DT 5.3.0+970
Every new mask I create has opacity 70% and even if I change it to something else, the next new created mask has also 70%. Can I change the default mask opacity to some other value?
Thanks.
For all drawn shapes, you can hold Shift while scrolling with the mouse wheel to change the extent of the shape’s feathering (the blur at the edge of the shape) and use Ctrl+scroll to change the shape’s opacity (how transparent it is). These operations are available in both creation and edit modes (as long as your mouse is over the shape in question).
By default, scrolling your mouse up increases the value of the relevant shape parameters. This behavior can be changed in preferences > darkroom > scroll down to increase mask parameters.
Note: When used in shape creation mode, the preceding scroll operations will also cause the default feathering or opacity to be changed. The new default values will be used the next time you create a new shape.
(darktable user manual - drawn masks)
So, to restore 100%: click the shape creation tool, and use Ctrl+scroll to change the default opacity before you create your shape. Observe the hint messages above the editor.
Then refrain from using the scroll wheel while creating shapes, and only use it when editing one.
9 Likes
Istvan has already provided the correct answer for you. I just include these images for clarity that mask opacity is shown along the top of the screen and is controlled by ctrl+scroll. It is a sticky setting applied upon creation of the shape. I often get caught out by this, but the solution is easy once you know.
1 Like
Thanks, for some reason, I was missing this piece of info. 
1 Like
We’ve all been there 
5 Likes
More than once with mask opacity. It is now burnt into my brain.
1 Like