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I want to display a thumbnail image in a cell of tableViewController, this thumbnail image is located at some remote place (URL of address is in XML file) so which format of image is cost effective?
It’s mostly the same as on the Web, really. For graphics, PNG is generally more efficient; for photos, you’ll want to pick JPEG.
I’m not sure whether the iPhone supports JPEG 2000 (OS X does), so that may be a more efficient options for photos.
Also consider tools such as
optipngandjpegtranto shed some additional kilobytes off your image data.