Re: NSTimer causes events to be lost
Re: NSTimer causes events to be lost
- Subject: Re: NSTimer causes events to be lost
- From: Johnny Deadman <email@hidden>
- Date: Mon, 21 Mar 2005 07:41:42 -0500
I'll just re-take responsibility for that original 'craps out'
statement. I still think that for general viewing on current
technology, the gains above 60 fps are marginal and most people
cannot reliably distinguish between 60 fps and anything higher...
however the visual difference between 25-30 fps and 60 fps is amazing
and a constant source of discussion between me and my cineaste
friends. Anyway, now off-topic, so thanks for the info.
On 21-Mar-05, at 2:47 AM, Peter Maurer wrote:
The human eye pretty much craps out at 60fps and 25fps is TV
quality...
I take issue with that last statement. I think that the
phosphors in displays crap out, not the eye. Personally I can
tell the difference between 60 fps and 75 fps quite easily, and
100 fps looks noticeably better to me as well. I've never seen
higher than 120 fps, but at that rate it really looks liquid.
Maybe it helps to be fully synchronized and frame-accurate as
well? :-}
[Sliding badly off list-topic, though of interest to anyone who
does animation or video generation or playback...]
The human eye can see certain features of pictures up to very high
frequency and it's certainly possible for most people to tell the
difference between 80Hz and 100Hz images if the image content is
of the right sort.
Moreover, Shaun might have confused the temporal frequency required
for (i) perceiving fluid motion from an apparent motion stimulus
(e.g., motion on your computer's display) with the one you need for
(ii) not perceiving flicker. Motion and flicker detection are
separate "channels" of visual processing.
<swank>Maurer, J.P. & Bach, M. (2003) Isolating motion responses in
visual evoked potentials by pre-adapting flicker-sensitive
mechanisms. Experimental Brain Research, 151, 536–541</swank>
In brief, 60 fps are highly sufficient to perceive fluid motion,
while CRT displays should indeed have higher frame rates.
--
John Brownlow
Deep Fried Films, Inc
http://www.johnbrownlow.com
http://www.pinkheadedbug.com
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden