Upcoming features: Conditional Blending

or „If one slider is not enough“ Diligent readers of our small blog series are already aware of the blending feature that darktable offers as part of many modules. Instead of just handing over their result to the subsequent module in pixelpipe, “blending modules” take a moment to reconsider. Based on the blend setting they will take their original output together with their input and do a re-processing. As an … Continue reading

Darktable and OpenCL (updated)

Many readers will have already heard about GPU processing and the fact that darktable can make use of OpenCL to improve performance. As we still lack a detailed documentation of that topic, please find here a few explanations and howtos. The Background Processing high resolution images belongs to the more demanding tasks in modern computing. Both, in terms of memory requirements and in terms of CPU power, getting the best … Continue reading

Shadow recovery revisited

One of the remaining shortcomings of digital cameras is their rather low dynamic range in comparison to analog – especially black-and-white – film. Scenes with strong differences between highlights and shadows are very difficult to capture. Even if they are exposed properly with no blown-out highlights they will too often only give acceptable results after extensive post-processing. Fortunately, darktable is progressing with a high pace. Some days ago I wrote … Continue reading

Using lowpass filter to recover shadows

Outdoor photographers are often confronted with unfavorable light conditions. This often entails too high contrast. Two of the most frequent consequences are blown highlights and deep shadows in your digital images. Overexposed highlights are challenging to repair in digital post post-processing, still darktable offers a decent set of valuable tools as long as you take your pictures in raw (see Jo’s blog post “why you want raw”). Fortunately, it’s much … Continue reading

Mastering color with Lab tone curves

or “How to bring the jungle back” Since its early beginnings darktable has a tone curve module that is able to alter the gray level distribution of an image. Recently we did an enhancement: tone curve is now able to control the full Lab color space with separate curves for the L, a and b channel. People who are used to curve tools in RGB, at first might get puzzled … Continue reading

darktable Book Maintenance Release (v1.1.1)

Stefano Fornari has just released a new version of the book Digital photo development with darktable. Version 1.1.1 is a maintenance update. The release fixes a number of typos and other small editorial changes suggested by the community. Check out the pdf or packaged version and, as usual, send your comments and feedback to the darktable user list.

Released 0.9.3

As most of you probably noticed by now, we released 0.9.3. The tar file can be found here: http://sourceforge.net/projects/darktable/files/darktable/0.9/darktable-0.9.3.tar.gz/download Pascal updated his ppa for ubuntu here: https://launchpad.net/~pmjdebruijn/+archive/darktable-release or https://launchpad.net/~pmjdebruijn/+archive/darktable-release-plus (with Exiv2 0.22, and Lensfun 0.2.5 + lens data from svn). and made great new screencasts explaining a couple of features and differences to 0.9.2. You can find them on our resources page or Pascal’s website: http://blog.pcode.nl/2011/11/05/darktable-0-9-screencast-library-addition/ It is a comparatively … Continue reading

different kind of saturation

different kind of saturation there are many different ways of tuning saturation, darktable does offer a few alternative ways to alter saturation and the reason for this post is to clarify what they do and how they work. the image on left is the original untouched image used for the different examples below, use it as a reference for comparing the results of the different kind of saturation described below, the … Continue reading