ValueCorrection - Revision history

Caustic: Redirected page to Value correction

2014-10-11T16:19:38Z

Redirected page to Value correction

EricChadwick: fixed images

2014-09-26T11:16:17Z

fixed images

Cheeseplus: 5 revisions

2014-07-29T08:45:57Z

5 revisions

EricChadwick: removed CategoryTexturing (too general)

2010-08-24T15:00:14Z

removed CategoryTexturing (too general)

EricChadwick: formatting, headline, credit syntax

2010-07-08T11:19:29Z

formatting, headline, credit syntax

EricChadwick: categories

2010-07-08T11:09:47Z

EricChadwick: WikiName

2010-07-08T11:09:01Z

WikiName

at 00:00, 1 January 1970

1970-01-01T00:00:00Z

New page

__NOTOC__
* [[Polycount|Main Page]] > [[Category:Primer]] > [[Category:Texturing]] > Value Correction

= Value Correction =
Here's a neat trick.

The problem you are seeing here is that there is a lot of repetitive variation and contrast in the VALUE of your bricks. This technique will help you remove that value variation, but retain the hue variation.

In Photoshop, go to Image -> Mode -> Lab Color

In your channels, notice that you now have a LIGHTNESS channel. select that channel.

Go to Filters -> Other -> High Pass and run it at something in the 2-5 radius range.

Notice that much of your Value variation is now gone!

This is useful for removing contrast, but some of that contrast is good to have and you may not want to remove it all. Experiment with keeping a copy of image that hasn't been equalized in this way, and masking contrast back in only where you want it.

This is useful for any source image that has high value contrast (for instance, if part of it is lit very differently than another part). If you've ever offset an image only to see that each edge is vastly different in value, then this is the technique to use at that point in time. You could make a value-equalized version and paint it in only over the seams you are trying to remove, for instance.

http://www.polycount.com/forum/showthread.php?p=1169603#post1169603

<<BR>>
* [[Polycount|Main Page]] > [[Category:Primer]] > [[Category:Texturing]] > Value Correction

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-__NOTOC__
+#REDIRECT [[Value_correction]]
-<!-- ## page was renamed from Value Correction -->
-= Value Correction =
-Value correction is a texturing method that allows you to remove problems in value variation from a source image. This is a common problem when trying to create tiling textures, and is often due to uneven lighting in the source image.
-−
-== Lab Color Technique ==
-The following Photoshop technique will help you remove value variation but retain the hue variation.
-−
-{| class="wikitable" style="width:512px;"
-|Step 1: Here is a common source image, which looks ripe for usage as a texture!
-|-
-|[[image:value_correction_step1.jpg]]
-|-
-|Image from [http://www.cgtextures.com]
-|}
-−
-{| class="wikitable" style="width:512px;"
-|Step 2: Using Filter -> Other -> Offset reveals that there is uneven lighting in this image, making it difficult to tile. How unfortunate!
-|-
-|[[image:value_correction_step2.jpg]]
-|-
-|Image by [http://www.carlosmontero.com Carlos 'cman2k' Montero]
-|}
-−
-{| class="wikitable" style="width:512px;"
-|Step 3: Go to Image -> Mode -> Lab Color. In your channels, notice that you now have a LIGHTNESS channel. select that channel and notice how you can see clearly how much value variation exists!
-|-
-|[[image:value_correction_step3.jpg]]
-|-
-|Image by [http://www.carlosmontero.com Carlos 'cman2k' Montero]
-|}
-−
-{| class="wikitable" style="width:512px;"
-|Step 4:Go to Filters -> Other -> High Pass and vary the amount until most of the lighting variation is gone. In addition, you can use dodge and burn in this mode to try and hand-fix value variation problems and try to get things as even as possible.
-|-
-|[[image:value_correction_step4.jpg]]
-|-
-|Image by [http://www.carlosmontero.com Carlos 'cman2k' Montero]
-|}
-−
-{| class="wikitable" style="width:512px;"
-|Step 5: Notice that much of your Value variation is now gone!
-|-
-|[[image:value_correction_step5.jpg]]
-|-
-|Image by [http://www.carlosmontero.com Carlos 'cman2k' Montero]
-|}
-−
-{| class="wikitable" style="width:512px;"
-|Step 6:Some standard clone-brushing helps you create a tiling texture like you normally would.
-|-
-|[[image:value_correction_step6.jpg]]
-|-
-|Image by [http://www.carlosmontero.com Carlos 'cman2k' Montero]
-|}
-−
-{| class="wikitable" style="width:512px;"
-|Step 7: Using Levels and Offset again shows that you have a wonderful tiling texture with very little tiling problems. As a happy side-effect, this technique also has a habit of subduing lighting information (shadows & highlights) which is great for dynamic lighting with normal maps and specular in most engines.
-|-
-|[[image:value_correction_step7.jpg]]
-|-
-|Image by [http://www.carlosmontero.com Carlos 'cman2k' Montero]
-|}
-−
-Note: This is useful for removing contrast, but some of that contrast is good to have and you may not want to remove it all. Experiment with keeping a copy of image that hasn't been equalized in this way, and masking contrast back in only where you want it. For instance, you could make a value-equalized version and paint it in only over the seams you are trying to remove.
-−
-Original thread: http://www.polycount.com/forum/showthread.php?p=1169603#post1169603
-−
-----
-[[Category:TextureTechnique]]

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 The following Photoshop technique will help you remove value variation but retain the hue variation.
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 <!-- ## page was renamed from Value Correction -->
 = Value Correction =
-Value Correction is a method that allows you to remove problems in value variation from a source image.
+== Lab Color Technique ==
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-<<BR>><<BR>><<BR>>
+Note: This is useful for removing contrast, but some of that contrast is good to have and you may not want to remove it all. Experiment with keeping a copy of image that hasn't been equalized in this way, and masking contrast back in only where you want it. For instance, you could make a value-equalized version and paint it in only over the seams you are trying to remove.
-Notes on this technique:
 This is useful for removing contrast, but some of that contrast is good to have and you may not want to remove it all. Experiment with keeping a copy of image that hasn't been equalized in this way, and masking contrast back in only where you want it.
-−
 For instance, you could make a value-equalized version and paint it in only over the seams you are trying to remove.
-Original thread;
+Original thread: http://www.polycount.com/forum/showthread.php?p=1169603#post1169603
 http://www.polycount.com/forum/showthread.php?p=1169603#post1169603
 ----
 [[Category:Texturing]] [[Category:TextureTechnique]]

← Older revision	Revision as of 08:45, 29 July 2014
(No difference)