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[gimp-web] New Tutorial for Layer Masks (and selective coloring example).

commit d74e8076bb71898f85add9591914a8445e4c49e6
Author: Pat David <patdavid src gnome org>
Date:   Fri Sep 27 14:38:35 2013 -0500

    New Tutorial for Layer Masks (and selective coloring example).
    
    New tutorial + assets for an introduction to creating and modifying layer masks.
    
    Signed-off-by: Pat David <patdavid src gnome org>

 tutorials/Layer_Masks/Add-Mask-Dialog.png          |  Bin 0 -> 8539 bytes
 tutorials/Layer_Masks/Bucket-Fill-Tool.png         |  Bin 0 -> 5787 bytes
 tutorials/Layer_Masks/Change-Foreground-Color.png  |  Bin 0 -> 3663 bytes
 tutorials/Layer_Masks/Change-Foreground-Dialog.png |  Bin 0 -> 32045 bytes
 tutorials/Layer_Masks/Layers-Add-Mask-Dialog.png   |  Bin 0 -> 11986 bytes
 tutorials/Layer_Masks/Layers-Base.png              |  Bin 0 -> 5774 bytes
 tutorials/Layer_Masks/Layers-with-Mask.png         |  Bin 0 -> 5222 bytes
 tutorials/Layer_Masks/Masked-Top-Black.png         |  Bin 0 -> 31806 bytes
 tutorials/Layer_Masks/Masked-Various.png           |  Bin 0 -> 47503 bytes
 tutorials/Layer_Masks/SelCol-Base.jpg              |  Bin 0 -> 67384 bytes
 tutorials/Layer_Masks/SelCol-Boy-50.jpg            |  Bin 0 -> 50203 bytes
 tutorials/Layer_Masks/SelCol-Boy-Mask.jpg          |  Bin 0 -> 5283 bytes
 tutorials/Layer_Masks/SelCol-Boy.jpg               |  Bin 0 -> 51015 bytes
 tutorials/Layer_Masks/SelCol-Layers.png            |  Bin 0 -> 7475 bytes
 tutorials/Layer_Masks/Selection-Top-Third.png      |  Bin 0 -> 461 bytes
 tutorials/Layer_Masks/Tool-Rectangle-Select.png    |  Bin 0 -> 17547 bytes
 tutorials/Layer_Masks/index.htrw                   |  131 ++++++++++++++++++++
 tutorials/Layer_Masks/styles.css                   |    3 +
 18 files changed, 134 insertions(+), 0 deletions(-)
---
diff --git a/tutorials/Layer_Masks/Add-Mask-Dialog.png b/tutorials/Layer_Masks/Add-Mask-Dialog.png
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diff --git a/tutorials/Layer_Masks/Tool-Rectangle-Select.png b/tutorials/Layer_Masks/Tool-Rectangle-Select.png
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diff --git a/tutorials/Layer_Masks/index.htrw b/tutorials/Layer_Masks/index.htrw
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--- /dev/null
+++ b/tutorials/Layer_Masks/index.htrw
@@ -0,0 +1,131 @@
+<!--#include virtual="/includes/wgo-xhtml-init.xhtml" -->
+<title>GIMP - Layer Masks</title>
+<link rel="stylesheet" type="text/css" href="styles.css">
+<!--#include virtual="/includes/wgo-look-feel.xhtml" -->
+<!--#include virtual="/includes/wgo-page-init.xhtml" -->
+
+<h1>Layer Masks</h1>
+<p>
+<a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/deed.en_US";><img alt="Creative Commons 
License" style="border-width:0" src="http://i.creativecommons.org/l/by-sa/3.0/80x15.png"; /></a><br /><span 
xmlns:dct="http://purl.org/dc/terms/"; property="dct:title">GIMP Tutorial - Layer Masks (text & images)</span> 
by <a xmlns:cc="http://creativecommons.org/ns#"; href="http://blog.patdavid.net"; property="cc:attributionName" 
rel="cc:attributionURL">Pat David</a> is licensed under a <a rel="license" 
href="http://creativecommons.org/licenses/by-sa/3.0/deed.en_US";>Creative Commons Attribution-ShareAlike 3.0 
Unported License</a>.
+</p>
+
+<h2>Intention</h2>
+<p>
+Layer masks are a fundamental tool in image manipulations. They allow you to selectively modify the opacity 
(transparency) of the layer they belong to.  This differs from the use of the layer <b>Opacity</b> slider as 
a mask has the ability to <i>selectively </i> modify the opacity of different areas across a single layer.
+</p>
+<p>
+This modification of a layer&rsquo;s transparency through a mask is non-destructive to the layer itself.
+</p>
+<p>
+This flexibility to define the opacity of different areas of a layer is the basis for more interesting image 
manipulation techniques such as selective coloring and luminosity masking.
+</p>
+
+<h2>Adding a Mask to a Layer</h2>
+<p>Layer masks need to be added to a layer before they can be used.  The process for adding them is 
simple.</p>
+<div style="text-align: center;"><img src="Layers-Base.png"/><br/><span class='caption'>Layers dialog for 
the image.</span></div>
+<p>
+For this example I will use a simple image with only two layers, as shown above.  There is a base image at 
the bottom of the stack, and a single layer of teal over it.  The teal layer is the active layer (look for 
the white border), and the one which we will add a layer mask to.
+</p>
+<p>
+<b>Right-Click</b> on the layer you want to add a mask to (the &ldquo;Teal&rdquo; layer in my example), and 
the Context menu will show an option to <b>Add Layer Mask&hellip;</b>:
+</p>
+<div style="text-align: center;"><img src="Layers-Add-Mask-Dialog.png"/><br/><span class='caption'>Add Layer 
Mask in the context menu.</span></div>
+<p>
+You can also add a layer mask through the menus: </p>
+<div class="MenuCmd"><span><u>L</u>ayer &rarr; <u>M</u>ask &rarr; Add Layer Mask&hellip;</span></div>
+<p>
+This will then bring up the &ldquo;<b>Add a Mask to the Layer</b>&rdquo; dialog with some options:
+</p>
+<div style="text-align: center;"><img src="Add-Mask-Dialog.png" /><br /><span class="caption">Add mask 
options dialog.</span></div>
+<p>
+There are many options for initializing the Layer Mask.  Notice that the first option is to set the entire 
mask to White, which will result in full opacity on the layer (no transparency from the mask).  The option to 
initialize to Black shows that the mask will make the entire layer fully transparent.
+</p>
+<p>
+For the purposes of this tutorial, we will let the mask initialize to <b>White</b> (full opacity).  You 
should notice a change in your Layers dialog now that shows the layer mask thumbnail to the right of the 
layer it applies to (in this case the &ldquo;Teal&rdquo; layer):
+</p>
+<div style="text-align: center;"><img src="Layers-with-Mask.png" /><br /><span class="caption">Layers dialog 
with mask applied to Teal layer.</span></div>
+<p>
+The layer mask has now been added to the &ldquo;Teal&rdquo; layer.  It is also active (there is a white 
border around the thumbnail in the dialog, but is not visible due to the mask being white as well) and ready 
for modification.
+</p>
+<h2>Modifying a Layers Transparency with the Mask</h2>
+<p>
+At this point, any operations performed on the canvas will apply to the mask, and not to any layers 
themselves.  To illustrate how masks can affect its layers transparency, let&rsquo;s paint!
+</p>
+<p>
+I am going to use the <b>Rectangle Select</b> tool to select roughly the top third of the image, and 
I&rsquo;ll fill this selection with black.
+</p>
+<div class="MenuCmd"><span><u>T</u>ools &rarr; <u>S</u>election Tools &rarr; <u>R</u>ectangle 
Select</span></div>
+<div style="text-align: center;"><img src="Tool-Rectangle-Select.png" /><br /><span 
class="caption">Activating the <b>Rectangle Select</b> tool.</span></div>
+<p>
+Using the <b>Rectangle Select</b> tool, I'll select roughly the top third of the image:
+</p>
+<div style="text-align: center;"><img src="Selection-Top-Third.png" /><br /><span class="caption">Top third 
of the image selected.</span></div>
+<p>
+I want to fill this selection with black, but before I do I need to make sure that my foreground color is 
black.  Click on the foreground color in the <b>Color area</b> to bring up the &ldquo;Change Foreground 
Color&rdquo; dialog:
+</p>
+<div style="text-align: center;"><img src="Change-Foreground-Color.png" /><br /><span class="caption">Click 
the <span style="color: #00FF00;">foreground color</span> to change.</span></div>
+<p>
+The &ldquo;Change Foreground Color&rdquo; dialog allows you to set the foreground color.  For this example 
set the color to black, RGB(0, 0, 0):
+</p>
+<div style="text-align: center;"><img src="Change-Foreground-Dialog.png" /><br /><span 
class="caption">Change the color to black.</span></div>
+<p>
+With the foreground color set, you can now use the <b>Bucket Fill Tool</b> to fill in the selection.
+</p>
+<div class="MenuCmd"><span><u>T</u>ools &rarr; <u>P</u>aint Tools &rarr; <u>B</u>ucket Fill</span></div>
+<div style="text-align: center;"><img src="Bucket-Fill-Tool.png" /><br /><span class="caption">Activating 
the <b style="color: #00FF00;">Bucket Fill</b> tool.</span></div>
+<p>
+You can now click inside the selection to fill it with the foreground color (black).  As soon as you do, 
you'll be presented with a new view of your image on the canvas:
+</p>
+<div style="text-align: center;"><img src="Masked-Top-Black.png" /></div>
+<p>
+As you can see, filling the selected portion of the layer mask with black resulted in that area having 100% 
transparency, showing the layer below it.
+</p>
+<p>
+If you <b>Rectangle Select</b> a different area of the mask, you can fill it in with a different shade of 
gray to produce a variable opacity.  For example, I will select a few different regions of the mask, and fill 
it with different levels of gray:
+</p>
+<div style="text-align: center;"><img src="Masked-Various.png" /></div>
+<p>
+If you examine the layer mask, you'll see that there are different levels of gray being applied (black to 
white, from top to bottom), and their value is what determines the opacity of the layer.
+</p>
+<h2>Selective Colorization Example</h2>
+<p>
+A good example of the application of layer masks is doing selective colorization of an image (selectively 
allowing color to show through a mostly black and white image). I'll walk through how to easily do this with 
an image from Mardi Gras 2013:
+</p>
+<div style="text-align: center;"><img src="SelCol-Base.jpg" /><br /><span class="caption">Mardi Gras 2013, 
Mobile, AL</span></div>
+<p>
+Start the process by duplicating the base image (Shift+Ctrl+D, or Right-Click layer &rarr; Duplicate Layer). 
From the menu:
+</p>
+<div class="MenuCmd"><span><u>L</u>ayer &rarr; D<u>u</u>plicate Layer</span></div>
+<p>
+Following the steps above, add a layer mask to the desaturated layer and initialize it to White (full 
opacity). At this point, the Layers dialog should look like this:
+</p>
+<div style="text-align: center;"><img src="SelCol-Layers.png" /><br /><span class="caption"></span></div>
+<p>
+As before, set your foreground color to black.  This time, rather than filling selections, we are going to 
use the <b>Paintbrush Tool</b> to paint areas of the image we want the color to show through from the layer 
below.
+</p>
+<p>
+I decided to paint the boy on the fence.  Using the <b>Paintbrush Tool</b> I painted over his shirt and 
head.  This allowed those colors to show through from the layer below.  Here are the results after painting:
+</p>
+<div style="text-align: center;"><img src="SelCol-Boy.jpg" /><br /><span class="caption">Simple Selective 
Colorization Example</span></div>
+<p>
+To illustrate what was done, here is the layer mask I painted to achieve the above result:
+</p>
+<div style="text-align: center;"><img src="SelCol-Boy-Mask.jpg" /><br /><span class="caption">Layer mask 
isolated to illustrate</span></div>
+<p>
+Of course, I could have chosen a different color than black to create the mask.  If I wanted a slightly more 
muted color I could have painted with a more middle gray vs. black:
+</p>
+<div style="text-align: center;"><img src="SelCol-Boy-50.jpg" /><br /><span class="caption">Simple Selective 
Colorization Example (painted with gray vs. black).</span></div>
+<h2>Further Reading</h2>
+<ul>
+        <li><a href="../Selective_Color">Selective Colorization</a></li>
+        <li><a href="http://blog.patdavid.net/2011/10/getting-around-in-gimp-layer-masks.html";>Getting 
Around in GIMP - Layer Masks</a></li>
+        <li><a href="http://blog.patdavid.net/2011/10/getting-around-in-gimp-luminosity-masks.html";>Getting 
Around in GIMP - Luminosity Masks & Split Toning</a></li>
+</ul>
+<p>
+The original tutorial this was adapted from may be found <a 
href="http://blog.patdavid.net/2011/10/getting-around-in-gimp-layer-masks.html";>here</a> (possibly with 
updated information).
+</p>
+<div style='text-align: left;'>
+<a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/deed.en_US";><img alt="Creative Commons 
License" style="border-width:0" src="http://i.creativecommons.org/l/by-sa/3.0/80x15.png"; /></a><br /><span 
xmlns:dct="http://purl.org/dc/terms/"; property="dct:title">GIMP Tutorial - Layer Masks (text & images)</span> 
by <a xmlns:cc="http://creativecommons.org/ns#"; href="http://blog.patdavid.net"; property="cc:attributionName" 
rel="cc:attributionURL">Pat David</a>.<br/>Licensed under a <a rel="license" 
href="http://creativecommons.org/licenses/by-sa/3.0/deed.en_US";>Creative Commons Attribution-ShareAlike 3.0 
Unported License</a>.
+</div>
+<!--#include virtual="/includes/wgo-page-fini.xhtml" -->
+<!--#include virtual="/includes/wgo-xhtml-fini.xhtml" -->
diff --git a/tutorials/Layer_Masks/styles.css b/tutorials/Layer_Masks/styles.css
new file mode 100644
index 0000000..a225e92
--- /dev/null
+++ b/tutorials/Layer_Masks/styles.css
@@ -0,0 +1,3 @@
+.MenuCmd { text-align: center; margin-bottom: 1em;}
+.MenuCmd span { font-size: 1.1em; border: dashed 1px gray; padding: 0.2em 1em; background-color: #222; }
+u { text-decoration: underline; }
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