Lightroom vs Aperture
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M$2 Answers
http://stuartforsyth.com/2009/01/12/the-aperture-vs-lightroom-shootout/
Lightroom wins if you do anything other than point-shoot.
Aperture wins if you want a little bit more control than iPhoto offers but you still only want to breeze through family photos.
I generally tell people, if you take your camera off of 100% automatic mode, use Lightroom.
Here's why:
- Lightroom is completely non-destructive. No matter what you do, your originals will still be there.
- There are more adjustment options in lightroom.
- Workflow (the way you organize and adjust photos) is open and natural in Lightroom - there are simple left and right hand columns that provide easy access to functions
- Lightroom works a lot better with photoshop - together photoshop and lightroom are better than Rick Ashley in a sports jacket.
- Lightroom uses multi-monitor setups like a champ - you can edit in one and (in real time) see the results on the second.
- Lightroom is multi-platform. This is handy if you ever want to open up a catalog of photos on a PC. Occasionally, I'm stuck at a print shop with PC's and need a last minute adjustment. This is easy for me because LR works on PC's.
- Last, Lightroom connects easily to Flickr, Picassa, etc... but it also has a full template engine built in to build online gallery pages for your blog (or whatever) or printed layouts.
Aperture and Lightroom are both very good. I suggest that you try them both but if you're anything like me, Lightroom will easily win - for now anyway.
http://fromtherubberroom.com/wp-content/uploads/2008/02/adobe-lightroom.png
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M$Aperture is a step up from the iPhoto software that comes with every Mac, and fairly easy to learn. Adjustments are made in a logical order from top to bottom of the menu. You can store the images in a library or any folder you choose. Aperture also works really well with my Canon RAW files. The speed has been improved in version 2.1.4, which was an issue on some older versions.
At this time, there have been reported bugs with Adobe Light Room and Photoshop CS4 when used under Snow Leopard. But they are generally great products also.
I still use Photoshop for final JPEG output to some of my clients. I also use a program called Photo Mechanic, which is the fastest way to edit a large batch of photos on deadline. Most editorial photographers use this camerabits.com application in the field. They also offer a windows version.
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M$"Adobe Light Room and Photoshop CS4 when used under Snow Leopard."
I've only ran into 1 bug. It was fixed in an update the next morning. The bug was when I merged photos to create an HDR from LR into PS, PS took an abnormally long time to render the photos. Today - no problems whatsoever. There could be bugs, but I don't see them.
"Photo Mechanic, camerabits, etc" - these are all eliminated with LR. I send clients an online contact sheet (for web photos) or an identical printed contact sheet (for print photos) with 2 clicks. GPS meta data, DNG support, Loupe views, etc are all part of Lightroom.
This could easily turn into an Aperture vs. Lightroom flame war. In the end, the only real differences are in workflow. Try them both for a few sets of photos to see which one you feel more comfortable with. There really isn't a better way.

Not to be a flame war, I have used them all. Referring to bugs when used with Snow Leopard.
tech note from Adobe:
Editing in Photoshop CS4 fails from 64-bit Lightroom in Mac OS X 10.6 (Snow Leopard)
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ISSUE
When you Edit in Photoshop in Adobe Photoshop Lightroom running in 64-bit, using the Merge to HDR, Photomerge, or Open as Layers options, and you have more than three files selected, Edit in Photoshop fails.
SOLUTIONS
Solution 1: Run Photoshop Lightroom in 32-bit.
Solution 2: Reduce the number of selected photos to 3 or fewer photos before editing in Adobe Photoshop CS4.
http://kb2.adobe.com/cps/513/cpsid_51339.html
That might have been why the solution to this bug was so easy for my particular case... when I create an HDR, I never use more than 3 exposures.