The Ultimate Lighting Overhaul (ULO) mod for Shadowrun Returns can sharpen the image and make colors more vibrant. It's very easy to install and configure. Once you unpack the desired sub-folder (ultra, high or lite) from the desired folder (enhanced, fantasy or grim) to the main game folder, you can also enable or disable features in the SweetFX_settings.txt file. I used the Enhanced Ultra combo with bloom, HDR and lumasharpen, and it looks great! You can also enable splitscreen to see the difference, so you know you're not imagining stuff.
Download ULO Shadowrun Edition from Nexusmods