The choice of operator is just a choice of what get closest to what you want. At our hands we have ‘global tonemap’ module in darktable which has 3 standard implementations of tonemappers, reinhard, filmic response curve and drago. This blog post is not about doing cartoons and therefore i will not go though a process of doing such thing. There are 2 variants of tone map operators, global and local, local tone map operators tries to preserve contrast, some is better than others but in general will make the image look unrealistic and are commonly used to do “artistic” HDR images. We should now apply a tone map operator, which purpose is to compress a high dynamic ranged image into a lower range suitable for display on screen etc. This is just a starting point for both night and day shoots, you will likely get back to this step for fine tuning the end result so don’t spend too much time on this step for now, just do a rough estimation of what you think you want according to the 2 approaches described above. shadows contains details and have a nice dark tone. If you process a daylight shoot for example a room with windows where you have a indoor scene and sunlit outdoor scene, the approach will be to adjust exposure so the darkest part of the image eg. If you have a night shot with a few light sources you should now correct the exposure of the light source to bring back as much detail into light source without lowering its intensity so it end up looking dull. The first thing to do now is to settle a base for further processing correcting the image exposure, the approach differs between processing a day or night shoot. Load your HDR image into darktable, and enter darkroom, the image will probably look very strange and the first thing is disable all auto applied modules by selecting the “active group” and turn off all modules. Processing the HDR image using darktable Step 1 I’m not going into details of the process of making an HDR image, there are many guides out there describing manual methods or automatic ones which some cameras have, but basically, take a bracket shot of your scene and import them into darktable and do no processing at all, export to 16bit tiff and import the tiff files into luminance hdr where you use its align and merge HDR functionality, when HDR is merged and cooked just save the image as EXR image format which you load into darktable for further processing. The example image used in the screenshots can be downloaded at following link: AtriumMorning How to make an HDR image Press F or ESC to return to the original view.This blog post will go through a simple workflow when working with high dynamic ranged images using darktable and the modules for processing, you need use darktable 1.1RC for this guide. In sticky preview mode, you can zoom and pan within the image in a similar way to the culling mode. If you want the full preview to stay in place without having to hold the W key, you can enable sticky preview mode by pressing F. Sometimes pressing W or Ctrl+W may not appear to have any effect – in such cases, click on the image thumbnail and press the corresponding key again. Note that this is not the same as the focus peaking indicator, which is another way to identifying areas of sharpness within an image. If no such regions are found, any regions of moderate sharpness are identified with a blue border. Regions in the image with a high level of sharpness are indicated with red borders. For this tool to work the input image needs to hold an embedded JPEG thumbnail, which is the case for most raw files. Pressing and holding Ctrl+W fully zooms into the image and also identifies any regions of sharpness in the image that may indicate image focus. This is useful to more closely inspect an image while rating and selecting images. From any of the lighttable modes, you can display a fully-zoomed preview of the image that is currently under the mouse pointer by pressing and holding down W.
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