White Balance not working

Is it only on certain images that the white balance pipette tool does not work, or is it a general problem?

If it does not work on any images, delete the Aperture Preference files, as described in

Aperture 3: Troubleshooting Basics: http://support.apple.com/kb/HT3805

for sometimes user interface elements do not work, when preference files are corrupted.

If only some images cannot be adjusted, then try the library "first aid": repairing permissions and library.

Regards

Léonie

Ian -- Rebooting my clear this clog. Worth a check prior to the further trouble-shooting Léonie recommends above.

With the WB eyedropper ("pipette" is better, imho), I have better results when I zoom the Image to 100% first -- but that's for getting it to select the correct pixels, not for getting to select _any_ pixels.

Post back with your results, if you don't mind. It's unusual, at least afaik.

1+! Reboot first!

OT: Kirby, I grew up with Unix machines, and I still feel the normal "up time" of a healthy system should be at least a year without reboot - that is why I always forget about "reboot". To me, rebooting is synonym to surrender and disgrace; even if I know perfectly well, that to keep your Mac happy, alive, and kicking, you should reboot frequently - to clear Memory Leaks, etc. But really, system software should not be leaking memory in the first place.

Usually I reboot only, if there are memory leak warnings in the Console window, or if I want to avoid force-quitting an unresponsive Application, but am too lazy to terminate it from the Terminal Window.

Regards

OT:

I grew up with Windows 3™ 😊^oo . As a consultant, the second question was always, "Have you rebooted?" (The first, of course: "Is your computer plugged in and turned on?"). If you had to do a "hard boot" after every command, you knew that you'd found a real bug.

Apple's OS has declined substantially in "normal up time" in just the last few years (I am pretty sure I didn't re-boot my first Mac until I upgraded the OS -- and I'm on only my second Mac). Such, I suppose, is partly what one pays for run-away success.

(The first, of course: "Is your computer plugged in and turned on?").

That hasn't changed at all over the years 😁

I think you forgot ...

Did you do a clean install of the OS? (always my favorite)

Although rebooting a PC can cause other issues. I recall reading about a user complaint where rebooting caused their cup holder to stop working. When the system rebooted, the CD tray was pulled back in.