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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="generator" content=
"HTML Tidy for Linux/x86 (vers 1st December 2004), see www.w3.org" />
<title>RMagick 0.0.0: class Image::Info - Optional method
arguments</title>
<meta http-equiv="Content-Type" content=
"text/html; charset=us-ascii" />
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<body>
<h6 id="header">RMagick 0.0.0 User's Guide and Reference</h6>
<div class="nav">
« <a href="struct.html">Prev</a> | <a href=
"index.html">Contents</a> | <a href=
"constants.html">Next</a> »
</div>
<h1>class Image::Info - Optional method arguments</h1>
<div id="toc">
<h2>Table of Contents</h2>
<h3>instance methods</h3>
<ul>
<li><a href="#aset">[]=</a></li>
<li><a href="#aref">[]</a></li>
<li><a href="#channel">channel</a></li>
<li><a href="#define">define</a></li>
<li><a href="#undefine">undefine</a></li>
</ul>
<h3>attribute methods</h3>
<div class="toccol">
<ul>
<li><a href="#antialias">antialias</a></li>
<li><a href="#authenticate">authenticate</a></li>
<li><a href="#background_color">background_color</a></li>
<li><a href="#border_color">border_color</a></li>
<li><a href="#colorspace">colorspace</a></li>
<li><a href="#comment">comment</a></li>
<li><a href="#compression">compression</a></li>
<li><a href="#delay">delay</a></li>
<li><a href="#density">density</a></li>
<li><a href="#depth">depth</a></li>
<li><a href="#dispose">dispose</a></li>
<li><a href="#dither">dither</a></li>
</ul>
</div>
<div class="toccol">
<ul>
<li><a href="#extract">extract</a></li>
<li><a href="#filename">filename</a></li>
<li><a href="#fill">fill</a></li>
<li><a href="#font">font</a></li>
<li><a href="#format">format</a></li>
<li><a href="#fuzz">fuzz</a></li>
<li><a href="#gravity">gravity</a></li>
<li><a href="#image_type">image_type</a></li>
<li><a href="#interlace">interlace</a></li>
<li><a href="#label">label</a></li>
<li><a href="#matte_color">matte_color</a></li>
<li><a href="#monitor">monitor</a></li>
</ul>
</div>
<div class="toccol">
<ul>
<li><a href="#monochrome">monochrome</a></li>
<li><a href="#orientation">orientation</a></li>
<li><a href="#origin">origin</a></li>
<li><a href="#page">page</a></li>
<li><a href="#pointsize">pointsize</a></li>
<li><a href="#quality">quality</a></li>
<li><a href="#sampling_factor">sampling_factor</a></li>
<li><a href="#server_name">server_name</a></li>
<li><a href="#size">size</a></li>
<li><a href="#texture">texture</a></li>
<li><a href="#units">units</a></li>
<li><a href="#view">view</a></li>
</ul>
</div>
</div>
<div id="intro">
<h2>The Image::Info class</h2>
<p>Some <code>Image</code> and <code>ImageList</code> methods,
such as <code>read</code> and <code>write</code>, accept an
"optional arguments" block in which you can set attributes that
modify the method's output. These attributes belong to the
<code>Image::Info</code> class. The <code>Image::Info</code>
class exists only to accept optional arguments for those
<code>Image</code> and <code>ImageList</code> methods.</p>
<p>This page explains the methods defined in the
<code>Image::Info</code> class. Generally, each
<code>Image</code> or <code>ImageList</code> method that uses
the <code>Image::Info</code> class to get optional arguments
will only accept some of the attributes listed on this page,
that is, only those attributes that are meaningful for the
particular method. Any other attributes that you set are
ignored. Also, some attributes are only used by a subset of the
image formats. See the ×Magick documentation for more
information.</p>
<p>Remember, you do not ever need to create an
<code>Image::Info</code> object. The object is created for you
before the optional arguments block is entered and destroyed
after the block is exited.</p>
<p>All the attributes in the <code>Image::Info</code> class are
read/write. For simplicity, and because usually you only set
these attributes, this page only describes the setter version
of each attribute method.</p>
</div>
<h2 class="methods">instance methods</h2>
<div class="sig">
<h3 id="aset">[]=</h3>
<p><span class="arg">self</span>[<span class=
"arg">format</span>, <span class="arg">key</span>] =
<span class="arg">value</span> -> <span class=
"arg">self</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Define a format-specific option. An alternative to <a href=
"#define">define</a>, below. Use this method to set options for
reading or writing certain image formats. ImageMagick and
GraphicsMagick support different options, and the list of
supported options changes from release to release. For a list
of the valid image formats, keys, and values, refer to the
documentation for the -define option for the specific release
of the library you're using.</p>
<h4>Arguments</h4>
<dl>
<dt>format</dt>
<dd>An image format name such as "ps" or "tiff".</dd>
<dt>key</dt>
<dd>A string that identifies the option.</dd>
<dt>value</dt>
<dd>The value of the option. <span class="arg">Value</span>
can be any object that responds to <code>to_s</code>. Use
<code>nil</code> to set the key to a null value.</dd>
</dl>
<h4>Returns</h4>
<p>self</p>
<h4>Example</h4>
<pre>
self["tiff", "bits-per-sample"] = 2
</pre>
<h4>Magick API</h4>
<p>SetImageOption (ImageMagick 6.0.0), AddDefinitions
(GraphicsMagick 1.1)</p>
</div>
<div class="sig">
<h3 id="aref">[]</h3>
<p><span class="arg">self</span>[<span class=
"arg">format</span>, <span class="arg">key</span>] ->
<span class="arg">value</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Returns the value of the specified option for the specified
format.</p>
<h4>Arguments</h4>
<dl>
<dt>format</dt>
<dd>An image format name such as "ps" or "tiff".</dd>
<dt>key</dt>
<dd>A string that identifies the option.</dd>
</dl>
<h4>Returns</h4>
<p>The value of the option. Always a string.</p>
<h4>Example</h4>
<pre>
self["tiff", "bits-per-sample"] » 2
</pre>
<h4>Magick API</h4>
<p>GetImageOption (ImageMagick 6.0.0), AccessDefinitions
(GraphicsMagick 1.1)</p>
</div>
<div class="sig">
<h3 id="channel">channel</h3>
<p><span class="arg">self</span>.channel([<span class=
"arg">channel</span> [, <span class=
"arg">channel</span>...]])</p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Restrict the method to the specified channel(s). This
attribute is set-only.</p>
<h4>Argument</h4>
<p>The arguments may be any <a href=
"constants.html#ChannelType">ChannelType</a> values.</p>
<h4>Notes</h4>
<p>If you call <code>channel</code> with no arguments,
<em>all</em> channels are included. If you do not call
<code>channel</code> at all, the channels used do not include
the alpha channel.</p>
</div>
<div class="sig">
<h3 id="define">define</h3>
<p><span class="arg">self</span>.define(<span class=
"arg">format</span>, <span class="arg">key</span>[,
<span class="arg">value</span>])</p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Define a format-specific option. See <a href="#aset">[]=</a>,
above.</p>
<h4>Arguments</h4>
<dl>
<dt>format</dt>
<dd>An image format name such as "ps" or "tiff".</dd>
<dt>key</dt>
<dd>A string that identifies the option.</dd>
<dt>value</dt>
<dd>The value of the option. <span class="arg">Value</span>
can be any object that responds to <code>to_s</code>. If
omitted, the key is simply defined to an null value.</dd>
</dl>
<h4>Returns</h4>
<p>self</p>
<h4>Example</h4>
<pre>
self.define("tiff", "bits-per-sample", 2)
</pre>
<h4>Magick API</h4>
<p>SetImageOption (ImageMagick 6.0.0), AddDefinitions
(GraphicsMagick 1.1)</p>
</div>
<div class="sig">
<h3 id="undefine">undefine</h3>
<p><span class="arg">self</span>.undefine(<span class=
"arg">format</span>, <span class="arg">key</span>)</p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Delete an option definition set by <a href="#aset">[]=</a>
or <a href="#define">define</a>. This is not the same as
setting the option to a null value. The <code>undefine</code>
method removes the option name from the list of options for the
specified format.</p>
<h4>Arguments</h4>
<dl>
<dt>format</dt>
<dd>An image format name such as "ps" or "tiff".</dd>
<dt>key</dt>
<dd>A string that identifies the option.</dd>
</dl>
<h4>Returns</h4>
<p>self</p>
<h4>Example</h4>
<pre>
self.undefine("tiff", "bits-per-sample")
</pre>
</div>
<h2 class="methods">attribute methods</h2>
<div class="sig">
<h3 id="antialias">antialias</h3>
<p><span class="arg">self.</span>antialias= <span class=
"arg"><code>true</code></span> or <span class=
"arg"><code>false</code></span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p><span class="imquote">Control antialiasing of rendered
Postscript and Postscript or TrueType fonts.</span> The default
is <code>true</code>.</p>
</div>
<div class="sig">
<h3 id="authenticate">authenticate</h3>
<p><span class="arg">self.</span>authenticate= <span class=
"arg">aString</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p class="imquote">Decrypt an image with this password.</p>
<p>This attribute can be used to specify the password to be
used when reading an image or image sequence that is in an
encrypted format, such as PDF.</p>
</div>
<div class="sig">
<h3 id="background_color">background_color</h3>
<p><span class="arg">self.</span>background_color= <span class=
"arg">aString</span> or <span class="arg">aPixel</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Set the image background color. The default is "white".</p>
<h4>Arguments</h4>
<p>A <a href="imusage.html#color_names">color name</a> or a
<a href="struct.html#Pixel">aPixel</a>.</p>
</div>
<div class="sig">
<h3 id="border_color">border_color</h3>
<p><span class="arg">self.</span>border_color= <span class=
"arg">aString</span> or <span class="arg">aPixel</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Set the image border color. The default is "#dfdfdf".</p>
<h4>Arguments</h4>
<p>A <a href="imusage.html#color_names">color name</a> or a
<a href="struct.html#Pixel">aPixel</a>.</p>
</div>
<div class="sig">
<h3 id="colorspace">colorspace</h3>
<p><span class="arg">self.</span>colorspace= <span class=
"arg">aColorspaceType</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Specify the image pixel interpretation.</p>
<h4>Arguments</h4>A <a href=
"constants.html#ColorspaceType">ColorspaceType</a> constant.
</div>
<div class="sig">
<h3 id="comment">comment</h3>
<p><span class="arg">self.</span>comment= <span class=
"arg">aString</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p class="imquote">Use this option to assign a specific comment
to the image, when writing to an image format that supports
comments.</p>
<h4>Arguments</h4>
<p class="imquote">You can include the image filename, type,
width, height, or other image attribute by embedding special
format characters listed under the <a href=
"draw.html#annotate">annotate</a> method.</p>
</div>
<div class="sig">
<h3 id="compression">compression</h3>
<p><span class="arg">self.</span>compression= <span class=
"arg">aCompressionType</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Specify the type of compression used when writing the image.
Only some image formats support compression. For those that do,
only some compression types are supported. If you specify an
compression type that is not supported, the default compression
type (usually NoCompression) is used instead.</p>
<p>Some compression types support varying levels of
compression. See the <a href=
"#quality"><code>quality</code></a> attribute.</p>
<p>The following table shows the image formats that support
compression. For each format, the right-hand column shows the
supported compression types. The default compression type is
shown in <strong>bold</strong>.</p>
<table class="simple_table" summary=
"supported compression types by image format">
<caption>
Supported Compression Types
</caption>
<tr>
<th>Format</th>
<th>Compression Types</th>
</tr>
<tr>
<td>BMP</td>
<td><strong>NoCompression</strong>, RLECompression</td>
</tr>
<tr>
<td>DIB</td>
<td><strong>NoCompression</strong>, RLECompression</td>
</tr>
<tr>
<td>FPX</td>
<td><strong>NoCompression</strong>, JPEGCompression</td>
</tr>
<tr>
<td>GIF</td>
<td><strong>LZWCompression</strong> <em>(see Notes,
below)</em></td>
</tr>
<tr>
<td>JNG</td>
<td><strong>NoCompression</strong>, JPEGCompression</td>
</tr>
<tr>
<td>JP2</td>
<td><strong>JPEGCompression</strong>,
LosslessJPEGCompression</td>
</tr>
<tr>
<td>JPG</td>
<td><strong>JPEGCompression</strong>,
LosslessJPEGCompression</td>
</tr>
<tr>
<td>MIFF</td>
<td><strong>NoCompression</strong>, RLECompression</td>
</tr>
<tr>
<td>MNG</td>
<td><strong>NoCompression</strong>, JPEGCompression</td>
</tr>
<tr>
<td>PALM</td>
<td><strong>NoCompression</strong>, FaxCompression,
RLECompression</td>
</tr>
<tr>
<td>PDB</td>
<td><strong>NoCompression</strong>, RLECompression</td>
</tr>
<tr>
<td>PDF</td>
<td><strong>NoCompression</strong>, JPEGCompression,
LZWCompression, ZipCompression</td>
</tr>
<tr>
<td>PICT</td>
<td><strong>NoCompression</strong>, JPEGCompression</td>
</tr>
<tr>
<td>PNG</td>
<td><strong>NoCompression</strong>, ZIPCompression</td>
</tr>
<tr>
<td>PS</td>
<td><strong>NoCompression</strong>, RLECompression</td>
</tr>
<tr>
<td>PS2</td>
<td><strong>RLECompression</strong>, FaxCompression,
JPEGCompression, LZWCompression, NoCompression</td>
</tr>
<tr>
<td>PS3</td>
<td><strong>FaxCompression</strong>, JPEGCompression,
LZWCompression, NoCompression, RLECompression,
ZipCompression</td>
</tr>
<tr>
<td>TIFF</td>
<td><strong>NoCompression</strong>, FaxCompression,
Group4Compression, JPEGCompression, LZWCompression,
RLECompression, ZipCompression</td>
</tr>
</table>
<h5>Notes</h5>
<ol id="compression_notes">
<li>NoCompression is accepted for all image formats. Except
as noted in the table, it is the default.</li>
<li>Prior to July 10, 2004, the default for GIF images was
NoCompression.</li>
<li>×Magick must be configured and built with extra
support to use LZWCompression (in releases prior to July 10,
2004) and LosslessJPEGCompression.</li>
<li>This table is based on my examination of the
×Magick source code. It is not necessarily complete and
it may contain mistakes. If you need an authoritative list,
you should consult the ×Magick developers.</li>
</ol>
<h4>Arguments</h4>A <a href=
"constants.html#CompressionType">CompressionType</a> constant.
</div>
<div class="sig">
<h3 id="density">density</h3>
<p><span class="arg">self.</span>density= <span class=
"arg">aString</span> or <span class="arg">aGeometry</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Specify the vertical and horizontal resolution in pixels.
The default density is "72.0x72.0". This attribute can be used
when writing JBIG, PCL, PS, PS2, and PS3 format images.</p>
<p>This attribute can also be used to specify the width and
height of HISTOGRRAM format images. For HISTOGRAM, the default
is 256x200.</p>
<h4>Arguments</h4>
<p>The argument can be either a string in the form "XxY" where
"X" is the horizontal resolution and "Y" is the vertical
resolution, or a <a href="struct.html#Geometry">Geometry</a>
object where <code>width</code> is the horizontal resolution
and <code>height</code> is the vertical resolution.</p>
</div>
<div class="sig">
<h3 id="delay">delay</h3>
<p><span class="arg">self.</span>delay= <span class=
"arg">anInteger</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p class="imquote">This attribute is useful for regulating the
animation of image sequences. <em>delay</em>/100 seconds must
expire before the display of the next image. The default is no
delay between each showing of the image sequence. The maximum
delay is 65535.</p>
</div>
<div class="sig">
<h3 id="depth">depth</h3>
<p><span class="arg">self.</span>depth= <span class=
"arg">aNumber</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Specify the image depth.</p>
<h4>Arguments</h4>
<p>Either 8, 16, or 32. You can specify 16 and 32 only when
×Magick was compiled with a QuantumDepth that allows
these depth values.</p>
<p>Use <code>depth</code> to specify the depth of CMYK, GRAY,
RGB, RGBA, MAP, and XC format images. See also <a href=
"#size"><code>size</code></a>.</p>
</div>
<div class="sig">
<h3 id="dispose">dispose</h3>
<p><span class="arg">self.</span>dispose= <span class=
"arg">aDisposeType</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p class="imquote">The argument indicates the way in which the
graphic is to be treated after being displayed.</p>
<h4>Argument</h4>
<p>A <a href="constants.html#DisposeType">DisposeType</a>
constant.</p>
</div>
<div class="sig">
<h3 id="dither">dither</h3>
<p><span class="arg">self.</span>dither= <span class=
"arg"><code>true</code></span> or <span class=
"arg"><code>false</code></span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>This attribute can be used when writing GIF images.</p>
<p class="imquote">Apply Floyd/Steinberg error diffusion to the
image. The basic strategy of dithering is to trade intensity
resolution for spatial resolution by averaging the intensities
of several neighboring pixels. Images which suffer from severe
contouring when reducing colors can be improved with this
option.</p>
</div>
<div class="sig">
<h3 id="extract">extract</h3>
<p><span class="arg"><em>self.</em></span>extract= <span class=
"arg">aString</span> or <span class="arg">aGeometry</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Specify a portion of an image to be extracted when the image
is constituted. This attribute can be used to identify a subset
of an image that is otherwise too large to keep in memory.</p>
<h4>Arguments</h4>
<p>Either a geometry string or a <a href=
"struct.html#Geometry">Geometry</a> object. For example:
<code>self.extract = "200x200+100+100"</code>.</p>
</div>
<div class="sig">
<h3 id="filename">filename</h3>
<p><span class="arg">self.</span>filename= <span class=
"arg">aString</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>See <a href="image1.html#capture">capture</a>.</p>
</div>
<div class="sig">
<h3 id="fill">fill</h3>
<p><span class="arg">self.</span>fill= <span class=
"arg">aString</span> or <span class="arg">aPixel</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>In the <code>Image::Info</code> class, the <code>fill</code>
attribute specifies the fill color to use when creating an
image with the "caption:" format..</p>
<h4>Arguments</h4>
<p>A <a href="imusage.html#color_names">color name</a> or a
<a href="struct.html#Pixel">aPixel</a>.</p>
</div>
<div class="sig">
<h3 id="font">font</h3>
<p><span class="arg">self.</span>font= <span class=
"arg">aString</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Set the text rendering font.</p>
</div>
<div class="sig">
<h3 id="format">format</h3>
<p><span class="arg">self.</span>format= <span class=
"arg">aString</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Set the image format, "GIF" or "JPG" for example.</p>
<h4>Arguments</h4>
<p>See <a href=
"http://www.imagemagick.org/script/formats.php">File
Formats</a>.</p>
</div>
<div class="sig">
<h3 id="fuzz">fuzz</h3>
<p><span class="arg">self.</span>fuzz= <span class=
"arg">aNumeric</span> or <span class="arg">aString</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>Set the level of "fuzziness" for comparing pixels. By
default the pixels must be identical to be considered equal.
The larger the <code>fuzz</code> value the more difference is
tolerated. See <a href=
"imageattrs.html#fuzz">Image#fuzz</a>.</p>
<h4>Arguments</h4>
<p>The argument may be a numeric value or a string in the form
"NN%". In the second case, the argument is computed as a
percentage of <a href=
"constants.html#Miscellaneous_constants">MaxRGB</a>. For
example, a value of '5%' sets <code>fuzz</code> to
0.05*MaxRGB.</p>
</div>
<div class="sig">
<h3 id="gravity">gravity</h3>
<p><span class="arg">self.</span>gravity= <span class=
"arg">aGravityType</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p class="imquote">The direction text gravitates to when
annotating the image.</p>
<p class="imquote">The direction you choose specifies where to
position the text when annotating the image. For example, a
gravity of <code>CenterGravity</code> forces the text to be
centered within the image. By default, the image gravity is
<code>NorthWestGravity</code>.</p>
<p>This attribute can be used to position the text when
creating an image with the "caption:" format.</p>
<h4>Arguments</h4>
<p>A <a href="constants.html#GravityType">GravityType</a>
constant.</p>
</div>
<div class="sig">
<h3 id="image_type">image_type</h3>
<p><span class="arg">self.</span>image_type= <span class=
"arg">anImageType</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p>The image type classification. For example, GrayscaleType.
Don't confuse this attribute with the <a href=
"#format">format</a> such as "GIF" or "JPG".</p>
<h4>Arguments</h4>
<p>An <a href="constants.html#ImageType">ImageType</a>
constant.</p>
</div>
<div class="sig">
<h3 id="interlace">interlace</h3>
<p><span class="arg">self.</span>interlace= <span class=
"arg">anInterlaceType</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p><span class="imquote">[S]pecify the type of interlacing
scheme for raw image formats such as RGB or YUV. NoInterlace
means do not interlace, LineInterlace uses scanline
interlacing, and PlaneInterlace uses plane interlacing.
PartitionInterlace is like PlaneInterlace except the different
planes are saved to individual files (e.g. image.R, image.G,
and image.B). Use LineInterlace or PlaneInterlace to create an
interlaced GIF or progressive JPEG image.</span> The default is
NoInterlace.</p>
<h4>Arguments</h4>
<p>An <a href="constants.html#InterlaceType">InterlaceType</a>
constant.</p>
</div>
<div class="sig">
<h3 id="label">label</h3>
<p><span class="arg">self.</span>label= <span class=
"arg">aString</span></p>
</div>
<div class="desc">
<h4>Description</h4>
<p><span class="imquote">Use this option to assign a specific
label to the image, when writing to an image format that
supports labels, such as TIFF, PNG, MIFF, or PostScript. You
can include the the image filename, type, width, height, or
other image attribute by embedding special format
characters.</span> See <a href=