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- POV-Ray Tutorial
Design of Surfaces
- Colors and Textures
Index
texture Syntax
Ready-made Textures
Do-it-yourself Colors
Patterns
Patterns Lists
Warps
uv_mapping
Mapping
- Mapping Methods
- color_map{ ... }
- pigment_map{ ... }
- texture_map{ ... }
- normal_map{ ... }
- average
- material_map{ ... }
- image_map{...}
- image_map+gif 1
- image_map+gif 2
> image_map+gamma
- bump_map{ ... }
- transparency maps 1
- transparency maps 2
- transparency maps 3
Superpositions
Your own Textures
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"image_map{ ... }" and "gamma"
A feature for image_map images, new in POV-Ray version 3.7
There are big differences between POV-Ray version 3.6.2 and version 3.7
in the handling the gamma of images used in image_map:
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"image_map" with POV-Ray 3.6.2:
//--------------------------------------
#version 3.6;
global_settings{ assumed_gamma 1.0 }
#default{ finish{ ambient 0.1 diffuse 0.9}}
//--------------------------------------
// ...
// box with layered textures
box { <-0.04,-0.04,0>,< 1.03, 1.04, 0.01>
// 1st layer: White
texture{
pigment{ color rgb<1,1,1>*1.1 }
finish{ phong 1}
} // ------------------------------
// 2nd layer: image_map
texture{
pigment{
image_map{
jpeg "Image_gamma_0.jpg"
map_type 0
interpolate 2
once
} // end of image_map
} // end of pigment
} // end of texture
scale <4/3,1,1>*1.75
translate<-1.5,0.1,-2>
} // end of box //----------------------- |
A macro for the adjustment of image gamma
in image_maps with POV-Ray version 3.6.2. is
here.
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The image used here for image_map
Image file: Image_gamma_0.jpg
image_map with POV-Ray 3.6 ... a gamma problem!
POV-Ray 3.6.2 scene file: Image_gamma36_1.pov
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"image_map" with POV-Ray 3.7 (RC6):
//--------------------------------------
#version 3.7;
global_settings{ assumed_gamma 1.0 }
#default{ finish{ ambient 0.1 diffuse 0.9}}
//--------------------------------------
// ...
// box with layered textures
box { < -0.04, -0.04,0>,< 1.03, 1.04, 0.01>
// 1st layer: White
texture{
pigment{ color rgb<1,1,1>*1.1 }
finish{ phong 1}
} // ------------------------------
// 2nd layer: image_map
texture{
pigment{
image_map{
jpeg "Image_gamma_0.jpg"
map_type 0
interpolate 2
once
} // end of image_map
} // end of pigment
} // end of texture
scale <4/3,1,1>*1.75
translate<-1.5,0.1,-2>
} // end of box //----------------------- |
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image_map with POV-Ray 3.7, default gamma handling
POV-Ray 3.7 scene file: Image_gamma37_1.pov
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"image_map" in POV-Ray 3.7 (RC6)
with gamma correction of image input:
We can overwrite the default gamma handling!
// box with layered textures
box { < -0.04, -0.04,0>,< 1.03, 1.04, 0.01>
// 1st layer: White
texture{
pigment{ color rgb<1,1,1>*1.1 }
finish{ phong 1}
} // ------------------------------
// 2nd layer: image_map
texture{
pigment{
image_map{
jpeg "Image_gamma_0.jpg"
gamma 2.0
map_type 0
interpolate 2
once
} // end of image_map
} // end of pigment
} // end of texture
scale <4/3,1,1>*1.75
translate<-1.5,0.1,-2>
} // end of box //----------------------- |
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image_map with POV-Ray 3.7 and 'gamma 2.0'
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"image_map" with POV-Ray 3.7 (RC6)
with gamma correction + emission:
// box with layered textures
box { < -0.04, -0.04,0>,< 1.03, 1.04, 0.01>
// 1st layer: White
texture{
pigment{ color rgb<1,1,1>*1.1 }
finish{ phong 1}
} // ------------------------------
// 2nd layer: image_map
texture{
pigment{
image_map{
jpeg "Image_gamma_0.jpg"
gamma 2.5
map_type 0
interpolate 2
once
} // end of image_map
} // end of pigment
finish{ emission 0.3 }
} // end of texture
scale <4/3,1,1>*1.75
translate<-1.5,0.1,-2>
} // end of box //----------------------- |
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image_map with POV-Ray 3.7
and 'gamma 2.5' + 'emission 0.3'
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