Useable.

I mentioned a while back that I would comment on how Lightroom 2 runs on an older Mac. I had tried LR 2.1 on my 6 years old iMac (IBM G4 1.25gHz CPU, 1 mB of RAM) and it was not useable for localized adjustments such as the adjustment brush. You would paint something on the screen and many seconds later the effect was visible. Not useable.

Well, Adobe released Lightroom 2.2 the other day so I loaded this up on both the MacBook (Intel C2D 2.1gHz, 4 gB RAM) and the iMac. First, on the modern machine the adjustment brush is now fully useable. Changes occur almost in real time – say a fraction of a second delay as you ‘paint’. In this comparison, the MacBook is running OS Leopard 10.5.5 whereas the iMac is on OS Tiger 10.4.11.

Moving over to the iMac things are quite encouraging.

For purposes of what follows I was using a RAW file from my Canon 5D, so both machines had to perform RAW decoding prior to display of the picture. A RAW file from the 5D is some 12 mB but once converted comes to some 60gB. Not small, in other words. As usual, I let LR generate full-sized previews on import – it takes longer but the payback when processing is immediate. Images pop on the screen far faster this way.

LR 2.2 on an old iMac

Loading LR takes 20 seconds (versus 7 on the MacBook) and the first switch from the Library to the Develop module takes a long 30-35 seconds (MB – 7 seconds). Thereafter, switching between the Library and Develop modules takes 3 seconds (MB – near instantaneous). But, most importantly, the greatest advance in LR2 compared with LR1, localized adjustments, is now quite useable in LR 2.2. I can ‘paint’ on the screen using the mouse and see the adjustment within a second or so – made even easier by using the mask-display routine outlined here.

This little test discloses just how much faster the Core 2 Duo architecture of the Intel chip is over the IBM G4, but also shows the fine job Adobe has done of keeping those older machines in service. If you cannot afford the latest Mac, $300 for a nice 15-17″ display on an older G4 iMac will serve you just fine and there are lots of these older machines around going for a song. While I sold my G5 iMac a while back when the MacBook came along, I would guess that the G5 CPU will be speedier than the G4, much as it was using Photoshop CS2 when I first got the G5. The G5 iMac routinely sells for $350 – $400. A spectacular bargain with clean looks and a nice big screen.

If JPGs are your thing, then a G4 or G5 Mac should just fly. And they sell for a lot less than a new Mac when the current bottom-of-the-line MacBook (mine!) sells for a very overpriced $900 and iMacs start at $1,200. That money saved gets you a another lens for your DSLR and a great computer for Lightroom 2.2.