Re: - [NSBitmapImageRep tiffRepresentation] malloc error
Re: - [NSBitmapImageRep tiffRepresentation] malloc error
- Subject: Re: - [NSBitmapImageRep tiffRepresentation] malloc error
- From: Thomas Clement <email@hidden>
- Date: Fri, 12 Dec 2008 21:50:55 +0100
On Dec 12, 2008, at 9:29 PM, David Duncan wrote:
On Dec 12, 2008, at 3:51 AM, Thomas Clement wrote:
I'm using NSBitmapImageRep to build a new image by doing some pixel
processing (which unfortunately I can't do using Core Image).
Everything works great but with bigger sizes I'm getting a malloc
error when calling - [NSBitmapImageRep tiffRepresentation] (error
12: Can't allocate memory). I'm using this method at the end of my
processing to write the data to disk.
I guess I'm running out of memory and the allocation fails which is
rather surprising since I have plenty of disk space for virtual
memory.
How should I work around this problem?
How big are your images? You still only have 4GB of virtual address
space (and less actual and contiguous space) so if your using a
significant portion of it, then malloc()s for large chunks of memory
(like a method such as -TIFFRepresentation might require) are likely
to fail.
The image was 14340 x 14173 (8-bit RGB with no alpha).
Also I got these messages in the console:
kernel[0]: (default pager): [KERNEL]: no space in available paging
segments
malloc: *** mmap(size=1073741824) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
Attempt to allocate 1073741824 bytes for NS/CFData failed
What approach should I take to handle large images?
Thanks!
Thomas
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