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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>12.3. Gradient Editor</title>
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<th colspan="3" align="center" id="chaptername">12.3. Gradient Editor</th>
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<tr>
<td width="20%" align="left"><a accesskey="p" href="ch04s12s02.html">Prev</a> </td>
<th width="60%" align="center" id="sectionname">12.3. Gradient Editor</th>
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<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="gimp-gradient-editor-dialog"></a>12.3. Gradient Editor</h3>
</div>
</div>
</div>
<a id="gimp-gradient-edit"></a>
<div class="informalfigure">
<div class="mediaobject">
<img src="../images/dialogs/dialogs-gradient-editor.png" />
<div class="caption">
<p>
The gradient editor
</p>
</div>
</div>
</div>
<p>
The Gradient Editor allows you to edit the colors in a
gradient. It can only be used on gradients you have created
yourself, not on the gradients that come pre-installed with
GIMP. This is a sophisticated tool that may take a bit of
effort to understand. The concept behind it is that a gradient
can be decomposed into a series of adjoining
<span class="emphasis"><em>segments</em></span>, with each segment consisting of a
smooth transition from the color on the left edge to the color
on the right edge. The Gradient Editor allows you to pack
together any number of segments, with any colors you want for the
left and right edges of each segment, and with several options for
the shape of the transition from left to right.
</p>
<div class="variablelist">
<p class="title">
<b>Layout</b>
</p>
<dl>
<dt>
<span class="term">Name</span>
</dt>
<dd>
<p>
At the top of the dialog you see the name of the
gradient. You can edit this if you want to.
</p>
</dd>
<dt>
<span class="term">Gradient Display</span>
</dt>
<dd>
<p>
Below the name, you see the current result of your work.
</p>
</dd>
<dt>
<span class="term">Range Selection/Control Sliders</span>
</dt>
<dd>
<p>
Below the gradient display, you see a set of black and
white triangles lined up in row. A
<span class="emphasis"><em>segment</em></span> is the space between two
consecutive <span class="emphasis"><em>black</em></span> triangles. Inside
each segment is a white triangle, which is used to "warp"
the colors in the segment, in the same way that the middle
slider in the Levels tool warps the colors there. You can
select a segment by clicking between the two black triangles
that define it. You can select a range of segments
by shift-clicking on them. The selected range always
consists of a set of <span class="emphasis"><em>consecutive</em></span>
segments, so if you skip over any when shift-clicking, they
will be included automatically.
If "Instant update" is checked, the display is updated
immediately after any slider movement; if it is unchecked,
updates only occur when you release the mouse button.
</p>
</dd>
<dt>
<span class="term">Scrollbar</span>
</dt>
<dd>
<p>
Below the sliders is a scrollbar. This only comes into play if
you zoom in using the buttons at the bottom.
</p>
</dd>
<dt>
<span class="term">Feedback Area</span>
</dt>
<dd>
<p>
Below the sliders is an area that initially is blank, but
depending on your actions, helpful hints or feedback
messages may appear here.
</p>
</dd>
<dt>
<span class="term">Buttons</span>
</dt>
<dd>
<p>
At the bottom of the dialog appear five buttons:
</p>
<p><b>Save. </b>
Clicking this button causes the gradient, in its current
state, to be saved in your personal
<tt class="filename">gradients</tt> folder, so that it will
automatically be loaded the next time you start GIMP.
</p>
<p><b>Revert. </b>
Clicking this button undoes all of your editing. (However,
at the time this is being written, this function is not yet
implemented.)
</p>
<a id="gimp-gradient-editor-zoom-out"></a>
<p><b>Zoom Out. </b>
Clicking this button shrinks the gradient display
horizontally.
</p>
<a id="gimp-gradient-editor-zoom-in"></a>
<p><b>Zoom In. </b>
Clicking this button expands the gradient display
horizontally. You can then use the scrollbar to pan the
display left or right.
</p>
<a id="gimp-gradient-editor-zoom-all"></a>
<p><b>Zoom All. </b>
Clicking this button resizes the display horizontally so that
it fits precisely into the window.
</p>
</dd>
</dl>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3340465"></a>Gradient Editor Menu</h4>
</div>
</div>
</div>
<div class="informalfigure">
<div class="mediaobject">
<img src="../images/dialogs/dialogs-gradient-editor-menu.png" />
<div class="caption">
<p>
The Gradient Editor menu
</p>
</div>
</div>
</div>
<p>
You can access the Gradient Editor menu either by
right-clicking on the gradient display, or by choosing the top
item in the dialog's tab menu. The menu allows you to set the
left and right edge colors for each segment, and control the
transition from one color to the other.
</p>
<div class="variablelist">
<p class="title">
<b>Options</b>
</p>
<dl>
<dt>
<span class="term">Left [Right] Endpoint's Color</span>
</dt>
<dd>
<a id="gimp-gradient-editor-left-color"></a>
<a id="gimp-gradient-editor-right-color"></a>
<p>
These options allow you to choose a color for the
respective endpoint using a Color Editor.
</p>
</dd>
<dt>
<span class="term">Load Left [Right] Color From</span>
</dt>
<dd>
<a id="gimp-gradient-editor-left-load"></a>
<a id="gimp-gradient-editor-right-load"></a>
<div class="informalfigure">
<div class="mediaobject">
<img src="../images/dialogs/dialogs-gradient-editor-colorfrom.png" />
<div class="caption">
<p>
The "Load Color From" submenu
</p>
</div>
</div>
</div>
<p>
These options give you a number of alternative ways of
assigning colors to the endpoints. From the submenu you
can choose (assuming we're dealing with the left
endpoint):
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p><b>Left Neighbor's Right Endpoint. </b>
This choice will cause the color of the right endpoint
of the segment neighboring on the left to be assigned
to the left endpoint of the selected range.
</p>
</li>
<li>
<p><b>Right Endpoint. </b>
This choice will cause the color of the right endpoint
of the selected range to be assigned to the left
endpoint.
</p>
</li>
<li>
<p><b>FG/BG color. </b>
These choice cause GIMP's current foreground or
background color, as shown in the Toolbox, to be
assigned to the endpoint.
</p>
</li>
<li>
<p><b>RGBA slots. </b>
At the bottom of the menu are 10 "memory slots". You
can assign colors to them using the "Save" menu option
described below. If you choose one of the slots, the
color in it will be assigned to the endpoint.
</p>
</li>
</ul>
</div>
</dd>
<dt>
<span class="term">Save Left [Right] Color To</span>
</dt>
<dd>
<a id="gimp-gradient-editor-left-save"></a>
<a id="gimp-gradient-editor-right-save"></a>
<p>
These options cause the color of the endpoint in
question to be assigned to the "memory slot" selected
from the submenu.
</p>
</dd>
<dt>
<span class="term">Blending Function for Selection</span>
</dt>
<dd>
<a id="gimp-gradient-editor-blending"></a>
<div class="informalfigure">
<div class="mediaobject">
<img src="../images/dialogs/dialogs-gradient-editor-blend.png" />
<div class="caption">
<p>
The Blending Function submenu
</p>
</div>
</div>
</div>
<p>
This option determines the course of the transition from
one endpoint of the range to the other, by fitting the
specified type of function to the endpoints and midpoint
of the range.
</p>
</dd>
<dt>
<span class="term">Coloring Type for Selection</span>
</dt>
<dd>
<a id="gimp-gradient-editor-coloring"></a>
<div class="informalfigure">
<div class="mediaobject">
<img src="../images/dialogs/dialogs-gradient-editor-color.png" />
<div class="caption">
<p>
The Coloring Type submenu
</p>
</div>
</div>
</div>
<p>
This option gives you additional control of the type of
transition from one endpoint to the other: as a line
either in RGB space or in HSV space.
</p>
</dd>
<dt>
<span class="term">Flip Selection</span>
</dt>
<dd>
<a id="gimp-gradient-editor-flip"></a>
<p>
This option does a right-to-left flip of the selected
range, flipping all colors and endpoint locations.
</p>
</dd>
<dt>
<span class="term">Replicate Selection</span>
</dt>
<dd>
<a id="gimp-gradient-editor-replicate"></a>
<p>
This option splits the selected range into two parts,
each of which is a perfect compressed copy of the
original range.
</p>
</dd>
<dt>
<span class="term">Split Segments at Midpoints</span>
</dt>
<dd>
<a id="gimp-gradient-editor-split-midpoint"></a>
<p>
This option splits each segment in the selected range in into
two segments, splitting at the location of the white
triangle.
</p>
</dd>
<dt>
<span class="term">Split Segments Uniformly</span>
</dt>
<dd>
<a id="gimp-gradient-editor-split-uniform"></a>
<p>
This option is similar to the previous one, but it
splits each segment halfway between the endpoints,
instead of at the white triangle.
</p>
</dd>
<dt>
<span class="term">Delete Selection</span>
</dt>
<dd>
<a id="gimp-gradient-editor-delete"></a>
<p>
This option deletes all segments in the selected range,
replacing them with a single black triangle at the
center, and enlarging the segments on both sides to fill
the void.
</p>
</dd>
<dt>
<span class="term">Re-center Midpoints in Selection</span>
</dt>
<dd>
<a id="gimp-gradient-editor-recenter"></a>
<p>
This option moves the white triangle for each segment in
the selected range to a point halfway between the
neighboring black triangles.
</p>
</dd>
<dt>
<span class="term">Re-distribute Handles in Selection</span>
</dt>
<dd>
<a id="gimp-gradient-editor-redistribute"></a>
<p>
This option causes the black and white triangles in
the selected range to be shifted so that the distances
from one to the next are all equal.
</p>
</dd>
<dt>
<span class="term">Blend Endpoints' Colors</span>
</dt>
<dd>
<a id="gimp-gradient-editor-blend-color"></a>
<p>
This option is only available if more than one segment
is selected. It causes the colors at interior endpoints
in the range to be averaged, so that the transition
from each segment to the next is smooth.
</p>
</dd>
<dt>
<span class="term">Blend Endpoints' Opacity</span>
</dt>
<dd>
<a id="gimp-gradient-editor-blend-opacity"></a>
<p>
This option does the same thing as the previous option,
but with opacity instead of color.
</p>
</dd>
</dl>
</div>
<div class="caution" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Caution">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Caution]" src="../images/caution.png" />
</td>
<th align="left">Caution</th>
</tr>
<tr>
<td colspan="2" align="left" valign="top">
<p>
There is no "undo" available within the Gradient Editor, so be
careful!
</p>
</td>
</tr>
</table>
</div>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3340959"></a>The first four gradients in the list</h4>
</div>
</div>
</div>
<p>
The first four gradients in the list are special: they use the
Foreground and Background colors from the Toolbox Color Area,
instead of being fixed. See the <a href="ch02s04s09.html" title="4.9. Gradients">Gradients</a>
section for more information.
</p>
</div>
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</tr>
<tr>
<td width="40%" align="left" valign="top">12.2. Using the Gradients dialog </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
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<td width="40%" align="right" valign="top"> 13. Palettes</td>
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