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<h6 id="header">RMagick User's Guide and Reference</h6>
<div class="nav">
« <a href="info.html">Prev</a> | <a href=
"index.html">Contents</a> | <a href=
"index.html">Next</a> »
</div>
<h1>Constants</h1>
<div id="toc">
<h2>Table of Contents</h2>
<h3>Constants</h3>
<div class="toccol">
<ul>
<li><a href="#Miscellaneous_constants">Miscellaneous
constants</a></li>
<li><a href="#AlignType">AlignType</a></li>
<li><a href="#ChannelType">ChannelType</a></li>
<li><a href="#ClassType">ClassType</a></li>
<li><a href="#ColorspaceType">ColorspaceType</a></li>
<li><a href="#ComplianceType">ComplianceType</a></li>
<li><a href="#CompositeOperator">CompositeOperator</a></li>
<li><a href="#CompressionType">CompressionType</a></li>
</ul>
</div>
<div class="toccol">
<ul>
<li><a href="#DecorationType">DecorationType</a></li>
<li><a href="#DisposeType">DisposeType</a></li>
<li><a href="#EndianType">EndianType</a></li>
<li><a href="#FilterType">FilterType</a></li>
<li><a href="#GravityType">GravityType</a></li>
<li><a href="#ImageType">ImageType</a></li>
<li><a href="#InterlaceType">InterlaceType</a></li>
<li><a href="#NoiseType">NoiseType</a></li>
</ul>
</div>
<div class="toccol">
<ul>
<li> </li>
<li><a href="#Opacity">Opacity</a></li>
<li><a href="#PaintMethod">PaintMethod</a></li>
<li><a href="#RenderingIntent">RenderingIntent</a></li>
<li><a href="#ResolutionType">ResolutionType</a></li>
<li><a href="#StretchType">StretchType</a></li>
<li><a href="#StyleType">StyleType</a></li>
<li><a href="#WeightType">WeightType</a></li>
</ul>
</div>
</div>
<h2 class="methods">Constants</h2>
<h3 class="const" style="margin-top:0" id=
"Miscellaneous_constants">Miscellaneous constants</h3>
<dl>
<dt>Long_version</dt>
<dd>An extended form of the <code>Version</code> constant with
the format shown here:<br />
<code>This is RMagick 1.4.0 ($Date: 2004/07/31 22:03:25 $)
Copyright (C) 2004 by Timothy P. Hunter<br />
Built with ImageMagick 6.0.0 02/25/04 Q8
http://www.imagemagick.org<br />
Built for ruby 1.8.1 (2003-12-25) [i686-linux]<br />
Web page: http://rmagick.rubyforge.org<br />
Email: rmagick@rubyforge.org</code></dd>
<dt>MagickVersion</dt>
<dd>The ×Magick version string. This has the form:<br />
<code>@(#)ImageMagick X.Y.Z MM/DD/YY Q:16
http://www.imagemagick.org</code><br />
or<br />
<code>GraphicsMagick 1.0 05/05/03 Q8
http://www.GraphicsMagick.org/</code></dd>
<dt>MaxRGB</dt>
<dd>The maximum value of a <em>Quantum</em>. A quantum is one
of the red, green, blue, or opacity elements of a pixel in the
RGB colorspace, or cyan, yellow, magenta, or black elements in
the CYMK colorspace.</dd>
<dt>QuantumDepth</dt>
<dd>
The number of bits in a quantum. The relationship between
QuantumDepth and MaxRGB is summarized in this table.
<table summary="number of bits in a quantum" id="maxrgb">
<caption>
How MaxRGB and QuantumDepth are related
</caption>
<tr>
<th>QuantumDepth</th>
<th>MaxRGB</th>
</tr>
<tr>
<td>8</td>
<td>255</td>
</tr>
<tr>
<td>16</td>
<td>65535</td>
</tr>
<tr>
<td>32</td>
<td>4294967295</td>
</tr>
</table>
</dd>
<dt>Version</dt>
<dd>The RMagick version string. This has the form:<br />
<code>RMagick major.minor.teeny</code></dd>
</dl>
<h3 class="const" id="AlignType">AlignType</h3>
<p>Specify text alignment. See <a href=
"draw.html#Draw.align_eq">align=</a>, <a href=
"draw.html#Draw.text_align">text_align</a>.</p>
<dl>
<dt>UndefinedAlign</dt>
<dt>LeftAlign</dt>
<dt>CenterAlign</dt>
<dt>RightAlign</dt>
</dl>
<h3 class="const" id="ChannelType">ChannelType</h3>
<p>Specify an image channel. See <a href=
"image1.html#channel">channel</a>.</p>
<dl>
<dt>UndefinedChannel</dt>
<dt>RedChannel</dt>
<dt>GreenChannel</dt>
<dt>BlueChannel</dt>
<dt>MagentaChannel</dt>
<dt>YellowChannel</dt>
<dt>BlackChannel</dt>
<dt>OpacityChannel</dt>
<dt>AllChannels</dt>
</dl>
<h3 class="const" id="ClassType">ClassType</h3>
<p>Specify the image storage class. See <a href=
"imageattrs.html#class_type">class_type</a>.</p>
<dl>
<dt>UndefinedClass</dt>
<dd>No storage class has been specified.</dd>
<dt>DirectClass</dt>
<dd class="imquote">Image is composed of pixels which represent
literal color values.</dd>
<dt>PseudoClass</dt>
<dd class="imquote">Image is composed of pixels which specify
an index in a color palette.</dd>
</dl>
<h3 class="const" id="ColorspaceType">ColorspaceType</h3>
<p class="imquote">Specify the colorspace that quantization
(color reduction and mapping) is done under or to specify the
colorspace when encoding an output image. Colorspaces are ways of
describing colors to fit the requirements of a particular
application (e.g. Television, offset printing, color
monitors). Color reduction, by default, takes place in the
RGBColorspace. Empirical evidence suggests that distances in
color spaces such as YUVColorspace or YIQColorspace correspond to
perceptual color differences more closely than do distances in
RGB space. These color spaces may give better results when color
reducing an image.</p>
<p><span class="imquote">When encoding an output image, the
colorspaces RGBColorspace, CMYKColorspace, and GRAYColorspace may
be specified. The CMYKColorspace option is only applicable when
writing TIFF, JPEG, and Adobe Photoshop bitmap (PSD)
files.</span> See <a href=
"imageattrs.html#colorspace">colorspace</a>.</p>
<dl>
<dt>UndefinedColorspace</dt>
<dd>No colorspace has been specified.</dd>
<dt>RGBColorspace</dt>
<dd class="imquote">Red-Green-Blue colorspace</dd>
<dt>GRAYColorspace</dt>
<dd> </dd>
<dt>TransparentColorspace</dt>
<dd class="imquote">The Transparent color space behaves
uniquely in that it preserves the matte channel of the image if
it exists.</dd>
<dt>OHTAColorspace</dt>
<dd> </dd>
<dt>XYZColorspace</dt>
<dd> </dd>
<dt>YCbCrColorspace</dt>
<dd> </dd>
<dt>YIQColorspace</dt>
<dd> </dd>
<dt>YPbPrColorspace</dt>
<dd> </dd>
<dt>YUVColorspace</dt>
<dd class="imquote">Y-signal, U-signal, and V-signal
colorspace. YUV is most widely used to encode color for use in
television transmission.</dd>
<dt>CMYKColorspace</dt>
<dd class="imquote">Cyan-Magenta-Yellow-Black colorspace. CYMK
is a subtractive color system used by printers and
photographers for the rendering of colors with ink or emulsion,
normally on a white surface.</dd>
<dt>SRGBColorspace</dt>
<dd>In ×Magick, this constant is named sRGBColorspace,
but since Ruby constants must start with an uppercase letter, I
had to change it.</dd>
<dt>HSLColorspace</dt>
<dd>Available in ImageMagick 5.5.7.</dd>
<dt>HWBColorspace</dt>
<dd>Available in ImageMagick 5.5.7.</dd>
</dl>
<h3 class="const" id="ComplianceType">ComplianceType</h3>
<p>Specify the color standard from which color names are chosen.
See <a href="struct.html#Pixel">to_color</a>.</p>
<dl>
<dt>SVGCompliance</dt>
<dd>Adhere to SVG color standard.</dd>
<dt>X11Compliance</dt>
<dd>Adhere to X11 color standard.</dd>
<dt>XPMCompliance</dt>
<dd>Adhere to XPM color standard.</dd>
<dt>AllCompliance</dt>
<dd>The union of the 3 color standards.</dd>
</dl>
<h3 class="const" id="CompositeOperator">CompositeOperator</h3>
<p><span class="imquote">Select the image composition algorithm
used to compose a <code>composite image</code> with a
<code>image</code>. By default, each of the <code>composite
image</code> pixels are replaced by the corresponding
<code>image</code> tile pixel. Specify
<code>CompositeOperator</code> to select a different
algorithm.</span> See <a href=
"image1.html#composite">composite</a>.</p>
<dl>
<dt>UndefinedCompositeOp</dt>
<dd>No composite operator has been specified.</dd>
<dt>OverCompositeOp</dt>
<dd><span class="imquote">The result is the union of the the
two image shapes with <code>composite image</code> obscuring
<code>image</code> in the region of overlap.</span> The matte
channel of the composite image is respected, so that if the
composite pixel is part or all transparent, the corresponding
image pixel will show through.</dd>
<dt>InCompositeOp</dt>
<dd class="imquote">The result is simply <code>composite
image</code> cut by the shape of <code>image</code>. None of
the image data of <code>image</code> is included in the
result.</dd>
<dt>OutCompositeOp</dt>
<dd class="imquote">The resulting image is <code>composite
image</code> with the shape of <code>image</code> cut out.</dd>
<dt>AtopCompositeOp</dt>
<dd class="imquote">The result is the same shape as
<code>image</code>, with <code>composite image</code> obscuring
<code>image</code> where the image shapes overlap. Note that
this differs from OverCompositeOp because the portion of
<code>composite image</code> outside of <code>image</code>'s
shape does not appear in the result.</dd>
<dt>XorCompositeOp</dt>
<dd class="imquote">The result is the image data from both
<code>composite image</code> and <code>image</code> that is
outside the overlap region. The overlap region will be
blank.</dd>
<dt>PlusCompositeOp</dt>
<dd class="imquote">The result is just the sum of
the image data. Output values are cropped to 255 (no
overflow). This operation is independent of the matte
channels.</dd>
<dt>MinusCompositeOp</dt>
<dd class="imquote">The result of composite image - image, with
overflow cropped to zero. The matte chanel is ignored (set to
255, full coverage).</dd>
<dt>AddCompositeOp</dt>
<dd class="imquote">The result of <code>composite image</code>
+ <code>image</code>, with overflow wrapping around (mod
256).</dd>
<dt>SubtractCompositeOp</dt>
<dd class="imquote">The result of <code>composite image</code>
- <code>image</code>, with underflow wrapping around (mod 256).
The add and subtract operators can be used to perform
reversable transformations.</dd>
<dt>DifferenceCompositeOp</dt>
<dd class="imquote">The result of abs(<code>composite
image</code> - <code>image</code>). This is useful for
comparing two very similar images.</dd>
<dt>MultiplyCompositeOp</dt>
<dd class="imquote">Multiplies the color of each target image
pixel by the color of the corresponding composite image pixel.
The result color is always darker.</dd>
<dt>BumpmapCompositeOp</dt>
<dd class="imquote">The result <code>image</code> shaded by
<code>composite image</code>.</dd>
<dt>ReplaceCompositeOp</dt>
<dd class="imquote">The resulting image is image replaced with
composite image. Here the matte information is ignored.
Available in ImageMagick 6.0.0.</dd>
<dt>CopyCompositeOp</dt>
<dd>Replace the target image with the composite image.</dd>
<dt>CopyRedCompositeOp</dt>
<dd>Copy the red channel from the composite image to the target
image.</dd>
<dt>CopyGreenCompositeOp</dt>
<dd>Copy the green channel from the composite image to the
target image.</dd>
<dt>CopyBlueCompositeOp</dt>
<dd>Copy the blue channel from the composite image to the
target image.</dd>
<dt>CopyOpacityCompositeOp</dt>
<dd>If the composite image's <a href=
"imageattrs.html#matte">matte</a> attribute is
<code>true</code>, copy the opacity channel from the composite
image to the target image. Otherwise, set the target image
pixel's opacity to the intensity of the corresponding pixel in
the composite image.</dd>
<dt>ClearCompositeOp</dt>
<dd>Make the target image transparent. The composite image is
ignored.</dd>
<dt>DissolveCompositeOp</dt>
<dd> </dd>
<dt>DisplaceCompositeOp</dt>
<dd>Displace target image pixels as defined by a displacement
map. The amount of displacement can be controlled via the
<a href="imageattrs.html#geometry">geometry</a> attribute of
the composite image. The default is "20x20".</dd>
<dt>ModulateCompositeOp</dt>
<dd> </dd>
<dt>ThresholdCompositeOp</dt>
<dd> </dd>
<dt>NoCompositeOp</dt>
<dd> </dd>
<dt>DarkenCompositeOp</dt>
<dd>Replace target image pixels with darker pixels from the
composite image.</dd>
<dt>LightenCompositeOp</dt>
<dd>Replace target image pixels with lighter pixels from the
composite image.</dd>
<dt>HueCompositeOp</dt>
<dd>Each pixel in the result image is the combination of the
hue of the target image and the saturation and brightness of
the composite image.</dd>
<dt>SaturateCompositeOp</dt>
<dd>Each pixel in the result image is the combination of the
saturation of the target image and the hue and brightness of
the composite image.</dd>
<dt>ColorizeCompositeOp</dt>
<dd>Each pixel in the result image is the combination of the
brightness of the target image and the saturation and hue of
the composite image. This is the <em>opposite</em> of
LuminizeCompositeOp.</dd>
<dt>LuminizeCompositeOp</dt>
<dd>Each pixel in the result image is the combination of the
brightness of the composite image and the saturation and hue of
the target image. This is the <em>opposite</em> of
ColorizeCompositeOp.</dd>
<dt>ScreenCompositeOp</dt>
<dd>Multiplies the inverse of each image's color
information.</dd>
<dt>OverlayCompositeOp</dt>
<dd> </dd>
<dt>CopyCyanCompositeOp</dt>
<dd>Copy the cyan channel from the composite image to the
target image. Available in ImageMagick 5.5.7.</dd>
<dt>CopyMagentaCompositeOp</dt>
<dd>Copy the magenta channel from the composite image to the
target image. Available in ImageMagick 5.5.7.</dd>
<dt>CopyYellowCompositeOp</dt>
<dd>Copy the yellow channel from the composite image to the
target image. Available in ImageMagick 5.5.7.</dd>
<dt>CopyBlackCompositeOp</dt>
<dd>Copy the black channel from the composite image to the
target image. Available in ImageMagick 5.5.7.</dd>
<dt>DstAtopCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>DstCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>DstInCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>DstOutCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>DstOverCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>SrcAtopCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>SrcCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>SrcInCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>SrcOutCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>SrcOverCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>ColorDodgeCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>ExclusionCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>HardLightCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
<dt>SoftLightCompositeOp</dt>
<dd>Available in ImageMagick 6.0.0</dd>
</dl>
<h3 class="const" id="CompressionType">CompressionType</h3>
<p><span class="imquote">Express the desired compression type
when encoding an image. Be aware that most image types only
support a sub-set of the available compression types. If the
compression type specified is incompatable with the image,
×Magick selects a compression type compatable with the
image type.</span> See <a href=
"imageattrs.html#compression">compression</a>.</p>
<dl>
<dt>UndefinedCompression</dt>
<dd>No compression type has been specified.</dd>
<dt>NoCompression</dt>
<dd>The default for most formats.</dd>
<dt>BZipCompression</dt>
<dd class="imquote">BZip (Burrows-Wheeler block-sorting text
compression algorithm and Huffman coding) as used by
bzip2 utilities</dd>
<dt>FaxCompression</dt>
<dd class="imquote">CCITT Group 3 FAX compression</dd>
<dt>Group4Compression</dt>
<dd class="imquote">CCITT Group 4 FAX compression (used only
for TIFF)</dd>
<dt>JPEGCompression</dt>
<dd>JPEG compression. See <a href=
"http://www.faqs.org/faqs/jpeg-faq/part1/">The JPEG image
compression FAQ</a>.</dd>
<dt>LosslessJPEGCompression</dt>
<dd>This compression format is almost never used.</dd>
<dt>LZWCompression</dt>
<dd class="imquote">Lempel-Ziv-Welch (LZW) compression</dd>
<dt>RunlengthEncodedCompression</dt>
<dd>See the Wikipedia page for <a href=
"http://en.wikipedia.org/wiki/Run_length_encoding">Run-length
encoding</a>.</dd>
<dt>ZipCompression</dt>
<dd class="imquote">Lempel-Ziv compression (LZ77) as used in
PKZIP and GNU gzip.</dd>
</dl>
<h3 class="const" id="DecorationType">DecorationType</h3>
<p>Use with the <a href="draw.html#decorate">decorate=</a> method
in the Draw class to specify the text decoration for the <a href=
"draw.html#annotate">annotate</a> method.</p>
<dl>
<dt>NoDecoration</dt>
<dd>Don't decorate the text.</dd>
<dt>UnderlineDecoration</dt>
<dd>Underline the text.</dd>
<dt>OverlineDecoration</dt>
<dd>Overline the text.</dd>
<dt>LineThroughDecoration</dt>
<dd>Draw a horizontal line through the middle of the text.</dd>
</dl>
<h3 class="const" id="DisposeType">DisposeType</h3>
<p>The value of the <a href="imageattrs.html#dispose">dispose</a>
attribute.</p>
<dl>
<dt>UndefinedDispose</dt>
<dt>NoneDispose</dt>
<dt>BackgroundDispose</dt>
<dt>PreviousDispose</dt>
</dl>
<h3 class="const" id="EndianType">EndianType</h3>
<p>The value of the <a href="imageattrs.html#endian">endian</a>
attribute.</p>
<dl>
<dt>UndefinedEndian</dt>
<dt>LSBEndian</dt>
<dt>MSBEndian</dt>
</dl>
<h3 class="const" id="FilterType">FilterType</h3>
<p><span class="imquote">Used to adjust the filter algorithm used
when resizing images. Different filters experience varying
degrees of success with various images and can take sigificantly
different amounts of processing time. ×Magick uses the
LanczosFilter by default since this filter has been shown to
provide the best results for most images in a reasonable amount
of time. Other filter types (e.g. TriangleFilter) may execute
much faster but may show artifacts when the image is re-sized or
around diagonal lines. The only way to be sure is to test the
filter with sample images.</span> See <a href=
"image3.html#resize">resize</a>.</p>
<dl>
<dt>UndefinedFilter</dt>
<dt>PointFilter</dt>
<dt>BoxFilter</dt>
<dt>TriangleFilter</dt>
<dt>HermiteFilter</dt>
<dt>HanningFilter</dt>
<dt>HammingFilter</dt>
<dt>BlackmanFilter</dt>
<dt>GaussianFilter</dt>
<dt>QuadraticFilter</dt>
<dt>CubicFilter</dt>
<dt>CatromFilter</dt>
<dt>MitchellFilter</dt>
<dt>LanczosFilter</dt>
<dt>BesselFilter</dt>
<dt>SincFilter</dt>
</dl>
<h3 class="const" id="GravityType">GravityType</h3>
<p><span class="imquote">Specify positioning of an object (e.g.
text, image) within a bounding region (e.g. an image). Gravity
provides a convenient way to locate objects irrespective of the
size of the bounding region, in other words, you don't need to
provide absolute coordinates in order to position an object. A
common default for gravity is <em>NorthWestGravity</em>.</span>
See <a href="draw.html#annotate">annotate</a> and <a href=
"image1.html#composite">composite</a>.</p>
<dl>
<dt>ForgetGravity</dt>
<dd class="imquote">Don't use gravity.</dd>
<dt>NorthWestGravity</dt>
<dd class="imquote">Position object at top-left of region</dd>
<dt>NorthGravity</dt>
<dd class="imquote">Postiion object at top-center of
region</dd>
<dt>NorthEastGravity</dt>
<dd class="imquote">Position object at top-right of region</dd>
<dt>WestGravity</dt>
<dd class="imquote">Position object at left-center of
region</dd>
<dt>CenterGravity</dt>
<dd class="imquote">Position object at center of region</dd>
<dt>EastGravity</dt>
<dd class="imquote">Position object at right-center of
region</dd>
<dt>SouthWestGravity</dt>
<dd class="imquote">Position object at left-bottom of
region</dd>
<dt>SouthGravity</dt>
<dd class="imquote">Position object at bottom-center of
region</dd>
<dt>SouthEastGravity</dt>
<dd class="imquote">Position object at bottom-right of
region</dd>
</dl>
<h3 class="const" id="ImageType">ImageType</h3>
<p>Indicate <span class="imquote">the type classification of the
image.</span> See <a href=
"imageattrs.html#image_type">image_type</a> and <a href=
"info.html#image_type_eq">image_type=</a>.</p>
<dl>
<dt>UndefinedType</dt>
<dd>No type has been specified.</dd>
<dt>BilevelType</dt>
<dd class="imquote">Monochrome image</dd>
<dt>GrayscaleType</dt>
<dd class="imquote">Grayscale image</dd>
<dt>PaletteType</dt>
<dd class="imquote">Indexed color (palette) image</dd>
<dt>PaletteMatteType</dt>
<dd class="imquote">Indexed color (palette) image with
opacity</dd>
<dt>TrueColorType</dt>
<dd class="imquote">Truecolor image</dd>
<dt>TrueColorMatteTypeType</dt>
<dd class="imquote">Truecolor image with opacity</dd>
<dt>ColorSeparationType</dt>
<dd class="imquote">Cyan/Yellow/Magenta/Black (CYMK) image</dd>
<dt>ColorSeparationMatteType</dt>
<dd> </dd>
<dt>OptimizeType</dt>
<dd> </dd>
</dl>
<h3 class="const" id="InterlaceType">InterlaceType</h3>
<p>Specify <span class="imquote">the ordering of the red, green,
and blue pixel information in the image. Interlacing is usually
used to make image information available to the user faster by
taking advantage of the space vs time tradeoff. For example,
interlacing allows images on the Web to be recognizable sooner
and satellite images to accumulate/render with image resolution
increasing over time. Use <code>LineInterlace</code> or
<code>PlaneInterlace</code> to create an interlaced GIF or
progressive JPEG image.</span> See <a href=
"imageattrs.html#interlace">interlace</a>.</p>
<dl>
<dt>UndefinedInterlace</dt>
<dd>No interlace type has been specified.</dd>
<dt>NoInterlace</dt>
<dd class="imquote">Don't interlace image
(RGBRGBRGBRGBRGBRGB...)</dd>
<dt>LineInterlace</dt>
<dd class="imquote">Use scanline interlacing
(RRR...GGG...BBB...RRR...GGG...BBB...)</dd>
<dt>PlaneInterlace</dt>
<dd class="imquote">Use plane interlacing
(RRRRRR...GGGGGG...BBBBBB...)</dd>
<dt>PartitionInterlace</dt>
<dd class="imquote">Similar to plane interlacing except that
the different planes are saved to individual files (e.g.
image.R, image.G, and image.B)</dd>
</dl>
<h3 class="const" id="NoiseType">NoiseType</h3>
<p><span class="imquote">Select the type of noise to be added to
the image.</span> See <a href=
"image1.html#add_noise">add_noise</a>.</p>
<dl>
<dt>UniformNoise</dt>
<dt>GaussianNoise</dt>
<dt>MultiplicativeGaussianNoise</dt>
<dt>ImpulseNoise</dt>
<dt>LaplacianNoise</dt>
<dt>PoissonNoise</dt>
</dl>
<h3 class="const" id="Opacity">Opacity</h3>
<p>represent the maximum and minimum levels of opacity. You can
specify a partial level of opacity by choosing a number between
OpaqueOpacity and TransparentOpacity. For example, 25% opacity is
<code>abs(Magick::TransparentOpacity-Magick::OpaqueOpacity) *
0.25</code></p>
<dl>
<dt>TransparentOpacity</dt>
<dd>The minimum amount of opacity.</dd>
<dt>OpaqueOpacity</dt>
<dd>The maximum amount of opacity.</dd>
</dl>
<h3 class="const" id="PaintMethod">PaintMethod</h3>
<p class="imquote">Specify how pixel colors are to be replaced in
the image. See <a href=
"image2.html#matte_floodfill">matte_floodfill</a> and <a href=
"image3.html#texture_floodfill">texture_floodfill</a>.</p>
<dl>
<dt>PointMethod</dt>
<dd class="imquote">Replace pixel color at point.</dd>
<dt>ReplaceMethod</dt>
<dd class="imquote">Replace color for all image pixels matching
color at point.</dd>
<dt>FloodfillMethod</dt>
<dd class="imquote">Replace color for pixels surrounding point
until encountering pixel that fails to match color at
point.</dd>
<dt>FillToBorderMethod</dt>
<dd class="imquote">Replace color for pixels surrounding point
until encountering pixels matching border color.</dd>
<dt>ResetMethod</dt>
<dd class="imquote">Replace colors for <strong>all</strong>
pixels in image with fill color.</dd>
</dl>
<h3 class="const" id="RenderingIntent">RenderingIntent</h3>
<p><span class="imquote">Rendering intent is a concept defined by
ICC Spec ICC.1:1998-09, "File Format for Color Profiles".
ImageMagick uses RenderingIntent in order to support ICC Color
Profiles.</span></p>
<p class="imquote">From the specification: "Rendering intent
specifies the style of reproduction to be used during the
evaluation of this profile in a sequence of profiles. It applies
specifically to that profile in the sequence and not to the
entire sequence. Typically, the user or application will set the
rendering intent dynamically at runtime or embedding time."</p>
<p>See <a href=
"imageattrs.html#rendering_intent">rendering_intent</a>.</p>
<dl>
<dt>UndefinedIntent</dt>
<dd>No intent has been specified.</dd>
<dt>SaturationIntent</dt>
<dd class="imquote">A rendering intent that specifies the
saturation of the pixels in the image is preserved perhaps at
the expense of accuracy in hue and lightness.</dd>
<dt>PerceptualIntent</dt>
<dd class="imquote">A rendering intent that specifies the full
gamut of the image is compressed or expanded to fill the gamut
of the destination device. Gray balance is preserved but
colorimetric accuracy might not be preserved.</dd>
<dt>AbsoluteIntent</dt>
<dd class="imquote">Absolute colorimetric</dd>
<dt>RelativeIntent</dt>
<dd class="imquote">Relative colorimetric</dd>
</dl>
<h3 class="const" id="ResolutionType">ResolutionType</h3>
<p><span class="imquote">By default, ImageMagick defines
resolutions in pixels per inch. ResolutionType provides a means
to adjust this.</span> See <a href=
"imageattrs.html#units">units</a>.</p>
<dl>
<dt>UndefinedResolution</dt>
<dd>No resolution has been specified.</dd>
<dt>PixelsPerInchResolution</dt>
<dd class="imquote">Density specifications are specified in
units of pixels per inch (english units).</dd>
<dt>PixelsPerCentimeterResolution</dt>
<dd class="imquote">Density specifications are specified in
units of pixels per centimeter (metric units).</dd>
</dl>
<h3 class="const" id="StretchType">StretchType</h3>
<p>See <a href="draw.html#font_stretch_eq">font_stretch=</a>.</p>
<dl>
<dt>NormalStretch</dt>
<dt>UltraCondensedStretch</dt>
<dt>ExtraCondensedStretch</dt>
<dt>CondensedStretch</dt>
<dt>SemiCondensedStretch</dt>
<dt>SemiExpandedStretch</dt>
<dt>ExpandedStretch</dt>
<dt>ExtraExpandedStretch</dt>
<dt>UltraExpandedStretch</dt>
<dt>AnyStretch</dt>
</dl>
<h3 class="const" id="StyleType">StyleType</h3>
<p>See <a href="draw.html#font_style_eq">font_style=</a>.</p>
<dl>
<dt>NormalStyle</dt>
<dt>ItalicStyle</dt>
<dt>ObliqueStyle</dt>
<dt>AnyStyle</dt>
</dl>
<h3 class="const" id="WeightType">WeightType</h3>
<p>The font weight can be specified as one of 100, 200, 300, 400,
500, 600, 700, 800, or 900, or one of the following constants.
See <a href="draw.html#font_weight_eq">font_weight=</a>.</p>
<dl>
<dt>AnyWeight</dt>
<dd>No weight specfied.</dd>
<dt>NormalWeight</dt>
<dd>Equivalent to 400</dd>
<dt>BoldWeight</dt>
<dd>Equivalent to 700</dd>
<dt>BolderWeight</dt>
<dd>Increases weight by 100</dd>
<dt>LighterWeight</dt>
<dd>Decreases weight by 100</dd>
</dl>
<p class="spacer"> </p>
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