## 10.3. Using darktable-chart

### 10.3.1. Overview

With darktable-chart we provide a tool for extracting luminance and color values out of images taken from color reference cards like IT8.7/1 charts. Its main purpose is to compare a source image (typically a largely unprocessed raw image) to a target image (typically a JPEG image created in-camera) and produce a darktable style that is able to convert luminance and color values of the source image to produce the target image. This style employs the base curve module, the input color profile, and the color look up table module for that purpose (see Section 3.4.1.4, “Base curve”, Section 3.4.3.11, “Input color profile”, and Section 3.4.3.6, “Color look up table”).

Some cameras are particularly advanced in offering various film simulation modes of your choice. With the help of darktable-chart and the underlying modules you can now create styles that replicate these film simulations from within darktable.