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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
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 ...
user avatar
  • 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 ...
user avatar
  • 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" ...
user avatar
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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
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 ...
user avatar
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 ...
user avatar
  • 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.
user avatar
  • 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 ...
user avatar
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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
  • 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.
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
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. ...
user avatar
  • 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)...
user avatar
  • 871

Only top scored, non community-wiki answers of a minimum length are eligible