Dmitri Popov's blog

digiKam Recipes 4.1.1 Released

Another month, another digiKam Recipes update. This version features the updated and expanded Edit Photos with the Levels and Curves Adjustment Tools recipe which now covers the powerful curves tool. As an experiment, the EPUB version of digiKam Recipes now comes with the embedded Open Sans font family. As usual, there are also minor tweaks and fixes.

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digiKam Recipes on Google Play Store

digiKam Recipes is now available on Google Play Store. So you can buy and read the ebook using your favorite Android device.


digiKam Recipes 4.0.11 Released

As you may recall, I recently switched to as my primary publishing platform. Alas, my experiment didn't last long. Everything worked smoothly until I encountered a rather serious issue: for some reason, EPUB, MOBI, and PDF files generated by the service didn't include any images. I duly submitted a bug report and tried to contact the developers via Twitter, but I got no response.

This is not the end of the world, of course, but it's a good reason to find a better and more reliable alternative. I did some research, considered the available options, and decided to go the DIY way. Continue to read

digiKam Recipes 4.0.9 Released

Hot on the heels of the 3.17.01 release comes a new version of the digiKam Recipes ebook. As the version number indicates, this is a major release that features several significant improvements.


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digiKam Recipes 3.17.01 Released

A new version of the digiKam Recipes ebook is available for download. The new release features a slightly tweaked cover and the new Fix keywords with ExifTool recipe.


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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 digiKam is no exception: the Debian stable repositories contain a version of digiKam which can be considered outdated.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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