Want to buy a phone for camera..

Started Aug 8, 2013 | Questions thread
Jeff Peterman
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Re: iPhone and file formats
In reply to Alupang, Aug 10, 2013

OK, let's say I take a photo with an app - it will have gone through one round of JPG compression. Then:

1. I adjust the brightness and save the file.

2. Later, I open the brightness-adjusted file, crop the image, and save it under a new name.

3. Later, I open the cropped image and adjust the color saturation and save it.

If each save was done with a loss-less format, such as TIF, I'll only have the initial JPG compression artifacts. But if I saved as JPG each time, I'd have at least two extra cycles of JPG compression, which would degrade the image.

Personally, I'd avoid most of the above by just saving the image initially on the phone and then moving it to my PC to edit in PhotoShop. BUT, if you're going to do multiple edit cycles on a phone/tablet then saving as TIF is an advantage - assuming you have enough space (at 20 MB per image, you need a lot of memory if you often edit on the device).

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