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Showing content from https://docs.darktable.org/lua/stable/lua.scripts.manual/scripts/contrib/rl_out_sharp below:

darktable lua documentation - RL_out_sharp

RL_out_sharp.lua - Richardson-Lucy output sharpening using GMic

This script provides a new target storage “RL output sharpen”. Images exported will be sharpened using GMic (RL deblur algorithm)

set sigma = 0.7, iterations = 10, jpeg output quality = 95, to correct blur due to image resize for web usage

• start this script from script manager
• in lua preferences, select the GMic cli executable
• from “export selected”, choose “RL output sharpen”
• configure output folder
• configure RL parameters with sliders
• configure temp files format and quality, jpg 8bpp (good quality) and tif 16bpp (best quality) are supported
• configure other export options (size, etc.)
• export, images will be first exported in the temp format, then sharpened
• sharpened images will be stored in jpg format in the output folder

GMic command line interface (CLI) https://gmic.eu/download.shtml

MAC compatibility not tested Although Darktable can handle file names containing spaces, GMic cli cannot, so if you want to use this script please make sure that your images do not have spaces in the file name and path

Marco Carrarini - marco.carrarini@gmail.com

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