If you will Google it a bit there are many complains for this issue: why the colors on my photo uploaded to some website are not so vibrant as on my laptop/desktop?!? The answer is pretty simple: mismatched color profile.

A bit of technical background (let's take jpeg image format and sRGB color space as most used): the ColorProfile is embedded as text (aka metadata) string in you jpeg file. And it will not touch any image pixel data stored in jpeg. In ideal world your hardware and software (say operating system, display, video card, browser, printer etc) should read and obey it to give your image the colors according to embedded metadata. But unfortunately it is not yet so despite ICC standards are available for many years.

Being quite geek I'm one of those early adopter guys. So wonder what? I've migrated my Aperture 2 library to just released Aperture 3. You may wonder why wouldn't I use Lightroom, but well, I just like Apreture's workflow + look and feel a bit more. That's it. Also faces and locations in Aperture 3 (apparently migrated from iPhoto) are just killer features comparing to Lightroom.

Migration was quite easy but it took quite a time to rebuild the Aperture's database to a new version. You can migrate from previous library, old vault or my way was to save (export) projects from v.2 to external drive and import them in v.3 one by one afterwards. This also helped me to clean up some older projects which were on standby for quite a long time.