Iris texture in the Gimp

iris texture in the Gimp
By benjamín schram.

https://www.foro3d.com/extras/tutori...-texture/1.jpg

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

https://www.foro3d.com/extras/tutori...-texture/2.jpg

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.

https://www.foro3d.com/extras/tutori...-texture/3.jpg

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 ]

https://www.foro3d.com/extras/tutori...-texture/4.jpg

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.

https://www.foro3d.com/extras/tutori...-texture/5.jpg

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

https://www.foro3d.com/extras/tutori...-texture/6.jpg

Step6.

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

https://www.foro3d.com/extras/tutori...-texture/7.jpg

Step7.

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

https://www.foro3d.com/extras/tutori...-texture/8.jpg

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

https://www.foro3d.com/extras/tutori...-texture/9.jpg

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.

https://www.foro3d.com/extras/tutori...texture/10.jpg

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.

https://www.foro3d.com/extras/tutori...texture/11.jpg

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.

https://www.foro3d.com/extras/tutori...texture/12.jpg

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. http://en.wikiboks.org/wiki/blender_3d:_nob_to_pro/ creating_pixar-looking_eyes_in_blender here are complete and exploded view renders.

https://www.foro3d.com/extras/tutori...texture/14.jpg

https://www.foro3d.com/extras/tutori...texture/15.jpg

By benjamín schram.
www.blenderart.org.