martin's blog

A simplistic GUI to add meta data to your photographs under Linux

Update: Added an adaption for nautlius by Derek Keats.

Images taken with your digital camera come with detailed information about exposure time, aperture, date and location. These meta data are stored in the image file using definitions like EXIF, IPTC and XMP.

Most image viewers allow you to display the meta data and search or organize your library based on them.
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EOS 5D Mark IV and open source software

Today Canon released the new EOS 5D Mark IV featuring a new 30.4 Megapixel full-frame CMOS sensor with ISO range 100–32,000; expandable up to 50–102,400. It records 4K Motion JPEG video and allows to grab 8.8-Megapixel still frames from the movie file.

In addition it comes with an enhanced autofocus, up to 7.0 fps continuous shooting speed, a touch screen and a new Dual Pixel RAW format.
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Compiling darktable on Linux Mint Debian Edition 2

Darktable and RawTherapee are very close competitors and excelent raw processors. Personally I always felt the UI of RawTherapee to be more intuitive, so I just kept using it and only recently realized, Darktable introduced masking features and duplicating of individual modules/filters. Two features filling a gap which made me almost always apply final tweaks to the images using gimp.
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Photographic tipps for your safari adventure

The elephant did not like us closing in on him to get a better picture and started to charge. Luckily he stopped after we put the car in reverse and backed up.
Despite the angry elephant I consider a photo safari in Africa one of the most awe inspiring activities.
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Compiling GMIC on Linux Mint Debian Edition 2

Running a self compiled version of Gimp in parallel to the version from your distribution works fine until you try to use it with high-bit depth version of GMIC.

The following instructions for GMIC will help you to prevent /get rid of the following error:
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Creating and processing HDR images using open source software

This article is a follow up on a Google+ discusson asking how open source software can help us to develop HDR images. It describes the steps I took when developing the images from the Sustenpass in Switzerland.
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Compiling Gimp on Linux Mint Debian Edition 2

Since 2012, the gimp development branch support 16 bit images. The following tutorial explains hows how to compile gimp in 10 minutes for Linux Mint Debian Edition 2. Chances are it works for other debian based distributions as well.
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Susten Pass

A glacier mountaineering course conducted by the German Alpin Club (DAV) is a great experience. Besides learning how to safely move in snow and ice, the course also allowed for some very nice pictures.

Enjoy the impressions from the sustenpass by clicking on the thumbnails. All pictures were created using RawTherapee, Luminance HDR and Gimp.
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You can access the gallery directly using the images below.

Comparison of highpass filters in GIMP and GMIC


When it comes to sharpening an image, a popular alternative to the unsharp mask is the high pass filter. To apply this method, you create the high pass version of your image in a new layer and set its blend mode to overlay. Applying a layer mask allows you to restrict sharpening to certain regions of the image.
Unfortunately gimp does not provide the high pass filter out of the box. You either need to install gmic or the high pass plugin.
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Images from Agadir and Marrakesh.
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You can access the gallery directly using the images below.