RAW formats of (almost) every new camera they release. And Adobe every ...
- 12.5k
3
votes
Accepted
How and why does VueScan's TIFF and DNG output differ?
The image pixel data contained in raw TIFF and DNG files produced by VueScan is identical. This can be proved by extracting and comparing that data. This can be done using Linux ...
- 403
3
votes
RAW (.dng) on my Phone (OnePlus 5) vs on Picasa 3 (Noisy)
Picasa is automatically applying exposure correction to your very dark image. Since this scene is intentionally very dark, this automatic is going wrong. It brightens the image up considerably, ...
- 7,209
3
votes
How can I interpolate each color individually (i.e. export an image just with Red Color) using dcraw?
I don't know of any raw converter (dcraw, ufraw, etc.) that will do this for you. But, if you have ImageMagick installed, you ...
- 5,158
3
votes
Are RAW files from iPhone different to ones from Android?
ProRAW is not ProRes. ProRes is a movie format. ProRAW is a stills format encapsulated in DNG - https://support.apple.com/en-gb/HT211965 - I can't find a full published spec from Apple, just consumer ...
- 23.4k
3
votes
how to preserve original illumination
There are problems with preserving what you've seen with camera.
All digital cameras have different metamerism than human eye. If lighting is significantly different from daylight (and/or the subject ...
- 5,553
2
votes
Accepted
How to strip iPhone DNGs of preview JPEGs?
So, good news and bad news. Good news is that you can replace the embedded JPEG with ExifTool (as shown in Can I embed existing JPEG's into DNG's as a preview?). Or, you can use ...
- 144k
2
votes
What demosaic algorithm is best for DNG to B&W conversion?
I figure that at some point someone has devised a demosaic algorithm that is optimal for converting a Bayer DNG to a B&W photograph.
Well "optimal" is in the eye of the beholder.
Your idea of an ...
- 6,404
2
votes
How can I batch-compress DNG files in my Lightroom library?
The Lightroom Queen explains how to make Lightroom apply lossy or lossless DNG compression to raw files (including DNGs) that are in your photo library:
Select the images. (This means LR can only do ...
- 153
2
votes
RAW (.dng) on my Phone (OnePlus 5) vs on Picasa 3 (Noisy)
Any time you view a "raw" image on any device, one of two things is happenning:
The raw data in the file is being processed and interpreted by the application you are using to view the image. That ...
- 176k
2
votes
Accepted
Synology app reduces DNG file size
Use Synology's DS File app instead of DS Photo to backup photos from iPhone to (Synology) NAS.
DS Photo does an unconditional and implicit conversion to jpeg. HEIC pictures are converted to jpeg. The ...
- 304
2
votes
Accepted
Is there a way to work both with DNG's and XMP sidecar files?
I hope you are aware of all the disadvantages of lossy DNG conversion. The instrument you need is exiftool. With the command below
...
- 12.5k
1
vote
Copy DNG/XMP metadata
This is already quite old, but maybe still useful for someone who finds it:
Most pragmatic solution i found for transferring edits from DNG to another DNG or the original proprietary RAWs (CR3, NEF, .....
- 11
1
vote
Which DNG version is supported by Lightroom 5.7.1?
Camera Raw 7.1 and later: The DNG file will be readable by Camera Raw 7.1 (Photoshop CS6) and later, and Lightroom 4.1 and later. The DNG file will often be readable by earlier versions, depending on ...
- 7,209
1
vote
Directly editing raw data in a DNG file prior to development
As far as I know, there is no publicly available program for blending sensor data of two shots before demosaicing and rastering it as a viewable picture.
While I could image this to be valuable in ...
- 5,422
1
vote
Edit RAW DNG data without demosaic
As user Please Read My Profile demonstrates in his answer to What does an unprocessed RAW file look like?, DCRaw and many of the raw conversion applications which draw upon DCRaw under their hoods are ...
- 176k
1
vote
Edit RAW DNG data without demosaic
The RAW data is the RAW data. You do not save changes to the raw file.
I.E. You can not alter the data within the RAW file/container itself.
If you use software to edit the RAW data you then save ...
- 3,628
1
vote
conversion from RAW to DNG (Adobe RAW) leads to unwanted crop
I took a look at your raw files. It seems there is extra data from the Sony sensor that is present in the ARW and DNG files but which is not designed to be part of the standard image size (6000x4000 ...
- 538
1
vote
How do I find out whether TIF images have gamma correction or not?
Gamma is not something that has to be "corrected" It's a scaling to accommodate 8 bit images to adjust the values represented by those 8 bits over a larger dynamic range. A RAW file contains the ...
- 1,217
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