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From: Andrew Cocker
Subject: Re: Overexposed? Post Processing of POV images.
Date: 20 Apr 2002 18:26:40
Message: <3cc1eb20$1@news.povray.org>
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"Slime" <noo### [at] hotmail com> wrote in message
news:3cc1cb2c$1@news.povray.org...
> You could just multiply the color of all your light sources and the
> ambient_light value in the global_settings by however much you wanted to
> overexpose.
Thanks. Will experiment.
Andy
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In Photoshop:
Duplicate layer as bloom. Use treshold or levels to clip
non-overexposed parts to black. Set layer mode to screen.
Gaussian blur. Adjust layer opacity and/or levels.
A variation of this can be used to get nice colored halos
to white or colored overexposed areas. Make a copy of bloom
layer and colorize it to dark saturated color, blur more.
Another copy is colorized lighter and different hue and less
saturated, blur less.
If PSP has macros this can be automated.
_____________
Kari Kivisalo
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From: Andrew Cocker
Subject: Re: Overexposed? Post Processing of POV images.
Date: 21 Apr 2002 10:05:50
Message: <3cc2c73e@news.povray.org>
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"Jan Walzer" <jan### [at] lzernet> wrote in message
news:3cc1d82a@news.povray.org...
> I got some nice results the following way:
>
> -Use your favourite layer-supporting paintprog
> -duplicate the image in another layer
> -set method of lighten-only
>
> -use a gaussian-blur filter on the duplicated layer
> -probably you have to adjust brightness/contrast
>
> maybe it's better to adjust the brightness/contrast
> before blurring, but you have to experiment a bit yourself ...
Thanks Jan, that works a treat.
Andy
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From: Andrew Cocker
Subject: Re: Overexposed? Post Processing of POV images.
Date: 21 Apr 2002 10:06:47
Message: <3cc2c777@news.povray.org>
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Thank you Kari.
Andy
"Kari Kivisalo" <pro### [at] luxlabcom> wrote in message
news:3CC2A932.32598DE7@luxlab.com...
>
> In Photoshop:
>
> Duplicate layer as bloom. Use treshold or levels to clip
> non-overexposed parts to black. Set layer mode to screen.
> Gaussian blur. Adjust layer opacity and/or levels.
>
> A variation of this can be used to get nice colored halos
> to white or colored overexposed areas. Make a copy of bloom
> layer and colorize it to dark saturated color, blur more.
> Another copy is colorized lighter and different hue and less
> saturated, blur less.
>
> If PSP has macros this can be automated.
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In article <3cc1bf43@news.povray.org>,
"Andrew Cocker" <big### [at] mariner9fsnetcouk> wrote:
> Does anybody know how I can achieve the 'overexposed' glow that occurs on
> bright white areas of an image? Any tutorials you know of? I don't have
> Photoshop, but I do have Paint Shop Pro 7. A batch processing solution would
> be even better.
Use the "glow" post process filter in MegaPOV?
--
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/
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From: Jan Walzer
Subject: Re: Overexposed? Post Processing of POV images.
Date: 21 Apr 2002 13:35:23
Message: <3cc2f85b@news.povray.org>
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"Christopher James Huff" <chr### [at] maccom> wrote:
> Use the "glow" post process filter in MegaPOV?
thats too simple
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what he probably meant is, that there is
also a glow-postprocess option in Megapov
please check the docs ...
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From: Andrew Cocker
Subject: Re: Overexposed? Post Processing of POV images.
Date: 22 Apr 2002 17:58:36
Message: <3cc4878c@news.povray.org>
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"Jan Walzer" <jan### [at] lzernet> wrote in message
news:3cc426af$1@news.povray.org...
> what he probably meant is, that there is
> also a glow-postprocess option in Megapov
>
> please check the docs ...
Ah yes, so there is.. my mistake. It's been a long time since I used
MegaPOV, and I had forgotten about it.
Andy
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From: Alan Holding
Subject: Re: Overexposed? Post Processing of POV images.
Date: 23 Apr 2002 04:10:29
Message: <3cc516f5@news.povray.org>
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"Andrew Cocker" <big### [at] mariner9fsnetcouk> wrote in message
news:3cc1bf43@news.povray.org...
> Does anybody know how I can achieve the 'overexposed' glow that occurs on
> bright white areas of an image? Any tutorials you know of? I don't have
> Photoshop, but I do have Paint Shop Pro 7. A batch processing solution
would
> be even better.
A super simple solution:
Duplicate the original layer. Set the duplicated layer's mode to Dodge and
adjust it's opacity to fit.
Bit more involved:
Duplicate the original layer. In PSP 7, go to Effects > Edge > Dilate.
Then Effects > Blur > Gaussian Blur of about 7. Then set the duplicated
layer's mode to Screen or Dodge and adjust the opacity to fit.
As far as I know, you need Image Robot to do batch image processing work in
PSP. You might want to try and use IrfanView (www.irfanview.com). It has
batch processing, but only rudimentary image processing functions, such as
Brightness, Gamma, Contrast, etc.
Alan.
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From: Andrew Cocker
Subject: Re: Overexposed? Post Processing of POV images.
Date: 23 Apr 2002 13:08:25
Message: <3cc59509$1@news.povray.org>
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Ok, thanks all for suggestions. I used Alan's recent suggestion as I read
his post shortly before attempting the image manipulation, and I got
beautiful results by modifying the curve of the duplicated layer to clip
away all dark areas (thanks Kari), and then performing the layer adjustments
as per Alan's suggestion.
Unfortunately I cannot automate this process, as Image Robot (which I have)
cannot work with layers :-(.
I shall be posting an animation very shortly which will demonstrate this
glow effect perfectly... watch this space.
All the best,
Andy Cocker
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