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From: Kari Kivisalo
Subject: curves post process input clipped (mp0.7)
Date: 31 May 2001 00:09:06
Message: <3B15C461.7256CCA8@x.x>
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post_process {
curves {
all
spline {
linear_spline
0,0
10,1
}
This should linearly compress input range 0-10 to 0-1 but max output
is at 0.1. I remember post process stage used unclipped floats but
seem like it's not the case.
_____________
Kari Kivisalo
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From: Kari Kivisalo
Subject: Re: curves post process input clipped (mp0.7)
Date: 31 May 2001 00:56:17
Message: <3B15CF70.38284A28@x.x>
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Also found out: curves input uses integer, gamma correction is applied
before curves. I tried to do some compression experiments but as such
curves can't be used because of clipping and bit resolution. Misplaced
gamma correction isn't a problem because it can be turned off and applied
to the file.
_____________
Kari Kivisalo
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In article <3B15C461.7256CCA8@x.x>, Kari Kivisalo <x@x.x> wrote:
> I remember post process stage used unclipped floats but seem like
> it's not the case.
The post-processed image starts with clipped colors, you need to use the
raw_image post_process to get the unclipped colors before using the
curves filter.
--
Christopher James Huff - chr### [at] mac com, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
<><
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In article <3B15CF70.38284A28@x.x>, Kari Kivisalo <x@x.x> wrote:
> Also found out: curves input uses integer,
Um, no it doesn't.
> gamma correction is applied before curves.
Gamma correction is done separately from post-processing...but it should
probably be done afterwards, it might be considered a bug. A gamma
correction of 1 won't do anything, though...so you could do it with
post-process filters instead.
--
Christopher James Huff - chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
<><
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