Dmitri Popov's blog

Buy digiKam Recipes, Get Raspberry Pi for Photographers

Small, affordable, and versatile, Raspberry Pi is a perfect platform for all kinds of creative projects. And as a photography enthusiast, you can put this tiny machine to a variety of practical uses. Transforming Raspberry Pi into a photography tool is not only great hacking fun, it also opens a whole new world of photographic possibilities. The Raspberry Pi for Photographers ebook can help you to turn a Raspberry Pi into a tool for fetching and managing photos, publishing photos on the web, controlling your camera remotely, and keeping your photos safe.


When you buy the digiKam Recipes ebook, you'll receive Raspberry Pi for Photographers free of charge. Continue to read

Install the Latest Version of digiKam on Debian

There are plenty of reasons to choose Debian, but having the most recent versions of your favorite applications is not one of them. Software updates trickle down to the stable version of Debian very slowly, which means that packages in the distro's repositories are likely to be a few versions behind the current releases. digiKam is no exception: the Debian stable repositories contain a version of digiKam which can be considered outdated. However, if you don't mind the risk of making the Debian system unstable, or even breaking it altogether, you can opt to upgrade the distro to unstable and then install the latest version of digiKam from the experimental repositories.Continue to read

Apply EXIF Metadata to Multiple Photos in digiKam

If you happen to use digiKam for managing photos scanned from negatives, you'll appreciate the application's capabilities to add and edit EXIF metadata. Using digiKam's dedicated interface for managing metadata, you can add key EXIF values, such as maker, device model, aperture, shutter speed, ISO, focal length, etc., to the scanned photos (provided you have these data handy).

Editing EXIF in digiKam

However, digiKam doesn't allow you to apply the same EXIF data to multiple photos in a single operation.

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Sharpening in digiKam

The Sharpen tool in digiKam offers three sharpening methods: simple sharp, unsharp mask, and refocus. Each method has its advantages and drawbacks. The simple sharp technique uses a standard convolution matrix algorithm to improve image details. If you are curious about the nitty-gritty of the convolution matrix, the GIMP documentation provides a brief description of the algorithm.

Using the Refocus sharpening method

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Dealing with Bugs in digiKam

Bugs are inevitable in complex software, and digiKam is no exception. So what should you do when you've discovered a bug in your favorite photo management application? As a non-programmer, the best thing you can do is to file the bug with the KDE bug tracking system (digiKam is managed as part of the KDE project). Submitting bugs can be considered a tedious task, but this greatly helps the developers to improve digiKam, and the KDE bug tracking system makes it relatively easy to file bugs and issues.

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Create a Bleach Bypass Effect in digiKam

Using tools available in digiKam, you can simulate a number of effects, including bleach bypass. This effect produces a desaturated high-contrast image. Creating the bleach bypass effect in digiKam is done in two simple steps.

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Basic RAW Processing in digiKam

For this project, we'll use a photo of the famous Sagrada Familia cathedral in Barcelona, Spain. The photo was taken with a Canon PowerShot S90 camera, and the RAW file exhibits several obvious flaws, including visible barrel distortion, underexposed areas, and noise. In other words, this particular RAW file is perfect for tweaking in digiKam.

Configuring RAW decoding

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Export Photos from digiKam via DLNA

Need to quickly push photos in digiKam to a device on the same network? Provided the device supports DLNA, you can do this using the DLNAExport Kipi plugin. Choose Export ? Export via DLNA to open the DLNA Export wizard. From the Choose the implementation drop-down list, select either HUPnP API or miniDLNA. Both options have their advantages and drawbacks.

Using the DLNA Export Kipi plugin

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digiKam Recipes 3.11.01 Released

A new version of the digiKam Recipes ebook is available for download. The following material has been added since version 3.9.39:

  • Create a Bleach Bypass Effect
  • Export Photos via DLNA
  • Process Film Negatives
  • Calibrate and Profile Monitor for Use with digiKam
  • Use Photoshop Curve Presets with digiKam
  • Import Photos from a Remote Server into digiKam

As usual, the new release features minor fixes and improvements. Continue to read

Process Film Negatives with digiKam

While digiKam is first and foremost an application for processing and organizing digital photos, it also features tools for working with film negatives.

Using the Color Negative tool

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