Hi,

Thanks very much for your kind help and comments, GVdid1 and Enrique. Your observations and suggestions were really helpful.

After consecutively reducing the JPG compression rate when saving in Photoshop ("Quality" setting, 12 is maximum), and individually copying resulting images to iPhone 4S, I have found the problem! When I went all the way down to 4 in this setting and the photos were still taking ages (15 secs at least) to preview when copied to the iPhone 4S, I suspected it was something else.

It turns out that the "Format options: under the "Quality" setting is the culprit. For me, this was set on "Progressive". After I changed this to "Baseline optimized" and copied to iPhone again... Presto! And you can still use a quality setting of 12 :)

Neat... I'll certainly use this option in the future, as it seems to preview as before with no difference on the computer as well. Thanks again guys!

Ceri

Hi,

Thanks again for your helpful and insightful replies.

I just tried replicating the problem by copying different photos between the MacBook Pro, iPhone 3GS, iPad 2 and iPhone4S. All worked fine (with older devices displaying more "blur/delay" time, as expected).

I discovered the problem was actually only happening with some photos that I had retouched and saved using Photoshop on my computer. After saving them as JPG files (quality factor 10) on the notebook and then copying them back to the iPhone, the display time takes WAY longer. It seems that the Photoshop JPG format is slightly different/incompatible/larger than the standard i-device format, so those devices struggle to display the images.

So, although the file sizes were only 3.4MB, after being saved on the Mac (and presumably PC too) with Photoshop the images didn't display well on other devices. Apparently not all JPGs are created equal... I'll do some more research and let you know if there is an optimal Photoshop JPG compression ratio that doesn't cause this... but for now, if I want to display photos quickly on the iPad, etc. I won't do the retouching/saving in Photoshop on the Mac.

So, to summarize... this is NOT a fault of the app (or Photoshop), just a little file format quirk :)

Sorry for wasting your time guys, I really should have figured this one out earlier!

Thanks again :)

Ceri

Hi,

Wow! That's a lot of really fast responses! Thanks very much for your help.

What I did was to first transfer some photos from an iphone 4S to my MacBook Pro, then transfer those photos (from the notebook) to the iPhone 3GS. So, theoretically they should match the target device's resolution. But there is definitely a considerable delay in the photos going from blurry to clear. Also, it sometimes even happens after the photo has become clear and I swipe to return to re-view it (I mean it goes blurry again). I was showing people a bunch of wedding photos that we transferred so the delay was a bit of a drag.

It's not a huge problem... I'm just curious to see if I can rectify it. Im wondering if it could be a 3GS glitch?

Thanks again all,

Ceri