blog

Lens by Houz

On Lens Detection and Correction

darktable (and some other projects, like for example ufraw) don’t do any real lens detection or correction by itself. We depend on two libraries which in most cases are provided by the Linux distribution you’re using. Lens Detection Many image files contain metadata about how the image was created. In case of digital camera images, a standard called Exif is used, this standard allows a camera to record many details … Continue reading

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Print Module

After being in the camera our pictures deserve some love and to be shared. Every photographer will tell you the joy of having a picture in the hands. At last the pixels have taken form on a piece of paper to give birth to a photography which can be put on the wall! Though, printing is not easy, there are many technical aspects to take into account. To streamline this … Continue reading

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Luminosity Masks in Darktable

Pat David has a great blog on photoediting in GIMP. I recently read his post on luminosity masks and was fairly impressed. Can darktable do something similar? Yes – they’re a special case of parametric masks. I thought I’d post a quick tutorial on luminosity masks using parametric masks. First, I strongly suggest you read Pat David’s post and thoroughly understand what’s going on. A quick and simplistic explanation follows: … Continue reading

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Using X-Trans cameras with darktable

There is now a development branch of darktable with experimental support for raw files from many recent Fujifilm cameras. These cameras include those with the X-Trans sensor (X-Pro1, X-E1, X20, X100S, X-M1, XQ1, X-E2, and X-T1), X-Series cameras with conventional sensors (X100, X10, X-S1, XF-1, X-A1), and some from Fujifilm’s other lines (S6000fd, E550, IS-1, S3Pro, S5Pro, S5600, E900, S2Pro, S5000, S5200, S5500, S6500fd, S9500, S9600, S9600fd). Previously, darktable would … Continue reading

Mark

Libre Graphics Meeting 2014 in Leipzig, Germany

Yes, it’s this time of the year again. The annual Libre Graphics Meeting is getting closer, and we, that is the whole developer community of your favorite free graphics applications, would like to ask you for your help. Some of you might remember our call for sponsoring from last year. Back then we asked for donations for specific people – a task that didn’t work out that well in the … Continue reading

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Of Histograms and Waveforms

People using image editors or similar (raster) graphics editors are probably familiar with histograms. You also have them in almost all digital cameras. In darktable you can find it very prominently in the top right corner of darkroom mode, but also as a backdrop of modules like levels, tonecurve and similar. From a mathematical point of view they are a diagram displaying the amount of pixels in the image that … Continue reading

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determining focus in lighttable

wouldn’t it be great if you could judge sharpness of your images in lighttable mode? this mode is limited to small and medium sized thumbnails of your images, so we can deliver the required speed to browse a lot of them. to tell whether or not you got the focus right during the shoot, we would like to look at the full resolution. the most you get out of lighttable … Continue reading

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about basecurves

the purpose of the basecurve is to make the otherwise scene-referred linear (linear raw rgb) color look good on your output devices. this is done independently of any color managed transforms which are also done in the pipeline, so we can establish a certain look independent of the devices. this will affect how highlights and shadows are balanced against each other, the overall contrast of the image, as well as … Continue reading

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Using Lua with darktable

The next major release of darktable will contain multiple features that have been discussed on this blog and that will make it more powerful than ever. These new features will allow you to process your images in new and creative ways. However there is one new feature in the upcoming darktable release that is more about Digital Assets Management and simplifying your workflow: Lua scripting.

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Display color management in darktable

The general picture on the modern Linux desktop Modern Linux distros featuring either GNOME, Unity or KDE offer fairly easy configuration of color management, this system level configuration mostly pertains to the handling of an ICC display profile. If you have set a display profile via your system configuration tool (The Color applet in System Settings for GNOME or Unity), there are a few things to keep in mind. An … Continue reading