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 12:02:44 -0800
You're right! Now I feel like a dope. My PowerBook has an ATI
Mobility Radeon 9600, which is not on Apple's CoreImage page. (The
regular 9600 is) I just tried it on another PowerBook with an nVidia
GeForce Go 5200, and performance is similar.
I did find, however, that you must use the CIContext API for the
final drawing. If you use the AppKit convenience API and transform
the current graphics context, you get even slower behaviour.
Thanks!
-Kenny
On Nov 22, 2005, at 11:11 AM, John Stiles wrote:
Um, honestly I wouldn't be so sure. What GPU does it have?
On Nov 22, 2005, at 11:00 AM, Kenny Leung wrote:
I have an original 15" aluminum powerbook. I'm pretty sure it's
CoreImage compatible.
-Kenny
On Nov 22, 2005, at 10:37 AM, 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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