Using CGImage to generate a low quality JPG from data?

Question

I have some code which loads a jpg from data and displays it in a UIImageView. Because this takes a second, I want to load a lower quality version of the image and display that while the full image is loading. Is this possible?

score 3 · Accepted Answer · edited May 23 '17 at 10:24

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You should have a look at Image I/O

It lets you create a thumbnail from a source image and supports retrieving a thumbnail that may be embedded within the source image. JPG images often have a low quality thumbnail embedded within them.

Also, if loading the image is blocking your app, you should consider doing it on a background thread: load uiimage from file using grand central dispatch

edited May 23 '17 at 10:24

Community

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answered Oct 24 '12 at 03:38

EarlyRiser

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I am loading in the background, i just want something to show the user in the mean time. Thanks. – Andrew Oct 24 '12 at 03:43

Using CGImage to generate a low quality JPG from data?

1 Answers1