Version: (using KDE Devel) Installed from: Compiled sources OS: Linux It applies to all plugins with histogram or curves manipulation. When moving points of histogram/curves digiKam tries to make live update of preview. It takes much of resources and computer neither really succeeds in updates of preview nor reacts smoothly for mouse movements preventing precise settings. Maybe my machine isn't up to date (Sempron 2200, 756M RAM) but I believe it may affect also many newer computers. I am leaving this as a bug, not wish, because IMO it makes comfortable usage of program very hard. GIMP - dedicated graphics operation program - doesn't make live update, Pixel also doesn't do this.
New Gimp 2.4 now has digiKam behavior. Don't like it but should be noted :) Downgrading to Unconfirmed.
Mik, there is a timer of 500ms which is used to delay render when you change settings (from slider for ex.). This prevent multiple render at the same time when you change a value. This is not enough ? Gilles
Of course, timer values are somehow system dependent, so this can be problematic. Question: is the curves operation for the preview done on a small bitmap? (If yes, it should be reasonably fast ... ;-).
Hmm. Don't know what changed recently but it feels much faster and using of curves is quite comfortable. Closing as WORKSFORME