The Apple iPhone 4 has a 5 megapixel camera capable of taking photos at up to 2592 x 1936 pixels. There is a LED flash too, which may even make some difference given the back-illuminated camera sensor.
The camera has both autofocus and touch AF, which are fast and quite accurate. The latter even tracks moving subjects.
The camera user interface is neat and simple Ė the only controls are a shutter/rec key, flash settings and a small thumbnail in the corner that shows the last photo taken. Oh, and there is a switch to toggle between the main and the front-facing camera.
The image quality is the best the iPhones have pulled off. Color rendering is quite nice though oversaturated and in broad daylight thereís plenty of resolved detail. So overall you get sharp and vibrant images.
The grainy effect of the high noise levels we saw back the 3GS photos is still visible on the iPhone 4 samples too but only when you preview the shots at 100% magnifications.Thereís no sign of chroma noise, it just seems that Apple R&D prefers that untouched grainy look that is more sparing on the fine detail. Otherwise they could have wiped it clean with some noise suppression.
We never though we'd say that for, but resolution-wise, the iPhone 4 camera is among the best performing 5 megapixel cameraphones out there.
We also noticed the field-of-view is bit narrower than we would have liked. We estimated it at being somewhere around 38mm in regular 35mm equivalent. Now thatís a lot, especially when there are already phones with 28mm wide angle lenses.
Back illuminated sensors such as the one on the iPhone 4 usually deal better with noise in darker scenes so we were curious to see the high ISO performance. For this test we used Samsung Galaxy S for comparison.
As you can see, the iPhone 4 samples get quite noisy and the slightly oversaturated colors suffer the most. Again, the reason for that is Appleís laid-back approach in noise suppression.
Samsung R&D has applied a more conventional technique Ė the higher the ISO, the higher the noise-suppression. As a consequence, the Samsung Galaxy S looks a lot smoother at ISO400 but it lacks some of the fine detail.
At this point we canít really see a tangible advantage of the back-illuminated sensor of the iPhone 4, but we also canít call the Galaxy S photos that good. Both processing techniques make compromises, itís just that youíd have to pick which compromise bothers you less.
Weíve also added the Apple iPhone 4 to the database of our Photo Compare Tool. You can see how the Apple iPhone 4 image quality compares to that of some of the other handsets we have reviewed. Clicking any of the following three images will take you to our dedicated page for some pixel-peeping pleasure.
The iPhone 4 records video in 720p resolution at 30 fps. Thatís quite something as an upgrade to the 3GS. Clips are stored in .MOV format. The big letdown is the lack of a video resolution setting. Weíre not even gonna mention SloMo or Time Lapse videos. Weíre talking about giving the user the simple choice between HD and VGA.
Anyway, the actual video quality is quite good though. The framerate is very consistent. Perhaps the iPhone 4 could use some sort of digital image stabilization to keep handshake under control, but we suppose itís too much to ask.
Video clips are only accessible from the gallery. They can be sent over email, MMS or directly uploaded on YouTube. Here is an untouched 720p video sample for you to check out.
Here are two 720p video samples uploaded to YouTube:
The recorded clips can also be trimmed straight on the phone. Itís as basic as it gets: a thumbable filmstrip for you to set the start and end of the trim. You can quickly preview the part of the clip youíre about to trim. But the best thing is you can overwrite your current clip or save it as a new one (the iPhone OS 3 didnít give you a choice).
You can edit movies with iMovie too, but itís a paid app exclusively available for the iPhone 4.
The Apple iPhone 4 was also included in our Video Compare Tool database. Check it out Ė the toolís page includes a quick walkthrough on how to use it and what to look for.