Re: Solarize in Gimp
Kropemann
> Hi all
>
> Can someone tell me how to do the solarize effect in this tutorial.
>
> <http://webdeveloper.com/design/design_oil_effect.html>
Try filters->distorts->wind for a similar effect. Unfortunately you'll
have to turn the image first 90°
>
> I thought I had a tutorial on solarize for gimp but I cannot find it now,
> so am not sure if it is only in my imagination :-).
>
> I have gimp 2.2.9 and 2.3.5 on Fedora Core 4.
>
> Thank you.
>
Frederico Mameri
> Can someone tell me how to do the solarize effect in this tutorial.
Well, I looked everywhere but I couldn't find any information on how to
do solarization in GIMP itself.
However, I *am* going to propose you a solution (even though it's not a
very elegant one).
The command-line tool "mogrify" has a solarization filter. "mogrify" is
part of the GNU GPL-licensed ImageMagick suite.
(http://www.imagemagick.org/)
-=-
From the man page ImageMagick (1):
-solarize <factor>
negate all pixels above the threshold level
Specify factor as the percent threshold of the intensity (0 - 99.9%).
This option produces a solarization effect seen when exposing a
photographic film to light during the development process.
-=-
So I guess you could save the layer you want to apply the solarize
effect, open a terminal, invoke something like "mogrify -solarize 50"
and re-import the result into your image in GIMP. (I haven't tested it
myself, but it should work with no further problems).
Again, it is not an elegant solution at all and if anybody knows a
better, more elegant, GIMP-based solution, please let us know.
Hope it helps!
--
Frederico Mameri
fmameri at free dot fr
http://fmameri.free.fr
Linux Registered User #333496
Resist Tyranny: Firefox & Thunderbird
Frederico Mameri
>>So I guess you could save the layer you want to apply the solarize
>>effect, open a terminal, invoke something like "mogrify -solarize 50"
>>and re-import the result into your image in GIMP. (I haven't tested it
>>myself, but it should work with no further problems).
>
> properly, might be just me though.
Lin,
Well, excuse me. It seems it was my fault after all. In fact, you should
invoke mogrify like this:
"mogrify -solarize 50% <your-image>"
In fact, man page says it shoud be a number between 0 and 99.9% (note
the % sign).
After I mogrified the image file I had previously exported from a layer,
I re-opened it as a new one. That way, I pretty much suceeded in
creating an image file pretty much the same as the 4th one in the web
site you indicated.
However, I *am* having trouble with the black body part (from the 4th to
the 5th image). (For a bit of theory on black body, see
http://en.wikipedia.org/wiki/Blackbody). The closest to it I got was by
using the Reds palette. But not quite there.
Maybe some of the guys out there could help us figure out how to achieve
this effect using the GIMP.
Frederico Mameri
> Although it is not perfect, I changed mode to RGB and then used
> colorise using hue, saturation and lightness to get a good result, which
> is a workaround.
Yep, kinda worked. Thanks. I'll keep on looking and if you find out
something, please let us know.
Dirk Hartmann
> Lin wrote:
>> Although it is not perfect, I changed mode to RGB and then used
>> colorise using hue, saturation and lightness to get a good result, which
>> is a workaround.
>
> Yep, kinda worked. Thanks. I'll keep on looking and if you find out
> something, please let us know.
>
Hello,
no blind tries, remember chemical fim: the so called pseudo solarisation
means, that the mid range of the tonal values tilt. Do the same with the
Gimp 2.2 "Layers - Color - Curves" (got a german version but the path
should be like this). Drag the curve on the left and right side to the half
of the window like this:
------------
| |
------------
| |
-------------
Then pull the curve down in the middle like this:
---------
| |
\ /
\ /
-----------
And voila you got a perfect simulation of a pseudo solarisation
Cheers
--
Dirk Hartmann
blangis...@gmx.de
Remove _nospam from my mail adress because of spam protection
Frederico Mameri
> Hello,
> no blind tries, remember chemical fim: the so called pseudo solarisation
> means, that the mid range of the tonal values tilt. Do the same with the
> Gimp 2.2 "Layers - Color - Curves" (got a german version but the path
> should be like this). Drag the curve on the left and right side to the half
> of the window like this:
> ------------
> | |
> ------------
> | |
> -------------
>
> Then pull the curve down in the middle like this:
> ---------
> | |
> \ /
> \ /
> -----------
>
> And voila you got a perfect simulation of a pseudo solarisation
Well, yeah.. it kinda works (the results are not exactly the same,
though). How about that blackbody effect? Any clues??
Thanks,
Dirk Hartmann
> Dirk Hartmann wrote:
>> Hello,
>> no blind tries, remember chemical fim: the so called pseudo solarisation
>> means, that the mid range of the tonal values tilt. Do the same with the
>> Gimp 2.2 "Layers - Color - Curves" (got a german version but the path
>> should be like this). Drag the curve on the left and right side to the
>> half of the window like this:
>> ------------
>> | |
>> ------------
>> | |
>> -------------
>>
>> Then pull the curve down in the middle like this:
>> ---------
>> | |
>> \ /
>> \ /
>> -----------
>>
>> And voila you got a perfect simulation of a pseudo solarisation
>
> Well, yeah.. it kinda works (the results are not exactly the same,
> though). How about that blackbody effect? Any clues??
>
> Thanks,
>
Not sure what you mean. Regarding to my poor english you try to heat a
theoretically platin sphere and what comes out of this "black body" has a
certain color temperature (this is the model of a "black body" and
indicates the degree measured in Kelvin of a certain color temperature in
morning, noon or tungsten light). So the picure is afterwards more redish
or blueish. Is this what you wanna do?
--
Dirk Hartmann