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From: Greg M Johnson
Subject: Image editor skews colors of rendered image
Date: 13 Apr 2004 21:58:03
Message: <407c9aab@news.povray.org>
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I originally posted this as a povray problem in p.n.-u.
Perhaps it's a problem with my image editor.
I rendered an image in povray-- note a torquoise shade to the blues. I
then loaded it up in CorelPhotoPaint-- note navy blues. I then loaded up the
image in Windows Picture and Fax Viewer-- torquoise.
Any tips?
Post a reply to this message
Attachments:
Download 'newhouseII 169b.jpg' (78 KB)
Preview of image 'newhouseII 169b.jpg'
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From: Francois Labreque
Subject: Re: Image editor skews colors of rendered image
Date: 13 Apr 2004 22:04:07
Message: <407c9c17$1@news.povray.org>
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Program ended abnormally on 13/04/2004 21:58, Due to a catastrophic Greg M.
Johnson error:
> I originally posted this as a povray problem in p.n.-u.
>
> Perhaps it's a problem with my image editor.
>
>
> I rendered an image in povray-- note a torquoise shade to the blues. I
> then loaded it up in CorelPhotoPaint-- note navy blues. I then loaded up the
> image in Windows Picture and Fax Viewer-- torquoise.
>
> Any tips?
>
Gamma correction?
--
/*Francois Labreque*/#local a=x+y;#local b=x+a;#local c=a+b;#macro P(F//
/* flabreque */L)polygon{5,F,F+z,L+z,L,F pigment{rgb 9}}#end union
/* @ */{P(0,a)P(a,b)P(b,c)P(2*a,2*b)P(2*b,b+c)P(b+c,<2,3>)
/* videotron.ca */}camera{orthographic location<6,1.25,-6>look_at a }
Post a reply to this message
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From: Greg M Johnson
Subject: Re: Image editor skews colors of rendered image
Date: 13 Apr 2004 22:08:33
Message: <407c9d21$1@news.povray.org>
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"Francois Labreque" <fla### [at] videotron ca> wrote in message
news:407c9c17$1@news.povray.org...
>
> Gamma correction?
>
Uh, please elaborate, assuming I'm a complete idiot.
Post a reply to this message
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Greg M. Johnson wrote:
> "Francois Labreque" <fla### [at] videotronca> wrote in message
> news:407c9c17$1@news.povray.org...
>
>>Gamma correction?
>>
> Uh, please elaborate, assuming I'm a complete idiot.
Make sure one of the two pictures is not converted to or from CMYK. RGB
mode can represent more colors than CMYK and the blues are the shades
that typically suffer. When a color is in RGB but not in CMYK, it is
called "Out of Gamut".
--
Respectfully,
Dan P
http://<broken link>
Post a reply to this message
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From: Greg M Johnson
Subject: Re: Image editor skews colors of rendered image
Date: 13 Apr 2004 22:45:31
Message: <407ca5cb$1@news.povray.org>
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"Dan P" <dan### [at] yahoocom> wrote in message
news:407ca2e7$1@news.povray.org...
>
> Make sure one of the two pictures is not converted to or from CMYK. RGB
> mode can represent more colors than CMYK and the blues are the shades
> that typically suffer. When a color is in RGB but not in CMYK, it is
> called "Out of Gamut".
>
Windows Explorer says it's 24 bit, Corel says it's (24 bit RGB).
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From: Francois Labreque
Subject: Re: Image editor skews colors of rendered image
Date: 13 Apr 2004 23:18:31
Message: <407cad87$1@news.povray.org>
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Program ended abnormally on 13/04/2004 22:08, Due to a catastrophic Greg M.
Johnson error:
> "Francois Labreque" <fla### [at] videotronca> wrote in message
> news:407c9c17$1@news.povray.org...
>
>>Gamma correction?
>>
>
>
>
> Uh, please elaborate, assuming I'm a complete idiot.
http://www.povray.org/documentation/view/216/
I'm sure that the resident lighting gurus would be better than I am to explain
the reasons why, but basically, many monitors do not display colors the same way
so an image that looks fine on your monitor could look too dark on a laptop or
mac. POV has two settings to make sure that the files look the same to everyone:
assumed_gamma (takes color correction into account when rendering the file. That
value is saved in .png and .tga files, but not .jpg or .bmp - try changing the
output format of your image to see if they come out differently.)
display_gamma (will correct the colors so that they look good on *your* monitor).
My guess is that the other softwares you used had different values for gamma
correction (or none) and that's why your seeing the different colors.
P.S.: I've never had the chance to tell you, but I love your photo in
Bluepages. ;-)
--
/*Francois Labreque*/#local a=x+y;#local b=x+a;#local c=a+b;#macro P(F//
/* flabreque */L)polygon{5,F,F+z,L+z,L,F pigment{rgb 9}}#end union
/* @ */{P(0,a)P(a,b)P(b,c)P(2*a,2*b)P(2*b,b+c)P(b+c,<2,3>)
/* videotron.ca */}camera{orthographic location<6,1.25,-6>look_at a }
Post a reply to this message
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Most painting programs will display an image in the true RGB values, the same as
pov, but it's possible that your image editor is set to display images with
gamma correction. Have a look through the options in your program, there should
be something there.
Or just use a simpler image editor! I know for a fact the GIMP, Paintshop Pro,
and many other programs display images in the same colours that are used in the
file without any automatic gamma correction.
Incidentally, although the pov docs give a really good description of what gamma
correction is, your problem is definitely to do with your image viewer, not
povray. So you don't need to change your scene at all.
--
Tek
www.evilsuperbrain.com
"Greg M. Johnson" <gregj;-)565### [at] aolcom> wrote in message
news:407c9d21$1@news.povray.org...
>
> "Francois Labreque" <fla### [at] videotronca> wrote in message
> news:407c9c17$1@news.povray.org...
> >
> > Gamma correction?
> >
>
>
> Uh, please elaborate, assuming I'm a complete idiot.
>
>
>
Post a reply to this message
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Tek wrote:
<snip:technical />
> Incidentally, although the pov docs give a really good description of what gamma
> correction is, your problem is definitely to do with your image viewer, not
> povray. So you don't need to change your scene at all.
I agree with Tek here -- POV-Ray isn't going to be the problem.
It has to be the viewer.
Are you using Photoshop?
If so, try this:
(This is for PS 7 -- might be different for other versions, but the idea
is the same):
Menu: Edit > Color Settings
Settings pull-down: Color Management Off
Click [OK]
--
Respectfully,
Dan P
http://<broken link>
Post a reply to this message
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Dan P wrote:
> Tek wrote:
>
> (This is for PS 7 -- might be different for other versions, but the idea
> is the same):
Okay, I'm an idiot -- I just realized you said you were using Corel.
I've never used Corel -- maybe there is something similar?
--
Respectfully,
Dan P
http://<broken link>
Post a reply to this message
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From: John D Gwinner
Subject: Re: Image editor skews colors of rendered image
Date: 14 Apr 2004 00:34:31
Message: <407cbf57$1@news.povray.org>
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It's not gamma, it's "Correcting" the colors for your chosen output device
(which turns out you didn't choose <G>)
The default is some line printer you're never going to output to, and it
does noticably change the color.
Corel is RABID about "Correcting" your colors.
Go into your Color Profiles, and DELETE everything.
I had the same problem, deleted all the color profiles, now I'm fine.
Let me know if you can't find the setting.
== John ==
"Greg M. Johnson" <gregj;-)565### [at] aolcom> wrote in message
news:407c9aab@news.povray.org...
> I originally posted this as a povray problem in p.n.-u.
>
> Perhaps it's a problem with my image editor.
>
>
> I rendered an image in povray-- note a torquoise shade to the blues. I
> then loaded it up in CorelPhotoPaint-- note navy blues. I then loaded up
the
> image in Windows Picture and Fax Viewer-- torquoise.
>
> Any tips?
>
>
>
Post a reply to this message
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