Settings

Item	Description
Display bit	16 bits is recommended. This describes how image is parsed from RAW file. 16 bits will consume more video memory but can usually cover all the 12/14/16 bits data from RAW file.
Loading thumbnail	Display a scaled thumbnail if true. Display black loading screen if false.
Zoom at AF point	When zooming to 100% from the shrinked size, it can automatically zoom to the AotuFocus point if it exists. Otherwise, it will zoom to the cursor position.
Cache round	Rounds to cache the previously opened images.
Color space	Display color space for images. This won't affect the thumbnail list part which always displays in SRGB.
Export associated	This sets the associated file rules in exporting. The delimiter must be `/` `$` means the raw file name without the extension(Like `DSC00032`) `#` means the raw file name.(Like `DSC00032.ARW`) For example: `$.JPG` means also copy a file named `DSC00032.JPG` `#.xmp` means also copy a file named `DSC00032.ARW.xmp` `$.xmp` means also copy a file named `DSC00032.xmp` Example: `$.JPG/#.xmp` <- this means it'll also copy the JPG file and the darktable generated xmp file.
UI Scale	This can sacle the whole UI for fit some HD display environments.
Threads	Set the thread number to use.

Item	Description
Renderer	For most cases, GLES3 is the best choice. However, if your graphics card is too old, you have black screens when opening photos or performance problems when opening too many photos at the same time, you can still choose to use GLES2.
Shadow Threshold	This is the upper limit of the shadow clipping shader.
Highlight Threshold	This is the upper limit of the highlight clipping shader.
One channel	When it is enabled, either red, green or blue above the highlight threshold will activate the highlight shader. When it is disabled, it requires all three channels to be above the highlight threshold.
Default EV	The default exposure value of a parsed photo.
Default Gamma	The default gamma value of a parsed photo.

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