I have no iPhone 4 here now but I need to know how well is its camera for reading small-size QR codes. Now I have some test QR codes printed on a sheet of paper and my old 1.3MPx smartphone camera doesn't recognize them. So, I wonder how good is iPhone 5MPx camera for doing that. The code I need to be read well from a printed sheet is 16x16mm or so. The size of a single square module is about half of a millimeter now. Please let me know if you have a chance to test it or if you had a deal with such things. Thanks!
IPhone 4 camera capabilities to read QR code
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In my testing1, pictures set on the iPhone itself consistently appear as full screen, and pictures set in Address Book on OS X and synced via iCloud appear as thumbnails. Any photos set elsewhere, but subsequently edited on the iPhone will also appear full screen.
I haven't tested other syncing methods, but from what I've read elsewhere, including the question you linked, I think the syncing method doesn't matter — just whether the photo was set on the device, or on a Mac.
It's hard to say why exactly without any inside information, but I suspect it's one of two reasons:
Different teams worked on the syncing and iOS Contacts app (or at least the user facing portions thereof). Some flag gets set somewhere in the data structure when you set a photo in the Contacts app that doesn't get set when a photo is synced over. Just something that got overlooked.
Intentionally left out. Since you don't get the opportunity to preview the cropping and alignment on the device screen when setting it, it was decided to make pictures assigned off-device just appear as thumbnails, to avoid any bad cropping or weird aspect ratios.
In any event, if you want consistency, you should set all your contact pictures on the same device — Mac if you want thumbnails, iPhone if you want full-size.
1 I tested on iOS 6.0.1 on an iPhone 4S, and 10.7.5 on my Mac.
Yes, iPhoto says there are duplicates because of the photo stream. But there IS a button to erase all remaining (not sychronized because of duplicates) photos from the iPhone directly within iPhoto after you did an import:
That does not solve your desire for an elegant wireless way. I simply think it's not possible to delete all photos at once directly from the iPhone (with built-in apps). Of course you could delete them by marking them one by one in the Photo apps using the "Edit"-Button.
Best Answer
I use the RedLaser app on my iPhone 3GS and it can handle just about every QR code that I've thrown at it. I would venture to say it would work even better with the higher resolution camera and enhanced image processing in the iPhone 4. Good lighting is probably going to be key.