overview
darktable-chart is a tool for extracting luminance and color values from images of color reference cards such as 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 use the luminance and color values of the source image to produce the target image. This style employs the tone curve module, the input color profile module, and the color look up table module for that purpose.
Some cameras offer various film simulation modes of your choice. With the help of darktable-chart and the underlying modules you can create styles that replicate these film simulations from within darktable.