I've actually put my iPhone inside my enlarger resting on the negative stage and printed an image from the screen onto Ilford Multigrade RC - lots of pixelation, very flat image - even with highest contrast filters. This was using the 3G with the smaller resolution screen. Now have the 4S, but I think the problem would be the same, even making 3 inch prints at the native 960 x 640. I did have an idea to make a larger 'mosaic' with thumbnail sized prints from the screen, but just wasn't happy with the results.
We don't see the pixels when we're looking at the phone display because our eyes tend to concentrate on the surface of the retina display, which actually softens the image and acts as a filter, but when focusing on the screen as a 'film plane' with the enlarger or film back, the pixels themselves (below the retina display) need to be in focus for the image to appear sharp.
In short, the retina display tricks our eyes into believing the image on screen is better than it is, but it doesn't trick optics which have to see through the screen to focus on the image/pixels..
There is no trick or magic about the retina displays - it's just that the pixels on the display are small enough that the eye can't resolve the individual pixels. Blow the image up to a larger size (with an enlarger or whatever), and the eye is able to resolve the individual pixels.
Interesting idea. I've started a thread on DPUG.org about it--
http://www.dpug.org/forums/f21/smartphone-your-enlarger-3012/#post22050
Which is why the anti-aliasing effect of the iPhone camera processing isn't as apparent as it is on a computer screen.
Done!
Dead Link Removed
What about a smartphone back for my film camera ?.
What about a smartphone back for my film camera ?.
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