Re: Image expands with compression
Re: Image expands with compression
- Subject: Re: Image expands with compression
- From: Marcel Weiher <email@hidden>
- Date: Sun, 9 May 2004 10:18:34 +0100
A note here: you generally don't want to decompress and recompress
JPEG images, as they will lose quality each time they are compressed.
So unless you are processing the image and want to save the changes,
you probably want to keep the original JPEG data around and re-save
that instead of recompressing the image data.
Marcel
On 9 May 2004, at 00:00, Scott Ahten wrote:
Lorenzo,
I think this is what your looking for...
http://www.cocoadev.com/index.pl?NSImageToJPEG
- Scott
On May 8, 2004, at 6:13 PM, Lorenzo wrote:
Hi,
I read a jpg file (76 KB only)
image = [[NSImage alloc] initWithContentsOfFile:filePath];
then I save it immediately with
[image TIFFRepresentationUsingCompression:
NSTIFFCompressionLZW factor:15.0];
and it grows to 812 KB !?!
Now as written in the header file "NSBitmapImageRep.h", the
NSTIFFCompressionJPEG compression is not longer supported.
So, how can I save my 76 KB image with a smart compression?
--
Marcel Weiher Metaobject Software Technologies
email@hidden www.metaobject.com
Metaprogramming for the Graphic Arts. HOM, IDEAs, MetaAd etc.
1d480c25f397c4786386135f8e8938e4
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