I'm shooting in manual, JPEG, small image size and I've noticed that the picture looks very clear on the camera, but when I try to look at it on my phone, the clarity is lost. I've tried both transferring the DPI from 300 to 72 and then sending it by email and I've also sent the picture directly to my iPhone untouched and they always lose clarity. Any suggestions?
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Have you downloaded a picture to a computer screen and looked at it there? If it's clear on a computer screen at least you can be sure it's not the fault of the picture. It can be hard to evaluate an image on the camera's little screen.
I don't know how an iPhone processes images, but would suggest for starters that you use the largest and least compressed JPG file to start with, to minimize the cumulative compression. JPG images are re-computed and compressed every time they're resized.
I hope some iPhone expert can chime in here, as I suspect there may be an option for how the phone treats images. Some computer programs that convert to JPG have a choice of algorithms, and it makes a huge difference in quality.
http://jmp.sh/nxB0gHC
Note, by the way, that the sharper JPG is still considerably less sharp than the full sized image was, though it's not too bad. The viewer her has a zoom function, and if you zoom in on the right hand image, you will see the kind of artifacting that is typical of a low quality JPG save.