| Re: Aperture 2
Think of it like this:
Photoshop, iPhotos and Fireworks are photo editing tools (strictly speaking Fireworks is a graphics editing tool). They let you change colours, crop, sharpen etc but also let you add text, add other images, add layers etc. On top of this they also have a RAW processing engine to process RAW images (except Fireworks).
Lightroom and Aperture are Digital Asset Managers which means that they let you create extensive catalogues/libraries of all your photos, add keywords and other metadata. They also allow have very powerful RAW processing engines and let you perform other editing functions like croping, rotating, adding vignettes etc. What they can't do is create montages from several images, use layers, do selective colouring, dodging, burning etc.
One of the biggest advantage of Aperture/Lightroom over Photoshop/iPhoto/Fireworks is that I can take one RAW file and create infinite varitions of it each with different exposures, colour balance, crops etc etc etc and not take up any more disc space. This is because the instructions on how to make this variations is simply stored in a database. To do the same in Photoshop etc would require seperate TIFF/JPEG files of each variation.
On top of that with Aperture/Lightroom you can use one image to export any number of new images all at different sizes, formats and compression rates all at the same time. You can do the same in Photoshop etc but it's not as elegant or straight forward.
Which do you need? Well that very much depends on what you need and want? If you don't need to catalogue your images and don't have any concerns over disc space then just use Photoshop/iPhoto etc. If however the flexibility of Aperture/Lightroom appeals to you then it is well worth checking them both out.
I used to use Photoshop CS2 exclusively, then Lightroom came out but I didn't like it but liked the idea behind it so tried Aperture and loved it. I now have Aperture 2 and CS3 but rarely have the need to use CS3 at all, in fact I totally regret upgrading to it as although it is a great piece of software I now do 98% of all my editing in Aperture.
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