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macOS preparing assets: which file format appropriate for 160ppi?

T

technekai

macrumors newbie
Original poster
Feb 28, 2008
20
0
i am preparing assets for an iPhone app built with the SDK. in which format should i save the images, in order to take advantage of the iPhone screen resolution of 160ppi? native Photoshop format is not an option, my programmer does not have it.

TIFF at 160ppi?

thank you for your advice,
aya.
 
N

Nutter

macrumors 6502
Mar 31, 2005
432
0
London, England
PNG is the recommended format.

You should save your images at 72dpi if you want one pixel in the image to correspond to one pixel on the iPhone.
 
HiRez

HiRez

macrumors 603
Jan 6, 2004
6,250
2,576
Western US
I find that PNG generally has better compression than TIF, I only use TIF when I need multiple alpha channels or layers. For graphics productions I also recommend rendering intermediate QuickTime movies using the QuickTime PNG rather than the Animation codec.
 
N

Nutter

macrumors 6502
Mar 31, 2005
432
0
London, England
Xcode also performs additional (non-lossy) compression on PNGs at compile time, and iPhone OS apparently has an optimised pathway for PNG decompression, so it's a winner all round.
 
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