Just to show off. ;-)


-- 
Thomas

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On 5-3-2018 10:05, Thomas de Groot wrote:
> Just to show off. ;-)
> 

again...


-- 
Thomas

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On 05/03/2018 09:11, Thomas de Groot wrote:
> On 5-3-2018 10:05, Thomas de Groot wrote:
>> Just to show off. ;-)
>>
> 
> again...
> 
> 

I like this one. :-)

Has anyone tried to produce a solarisation effect?

-- 

Regards
     Stephen

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On 3/2/2018 10:27 AM, And wrote:
> Use some codes to modify photos.
> 
> 
> 
> #declare p_modify1 =
> pigment{
>      pigment_pattern{p_original}
>      pigment_map{
>      #for(i,0,255)
>          [i/255,
>          bumps
>          scale 1/input_wide_res
>          scale 4.8
>          rotate <0,0,20>
>              color_map{
>              [0.2+0.6*(1-pow(i/255,1/3)) rgbt<0,0,0,0.1>]
>              [0.2+0.6*(1-pow(i/255,1/3)) rgbt<0,0,0,0.9>]
>              }
>          ]
>      #end
>      }
> }
> 
> 
> 
> 


I needed such a "half-tone" effect for something or other in the past. I 
wish I could remember what.


Mike

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Thomas de Groot <tho### [at] degrootorg> wrote:
> Just to show off. ;-)
>
>
> --
> Thomas

This two are dazzling.

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On 5-3-2018 8:40, Thomas de Groot wrote:
> On 4-3-2018 15:51, Kenneth wrote:
>> Thomas de Groot <tho### [at] degrootorg> wrote:
>>
>>>>>
>>>>> It is a bit like your airbrush.
>>>>>
>>>>> -- 
>>>>> Thomas
>>>>
>>>> I'd like to see.
>>>>
>>>
>>>
http://news.povray.org/povray.binaries.images/thread/%3C48295282%40news.povray.org%3E/

>>>
>>>
>>

> 
> :-)
> 
>>
>> BTW, re: the discussion there of 'bending the slopes of 
>> height_fields': It can
>> be done in an alternate way now, using POV-Ray's 'blend gamma' 
>> feature-- i.e.,
>> by purposely changing the gamma of the image that's used to make the 
>> HF. That
>> effectively changes the otherwise 'linear' slope of HF contours to 
>> more of a
>> curve. For example, HF mountains made this way look more natural to my 
>> eye--
>> like the mountain's slopes have naturally eroded. (There's also a HF 
>> difference
>> between images SAVED at different gamma values, for the same reason-- 
>> 1.0 being
>> a linear slope, 2.2 being more of a curve.)
>>
> 
> Indeed. That is something I never really used purposefully but which you 
> do well to remind me of. Thanks!
> 
> I shall make a small test scene. A way for me to remember stuff.
> 

Like this. Left, image gamma is 1.0; right, image gamma is 2.2.

-- 
Thomas

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Preview of image 'hf_test_image gamma.png'

This is a great tool - one that is obvious in retrospect, but I had never
thought of.

It's great that it's possible to save an image with a certain gamma and then use
it as a height field, but the obvious question that affects the real utility of
this is:

Is it possible to READ the existing, non-gamma modified image in using a certain
gamma value for use in a height field?

So, for example, use TdG's gamma 1.0 image to generate his gamma 2.2 height
field?

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Am 05.03.2018 um 14:27 schrieb Bald Eagle:
> This is a great tool - one that is obvious in retrospect, but I had never
> thought of.
> 
> It's great that it's possible to save an image with a certain gamma and then use
> it as a height field, but the obvious question that affects the real utility of
> this is:
> 
> Is it possible to READ the existing, non-gamma modified image in using a certain
> gamma value for use in a height field?
> 
> So, for example, use TdG's gamma 1.0 image to generate his gamma 2.2 height
> field?

Well, yes, absolutely: In the height field, just specify "gamma FLOAT"
after the image file name.

I think you need to specify "gamma 1/2.2" for the intended effect.

There may be slight differences due to different rounding, but other
than that it should work just fine.

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Stephen <mca### [at] aolcom> wrote:

> Has anyone tried to produce a solarisation effect?

Hi,
with a simple approach I got this image - here is the code

// render with image resolution and No AA. Method is very memory intensive for
large image sizes!

#version 3.7;

global_settings {
        assumed_gamma 1
}

#include "stdinc.inc"

camera {
        orthographic
        location <0,0,-2>
        look_at 0
        right x*image_width
        up y*image_height
}

#declare image_width_Old = image_width;
#declare image_ratio = image_width/image_height;
#declare image_height_Old = image_width_Old/image_ratio;

#declare pig_map =
function {
        pigment {
                image_map {jpeg "glasses" gamma 2.2}
                scale <image_width_Old,image_height_Old,1>
        }
}

#declare nx = 0;
#while (nx < image_width)
        #declare ny = 0;
        #while (ny < image_height)
                #declare paint_pig = pig_map (nx+0.5,ny+0.5,0);
                box {
                        0, 1
                        pigment {color srgb <max (paint_pig.x,
1-paint_pig.x),max (paint_pig.y, 1-paint_pig.y),max (paint_pig.z,
1-paint_pig.z)>*2-1}
                        finish {emission 1 diffuse 0}
                        translate <nx-image_width*0.5,ny-image_height*0.5,0>
                }
                #declare ny = ny+1;
        #end
        #declare nx = nx+1;
        #debug concat (str (nx/image_width*100, 0, 1)," % processed \n")
#end


Norbert

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Attachments:
Download 'glasses solarized.jpg' (359 KB)

Preview of image 'glasses solarized.jpg'

On 05/03/2018 15:13, Norbert Kern wrote:
> Stephen <mca### [at] aolcom> wrote:
> 
>> Has anyone tried to produce a solarisation effect?
> 
> Hi,
> with a simple approach I got this image - here is the code
> 

Oo! shiny. I like.

You are on a roll, Norbert. :-)


> // render with image resolution and No AA. Method is very memory intensive for
> large image sizes!
> 
> #version 3.7;
> 
> global_settings {
>          assumed_gamma 1
> }
> 
> #include "stdinc.inc"
> 
> camera {
>          orthographic
>          location <0,0,-2>
>          look_at 0
>          right x*image_width
>          up y*image_height
> }
> 
> #declare image_width_Old = image_width;
> #declare image_ratio = image_width/image_height;
> #declare image_height_Old = image_width_Old/image_ratio;
> 
> #declare pig_map =
> function {
>          pigment {
>                  image_map {jpeg "glasses" gamma 2.2}
>                  scale <image_width_Old,image_height_Old,1>
>          }
> }
> 
> #declare nx = 0;
> #while (nx < image_width)
>          #declare ny = 0;
>          #while (ny < image_height)
>                  #declare paint_pig = pig_map (nx+0.5,ny+0.5,0);
>                  box {
>                          0, 1
>                          pigment {color srgb <max (paint_pig.x,
> 1-paint_pig.x),max (paint_pig.y, 1-paint_pig.y),max (paint_pig.z,
> 1-paint_pig.z)>*2-1}
>                          finish {emission 1 diffuse 0}
>                          translate <nx-image_width*0.5,ny-image_height*0.5,0>
>                  }
>                  #declare ny = ny+1;
>          #end
>          #declare nx = nx+1;
>          #debug concat (str (nx/image_width*100, 0, 1)," % processed \n")
> #end
> 
> 
> Norbert
> 
> 


-- 

Regards
     Stephen

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