Decompressing JPEG data into specific format, getting raw pixels
Decompressing JPEG data into specific format, getting raw pixels
- Subject: Decompressing JPEG data into specific format, getting raw pixels
- From: "Sean McBride" <email@hidden>
- Date: Tue, 15 Aug 2017 12:23:58 -0400
- Organization: Rogue Research Inc.
Hi all,
I get some JPEG data from the network. I want to efficiently decompress this
data into a specific format (8 bit greyscale) and have an NSData of the raw
pixels. What's the best way to do this?
I'm currently using NSBitmapImageRep initWithData:, then testing if the result
is greyscale or RGB. If the latter, I write my own loop to convert to
greyscale.
But I'm hoping there is some lower level API available that I can tell
explicitly that I want greyscale...
Thanks,
--
____________________________________________________________
Sean McBride, B. Eng email@hidden
Rogue Research www.rogue-research.com
Mac Software Developer Montréal, Québec, Canada
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