Calibrating the iPad display

As I'm using the iPad with the wonderful Air-Display from Avatron, I was wondering, if I could calibrate the display to get even better color accuracy when editing photos "in the field" on my Macbook Air.

Turns out, I can.

Here's how to do it.

First activate Air Display and make sure you don't select "use Retina Resolution if available" or otherwise you'll end up with a Spyder3 window that is far too small to be of any use. After calibration turn it back on again as it is just marvelous to look at pictures on a nearly 300PPI display.

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Set the brightness of your iPad to a mid-range level. Cranking it all the way up may look great, but tends to seriously fuck up the calibration and gives me a headache.

Now fire up the Spyder3 application (or whatever software you use) and select your iPad as calibration-target. The application window should move to the iPad display.

Lay the iPad flat-down, place the sensor on it and start the calibration.

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That's it. Just wait a few minutes and you'll have your color-profile.


I think there really is no need to go through all of this. The calibrated output varies so little from the factory preset, that you'll only see a difference under optimal lighting conditions and in a direct comparison.

The iPad display (at least from the iPad 3) is just fantastic. Color reproduction even for highly saturated colors is accurate and the gamut is mind blowing.

Just take a look at these charts:

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Red: iPad 3, blue: Apple LED Cinema Display 27"

Spyder3Elite 4 0 2

Red: iPad 3, blue: Wacom Cintiq 24HD

Spyder3Elite 4 0 2

Red: iPad 3, green: sRGB, purple: AdobeRGB (mostly NTSC)

Remarks to a small percentage of readers: This process does not calibrate your iPad display per se. It only works when acting as an external display with Air Display. There is no need to tell me this in the comments. This may be what you're looking for: Datacolor Spyder Gallery.

Also, you do not have to ask me "Why did you do this when you say later there is no need?". There are other ways to prove that you're an idiot. Be creative.

Apple releases Aperture 2.1.2

Apple released a minor new version of Aperture 2 today.


"Printing of commercial products through Aperture has been improved. Apple has released Aperture 2.1.2, which "improves the printing quality of books, cards and calendars ordered through the Aperture printing service."

I downloaded it this morning and none of the annoying errors from the previous version are gone (namely the bug where Aperture doesn't start when you have a vault-backup on a mounted network-volume).

Get it via Software Update or download it here.


Remove all copies of a file from a time-machine backup

It's nice to have time-machine as it works flawlessly most of the time. It's also very nice to go back in time to a specific version of a file.

But sometimes you need to get rid of ALL copies of a file for different reasons.

Here's how:

1. Startup time machine by either hitting the icon in your dock or clicking the time machine icon in your menubar and then selecting "Start time machine".

2. Navigate to the folder/file you want to delete and select it.


3. Click the "gears-icon" in the toolbar and select "Delete All Backups"


That's it. If you wanna play safe, do a free space wipe of your time-machine volume to ensure all evidence is gone ;-)

Finally, AppleJack compatible with Leopard

I hope you never run into a situation where your Mac does not boot fully into the finder, but when you are, you can be assured of not having a bootdisk handy...

So here's the solution: "Applejack" by Kristofer Widholm


AppleJack is a user friendly troubleshooting assistant for Mac OS X. With AppleJack you can troubleshoot a computer even if you can't load the GUI, or don't have a startup CD handy. AppleJack runs in Single User Mode and is menu-based for ease of use.

You can use it to repair your disk, permissions, validate and fix the system's preference files and clear your (possibly corrupted) cache.

Just download it, install it onto your system disk and the next time you're running into trouble, just fire up the Single-User Mode of your MAC by holding command + s on bootup. Type "applejack" or "applejack auto" and let the magic begin.

I used it on my Tiger System quite a few times and everything turned out A-OK afterwards.

If you don' trust me, here's a list of user experiences with AppleJack.

If you need an in-depth article about troubleshooting your MAC with AppleJack, MacFixIt has a nice article on it.

Simplify "scanning libraries" indefinitely on 10.5.3

I'm using "Simplify" for sharing my iTunes library with some people and especially myself on my iPhone.

Unfortunately I recently had some problems getting it to work on my Leopard Server, running 10.5.3.


Simplify support was extremly helpful and blazing fast. Using the built-in Troubleshooting tool, I sent them some logs, the XML of my library and a brief description of the error.

The app was always saying "scanning libraries" and nothing else happened.

Here's the mail from support:


Thanks for the heads up and sorry for the problem. Our app is unable to connect through your network, per the error below:

Network Scan Status: NAT test error
Network Type: 0x0 (hairpin = false)

We have seen this on a few other systems running Mac OS 10.5.3, and in all those cases, upgrading the latest Mac OS version solved the problem.


It turned out, it's the 10.5.3 that's causing the problem. After an update to the newest 10.5.4, everything is back to normal and works as expected.

Thanks for the great support and keep up the good work!

Automatic podcast removal and cleanup with Cast Away

iTunes does a great job downloading and syncing podcasts to my iPods / iPhone. But what it really lacks, is some kind of management functionality to delete outdated podcasts.

Cast Away fills in the gap so far left in iTunes. It allows for the scheduled removal of podcasts on a per podcast basis with lots of options.


Get it from

Trial is available, full version is seven bucks.

Move MOZY installation to another machine

Today I ultimately went from OSX 10.4 Server to 10.5 Leopard Server.

The whole process went smooth and without any major problems. However, I was a bit worried about moving Mozy, my online backup, to the new setup. Most of the files to be backed up, are stored on an atttached Lacie Biggest Disk with a Raid 5 setup, so the hash and the location of most of them wouldn't change.

For those of you who don't know Mozy go to and download the trial. It's free for 2GB of storage and about 5 bucks a month for the unlimited service.

I really like Mozy. It's easy to set up and works flawlessly in the background. I regularly do some restores, not a single problem until today. But make sure this is just ANOTHER line of defense against data loss and not your ONLY ONE!


I didn't do an upgrade, instead I chose to start with a fresh install. Over the last 2 years with a 10.4 server I installed a lot of junk and the configuration was... I admit it, a bit scrambled.

So, here's how I moved my Mozy installation from 10.4 to 10.5:

1. Make sure to run a last backup on the old machine.

2. Copy the contents of the folder "/library/Application Support/Mozy/" to a disk accessible from your new system. Remember: This is NOT in YOUR home directory, it's in the SYSTEMS Library folder!

3. Make a new directory in your new systems /Library/Application Support/ folder and name it "Mozy".

4. Copy the files from step 2 in this directory.

5. Make sure your new system has the SAME computername as your old, otherwise Mozy will totally fuck it up.

6. Download and install Mozy.

7. Startup Mozy for the first time, click "Configuration" and let mozy figure out how much backup space will be needed. After that click SAVE, restart your server and you're done.