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<div class="titlepage">
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<h3 class="title"><a id="plug-in-decompose"></a>3.16. Decompose</h3>
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<h3 class="title"><a id="gimp-edit-stroke-selection"></a>3.16. Stroke Selection</h3>
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<a id="id2972290" class="indexterm"></a>
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<a id="id3348354" class="indexterm"></a>
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<div class="mediaobject">
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<img src="../images/filters/filters-color-decompose.png" />
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<div class="simplesect" lang="en" xml:lang="en">
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<div class="titlepage">
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<h4 class="title"><a id="id2972322"></a>Overview</h4>
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This filter is found in
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<span class="guimenuitem">Image>Filters/Colors/<span class="accel">D</span>ecompose</span>
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This filter separates an image into its different components (RGB, HSV...).
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<div class="simplesect" lang="en" xml:lang="en">
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<div class="titlepage">
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<h4 class="title"><a id="id2972352"></a>Options</h4>
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<div class="variablelist">
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<span class="term">Decompose to Layers</span>
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If this option is checked, greyscaled images will not be displayed straight away.
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<span class="term">RGB Decomposing</span>
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If the RGB radio button is clicked, a grey level image is created with three layers (Red, Green
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and Blue), and two channels (Grey and Alpha).
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This function is interesting when using Threshold tool. You can also perform operations like
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cutting, pasting or moving selections in a single RBG channel. You can use an extracted
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grayscale as a selection or mask by saving it in a channel (right-click>Select>Save to a
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<span class="term">RGBA Decomposing</span>
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If the RGBA radio button is clicked, a image is created similar at the RGB Decomposing
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with a additional Alpha layer filled with the transparencies values of the source image.
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The full translucent pixels are black and the full opaque pixels are white.
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<span class="term">HSV Decomposing</span>
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This option decomposes image into three greyscaled layers, one for Hue, one for Saturation
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and another for Value.
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Although <span class="guilabel">Hue</span> is greyscaled, it does represent hues. In color circle,
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white and black are starting point and are superimposed. They represent Red color at top of
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circle. Grey intermediate levels are corresponding to intermediate hues on circle: dark grey to
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orange, mid grey to green and light grey to magenta.
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<span class="guilabel">Saturation</span> and <span class="guilabel">Value</span>: White is maximum Saturation
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(pure color) and maximum Value (very bright). Black is minimum Saturation (white) and minimum
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<span class="term">CMY Decomposing</span>
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This option decomposes image into three greyscaled layers, one for Yellow, one for Magenta
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and another for Cyan.
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This option might be useful to transfer image into printing softwares with CMY capabilities.
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<span class="term">CMYK Decomposing </span>
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This option is similar at the <span class="guilabel">CMY Decomposing</span> with a additonnal
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This option might be useful to transfer image into printing softwares with CMY capabilities.
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<span class="term">Alpha Decomposing</span>
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This option extracts the image transparency stored in the Alpha channel in
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<a href="ch04s03.html" title="3. Channels dialog">Channel dialog</a>
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in a separate image. The full translucent pixels are Black the full opaque
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pixels are white. The graytones are smooth transitions of the transparency
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<span class="term">LAB Decomposing</span>
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This option decomposes image into three greyscaled layers, layer "L"
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for Luminance, layer "A" for colors between green and red, layer "B"
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for colors between blue and yellow.
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The LAB Decomposing is a color model of the Luminance-Color family. A channel is
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used for the Luminosity while two other channels are used for the Colors.
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The LAB color model is used by Photoshop.
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<span class="term">YCbCr Decomposing</span>
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In Gimp there is four YCbCr decompositions with different values. Each option
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decomposes image in three greyscaled layers, a layer for Luminance and two other
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for blueness and redness.
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The YCbCr color model also called YUV is now used for digital video (initially for
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PAL analog video). It's based on the idea that the human eye is most sensitive to
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luminosity, next to colors. The YCbCr Decomposing use a transformation matrix and
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the different options are different values recommanded by ITU (International
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Telecommunication Union) applied to the matrix .
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<img src="../images/dialogs/dialogs-menus-imagewindow-edit-stroke.png" />
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This command is found at
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<span class="guimenu">Edit</span>-><span class="guimenuitem">Stroke Path...</span>.
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You have two operating methods to stroke a selection, using or without
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<div class="simplesect" lang="en" xml:lang="en">
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<div class="titlepage">
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<h4 class="title"><a id="id3348578"></a>Options</h4>
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<div class="variablelist">
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You don't use any paint tool, but many many parameters are
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<span class="term">Stroke Width</span>
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You can set the path width using the slider or the text box.
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Default is pixels, but you can choose another unit by the
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<span class="term">Cap Style</span>
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This option is not useful for selections that are always
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<span class="term">Join Style</span>
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You can choose the shape the selection corners will have by
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clicking on <span class="emphasis"><em>Miter</em></span>, <span class="emphasis"><em>Round</em></span>
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or <span class="emphasis"><em>Bevel</em></span>.
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<span class="term">Miter limit</span>
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This option has not, with selections, the interest it has with
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<span class="term">Dash Pattern</span>
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Dash is shown at a pixel level in a small box. You can modify
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it as you want. An area with thin vertical lines inside the
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box shows the limits of the pixels. If you click on it you add
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a pixel to the dash. If you click outside, you remove a pixel.
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<span class="term">Dash Preset</span>
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You can select a dash pattern in the drop-down combination box.
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<span class="term">Anti-aliasing</span>
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Oblique or rounded strokes may have stepped borders. This
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option smoothes them.
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<span class="term">Style</span>
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You can choose either the <span class="emphasis"><em>Solid</em></span> or the
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<span class="emphasis"><em>Pattern</em></span> style. Pattern is that selected
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<div class="variablelist">
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<b>Stroke using a Paint Tool</b>
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<span class="term">Paint Tool</span>
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You can select a paint tool in the drop-down box to enjoy all
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its options in order to stroke the path.