Re: CIImage slower than NSImage?
Re: CIImage slower than NSImage?
- Subject: Re: CIImage slower than NSImage?
- From: Kenny Leung <email@hidden>
- Date: Tue, 22 Nov 2005 11:00:54 -0800
That's a good suggestion. I'll try it.
Thanks!
-Kenny
On Nov 22, 2005, at 10:46 AM, Jonathan Wight wrote:
Also, are you creating your filter each time you manipulate your
image?
I've found that creating filters can be rather expensive and
something you should do as little as possible. It is best to create
your filters once and just set their attributes when needed.
Jon.
On Nov 22, 2005, at 13:37, John Stiles wrote:
Is it possible that you're running your CoreImage tests on a Mac
which doesn't have a CoreImage-compatible GPU?
The "compatibility" path for CoreImage uses the software OpenGL
renderer; in honesty, it's kind of amazing that it works as fast
as it does, but it's not going to be as fast as a custom hand-
rolled routine that does scaling/rotation.
On Nov 22, 2005, at 9:54 AM, Kenny Leung wrote:
Also, the 128-bit floating point version of an image performs
better than the 32-bit integer version!
-Kenny
On Nov 22, 2005, at 9:27 AM, Milton Sagen wrote:
I can't shed any light on it, but I found this to be true of
scaling also, by about a factor of three. However, that was on
the original PB 17". I haven't tried it on a newer machine with
a newer graphics card. Maybe that's where the problem lies. Then
again maybe CoreImage is at this point in time simply slower for
these relatively simple operations and its power lies elsewhere.
Milt
On Nov 22, 2005, at 09:00, Kenny Leung wrote:
Hi All.
I am using CoreImage in my application, and I'm finding that
geometric operations, particularly rotation, are much slower
with CIImage than NSImage. In fact, rotating an NSImage causes
no noticeable slowdown while rotating a CIImage causes a very
noticeable slowdown.
Also, applying a transform to a CIImage as a filter yields
different results than when the transform is applied to the
current graphics context.
Can someone shed some light on this?
Thanks!
-Kenny
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