28
votes
Accepted
How can I extract just the value of a tag without the name using exiftool?
From the man page:
-s (-short)
Short output format. Prints tag names instead of descriptions.
Add up to 3 -s options for even shorter formats:
-s - print tag ...
- 140k
25
votes
Level adjusting images to hide internal features/detailing
A well know technique is called "luminosity masks". You create a selection mask where the pixels selection level is:
100% or near 100% in the luminosity range that you want to change,
0% or very low ...
- 16.3k
24
votes
Accepted
Extract reflections from photo in Photoshop for use later?
Simply select and copy the screen/glare you want to overlay, and paste it to a new layer. Set the Blending Mode to Hard Light. Then paste in your product image in a new layer and place it underneath ...
- 17.6k
24
votes
Accepted
What type of postprocessing gives the effect of people standing out against a flat-seeming background?
I'd guess it's as simple as selecting the subject in Photoshop - with a tad more care & attention than I've used below, then leeching out the saturation in the background & tonally balancing ...
- 19.7k
21
votes
Accepted
What algorithm can I use to simulate bokeh?
I think the main problem is one of dynamic range, your algorithm is probably right but you're working on the wrong type of data.
A point light source that would otherwise clip and go pure white gets ...
- 117k
20
votes
Accepted
How can I turn off Lightroom's backup notice?
Lightroom always uses a catalog to store your edits, however you can disable the backup notifications.
Go to: Edit->Catalog Settings (PC) OR Lightroom->Catalog Settings (Mac)
Set: "Back up catalog" ...
- 1,118
20
votes
Is a JPG guaranteed to produce the same pixels?
Short Answer
No, decoding is not guaranteed to always be the same. However, the differences are guaranteed to be very, very small.
ISO Specifications
The International Organization for ...
- 301
14
votes
Can the Nik Collection be used without Photoshop or Lightroom?
Yes they can, but there are some significant caveats. Although they can be run alone, the plugins were not designed to be used as a standalone application.
If you have the folder with the executable ...
- 168k
14
votes
Accepted
Can a blind person resize a photo independently?
The image I uploaded was rejected because it was under 300 DPI.
The DPI is just a number which has no relevance to a digital image. It relates only to printing and not the quality or resolution of ...
- 6,265
13
votes
Accepted
What can you do with Lightroom catalog files if Adobe stops support for Lightroom?
I think you'll be fine. Look at the case of Aperture, discontinued by Apple. Adobe offers an Aperture import plug-in.
Lightroom's catalog is an SQLite database and much of the data stored within it ...
- 458
12
votes
What algorithm can I use to simulate bokeh?
First of all, in optics, only light adds up and darkness does not. Make sure that your algorithm does not bleed dark pixels outwards their original location. Resulting pixels should rather resemble ...
- 31.1k
11
votes
Accepted
Why I am getting only solid yellow images from Adobe Camera Raw?
The display corruption could be a consequence of using GPU acceleration in the ACR module. Not all cards are supported, so try toggling off the option.
Also make sure that option is off in Photoshop.
- 32.4k
11
votes
Is there software other than Lightroom that offers local Laplacian filters? (Or similar.)
This processing is implemented in darktable via the Local contrast module as explained here. The interface probably isn't as sophisticated as you might like, but may be an improvement on software that ...
- 5,244
10
votes
What software can show my most frequently used focal length?
Assuming that:
The focal length has been recorded in the file metadata
You are running a Unix-like OS such as Linux or OS X (or Cygwin in Windows)
You have installed the exif command line tool
Run ...
- 233
10
votes
Level adjusting images to hide internal features/detailing
I'll interpret your question in the opposite way everyone else has. You seem to me to be asking how to prevent the details becoming visible again. Once you have darkened your image, increase the black ...
- 201
9
votes
How can I extract just the value of a tag without the name using exiftool?
Use -b:
$ exiftool -b -make x.jpg
From the man page:
-b (-binary)
Output requested metadata in binary format without tag names or descriptions.
This option is mainly used for extracting ...
- 363
9
votes
Is a JPG guaranteed to produce the same pixels?
No, you can't depend on decoded JPEG images being bit-for-bit identical.
As an example, I tried viewing the image at the top of this page in two different browsers: Chrome 53.0.2785.143 and Internet ...
- 1,393
8
votes
Linux software for stacking and RAW processing
Here is the process I use:
cd ~/directory_with_raw_files
ufraw-batch --out-type=tif --out-depth=8 --wb=camera --exposure=0.33 --black-point=auto *.NEF
Of course, you will process CR2 files instead ...
- 712
8
votes
What can you do with Lightroom catalog files if Adobe stops support for Lightroom?
If Adobe stops support for Lightroom, you use your catalogs just as you did before. You don't need Adobe's support to use the software, especially if you have a perpetual license. But even if not, the ...
- 6,770
8
votes
How to migrate from Picasa to Lightroom?
Non-destructive Edit History
The bad news is that the non-destructive edit history is not something that can easily be moved between Picasa and any other photo processor. Sorry, you just won't be ...
- 45.7k
8
votes
How to migrate from Picasa to Lightroom?
I wrote a Lightroom plugin for migrating from Picasa to Lightroom. I searched all over the web and could not find a good solution, so I wrote one myself. I decided to polish it up and offer it for ...
- 81
8
votes
If EXIF metadata is removed, can I find the software or camera used in any other way?
JPEGsnoop compares the compression signature in a JPEG with its database of known combinations of signatures and software/firmware, and gives a list of software/cameras that match the signature of the ...
- 8,929
8
votes
Accepted
Remove lightroom from second monitor
The Dual Monitor mode is activated by the Second Window button.
To close the second window just click this button again.
More on Adobe help page.
- 1,749
8
votes
Are there image stacking (astrophotography) options on MacOS that don't involve running a Windows VM?
There are possibly several options available. From a cursory search, native Mac applications include:
Nebulosity
Keith's Image Stacker
PixInsight (cross-platform)
Starry Landscape Stacker
If none of ...
- 31k
8
votes
Accepted
Opening NEF files on windows initially open fine but then change contrast
Anytime you open a raw file and look at it on your screen, you are not viewing "THE raw file." ¹ You are viewing one among a near-countless number of possible interpretations of the data in ...
- 168k
8
votes
Terminology for camera focus values
Photographers don't care about the 0 to 255 values, they care about the actual focal distance of the lens in real world units (i.e. metres in the vast majority of cases). If you are creating a product ...
- 19.8k
7
votes
Accepted
Is there a Windows panorama stitching package that can stitch RAW files?
Stitching RAW files is problematic. In order to get a good stitch you ideally want to correct vignetting and distortion first, something that you would do in your RAW converter, then just output TIFFs ...
- 501
7
votes
Accepted
What do lens distortion data values a, b and c actually mean?
from http://wiki.panotools.org/Lens_correction_model
The actual lens correction parameters a, b and c which are used to correct for barrel distortion, pincushion distortion and even wavy distortion.
...
- 4,845
7
votes
How to automate a camera to take two pictures every hour for 24 hours, with each picture spaced apart by 15 seconds?
Easy. Use any Canon camera supported by magic lantern. Load it onto the card (plenty of tutorials online, all you have to do is copy some files onto the SD card and run a firmware update on the camera)...
- 871
Only top scored, non community-wiki answers of a minimum length are eligible