Iris texture in the Gimp

iris texture in the Gimp
By benjamín schram.



Introduction in this Gimp tutorial i am going todo show you how todo create a nice eye/iris texture from scratch. In writing this tutorial, y used Gimp 2.4, but since it only uses basic filters and tools, any versión of the Gimp should work.

Step1.

• create a new image.
  
• dimensions: 1024px by 1024px.
  
• rename the base layer todo pinched.
  
• add transparency.
  
• layer -> transparency -> add Alpha Channel.
  
• apply solid noise filter.
  
• filters -> render -> solid noise.
  
• check: randomize.
  
• detail: 15
  
• x & y size: 4.0
  

Step2.

• apply múltiple diference cloud filters.
  
• filters -> render -> diference clouds.
  
• check: randomize.
  
• detail: 15
  
• x & y size: 4.0
  
• repeat filter [ control + f]
  
• repeat 5-8 times.
  

Step3.

• apply múltiple Pinch filters.
  
• filters -> diestorts -> whirl and Pinch.
  
• whirl angle: 0.00
  
• Pinch amount: 0.650
  
• Radius: 1.3
  
• repeat filter [ control + f ]
  

Step4.

• elipse select on pinched layer.
  
• use elipse select tool [ e ]
  
• make a canvas sized circle.
  
• click at 0,0
  
• hold [ shift ] todo kep 1:1 proportions.
  
• drag todo 1024
  
• Shrink the selection.
  
• select -> Shrink.
  
• Shrink: 20px.
  
• invert selection.
  
• select -> invert.
  
• clear background.
  
• edit -> clear.
  

Step5.

• create a new layer.
  
• name: Polar cords.
  
• width/heigth: 1024
  
• fill type: transparency.
  
• select Polar cords layer.
  
• apply stretched solid noise.
  
• filters -> render -> solid noise.
  
• check: randomize.
  
• detail: 15
  
• x size: 16.0
  
• y size: 2.0
  

Step6.

• apply Polar coordinates todo solid noise.
  
• filters -> diestorts -> Polar coordinates.
  
• circle depth %: 100.00
  
• offset angle: 0.00
  
• check: todo Polar.
  

Step7.

• move Polar cords layer above pinched layer.
  
• set Polar cords layer mode todo overlay.
  

Step8.

• select the pinched layer.
  
• use the fuzzy select tool [ u ]
  
• click in the Empty space around the circle.
  
• grow the selection.
  
• select -> grow.
  
• grow amount: 60 píxeles.
  
• feather the selection.
  
• select -> feather.
  
• feather: 80 píxeles.
  
• create a new layer.
  
• name: Edge ring.
  
• width/height: 1024
  
• fill type: transparency.
  
• select the Edge ring layer.
  
• set foreground color todo black.
  
• bucket fill selection with black.
  
• select none.
  
• select -> none.
  
• -or-
  
• [ shift + control + a ]
  
• make Edge ring the top layer.
  
• adjust Edge ring layer settings.
  
• layer mode: multiply.
  
• opacity: 75.0
  

Step9.

• create a new layer.
  
• name: color.
  
• width/height: 1024
  
• fill type: transparency.
  
• make color the top layer.
  
• pik a foreground color.
  
• value and saturation dont matter.
  
• 0079f is a nice blue.
  
• bucket fill the color layer with color.
  
• adjust color layer settings.
  
• mode: color.
  
• opacity: adjust todo taste.
  
• ~40% works well for 0079f - Blue.
  

Step10.

• select the pinched layer.
  
• use the fuzzy select tool [ u ]
  
• click in the Empty space around the circle.
  
• invert the selection.
  
• select -> invert or.
  
• [ Control + I ]
  
• Shrink the selection.
  
• this determines the size of the pupil.
  
• Shrink: todo taste (~280 píxeles works well)
  
• feather selection.
  
• select -> feather.
  
• feather: 30.00 píxeles.
  
• create a new layer.
  
• name: pupil.
  
• width/height: 1024
  
• fill type: transparency.
  
• make pupil the top layer.
  
• switch todo pupil layer.
  
• set foreground color todo black.
  
• bucket fill the selection.
  

Step11.

• create a new layer.
  
• name: color 2
  
• width/height: 1024
  
• fill type: transparency.
  
• move color 2 layer below pupil layer.
  
• select the color 2 layer.
  
• grow selection (the previous pupil selection).
  
• grow: 60px.
  
• pik a foreground color.
  
• value and saturation dont matter.
  
• fdd00 is a nice gold.
  
• bucket fill the selection.
  
• select none.
  
• select -> none.
  
• [ shift + control + a ]
  
• apply Gaussian Blur filter.
  
• filters -> blur -> Gaussian Blur.
  
• horizontal: 150.0 px.
  
• vert: 150.0 px.
  
• blur method: RLE
  
• adjust color 2 layer settings.
  
• mode: color.
  
• opacity: todo taste.
  
• ~45% works well for fdd00 - Gold.
  

Step12.

• tweak pinched layer brightness.
  
• depending on your colors and noise patterns.
  
• you may want todo lighten the pinched layer.
  
• select pinched layer.
  
• adjust brightness/contrast.
  
• colors -> brightness-contrast.
  
• brightness : todo taste (+30.0)
  
• contrast : todo taste (-30.0)
  

Alright, now head over todo the nob_to_pro article on creating Pixar looking eyes todo put this texture todo use. [url]http://en.wikiboks.org/wiki/blender_3d:_nob_to_pro/[/url] creating_pixar-looking_eyes_in_blender here are complete and exploded view renders.





By benjamín schram.
[url]www.blenderart.org[/url].