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authorFrank Baker <fbaker@hdfgroup.org>2000-12-21 20:29:37 (GMT)
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+<html>
+ <head>
+ <title>Palettes</title>
+ </head>
+
+ <body bgcolor="#FFFFFF">
+
+
+<hr>
+<center>
+<table border=0 width=98%>
+<tr><td valign=top align=left>
+ <a href="index.html">HDF5 documents and links</a>&nbsp;<br>
+ <a href="H5.intro.html">Introduction to HDF5</a>&nbsp;<br>
+ <a href="RM_H5Front.html">HDF5 Reference Manual</a>&nbsp;<br>
+ <!--
+ <a href="Glossary.html">Glossary</a><br>
+ -->
+</td>
+<td valign=top align=right>
+ <br>
+ <a href="H5.user.html">HDF5 User's Guide</a>&nbsp;<br>
+ <a href="ADGuide.html">HDF5 Application Developer's Guide</a>&nbsp;
+</td></tr>
+</table>
+</center>
+<hr>
+
+
+
+
+
+
+
+
+
+
+<center>
+<h1>HDF5 Image and Palette Specification</h1>
+<h3><i>(Major revision: designated Version 1.1 of the Image and Palette Specification)</i></h3>
+</center>
+
+The HDF5 specification defines the standard objects and storage for the
+standard HDF5 objects. (For information about the HDF5 library, model and
+specification, see the HDF documentation.)&nbsp; This document is an additional
+specification do define a standard profile for how to store image data
+in HDF5. Image data in HDF5 is stored as HDF5 datasets with standard attributes
+to define the properties of the image.
+<p>This specification defines:
+<ul>
+<li>
+Standard attributes for an Image dataset</li>
+
+<li>
+Standard storage and attributes for Palettes</li>
+
+<li>
+Standard for associating Palettes with Images.</li>
+</ul>
+
+<h2>
+1. HDF5 Image Specification</h2>
+
+<h3>
+1.1 Overview</h3>
+Image data is stored as an HDF5 dataset with values of HDF5 class Integer
+or Float.&nbsp; A common example would be a two dimensional dataset, with
+elements of type Integer.&nbsp; However, this specification does not limit
+the dimensions or number type that may be used for an Image.
+<p>The dataset for an image is distinguished from other datasets by giving
+it an attribute "CLASS=IMAGE".&nbsp; In addition, the Image dataset has
+an attribute "PALETTE" that points to one or more palettes.
+<p>A Palette is ha HDF5 dataset.&nbsp; A Pallet dataset has an attribute
+"an" and other attributes indicating the type and size of the palette.&nbsp;
+A Palette is an independent object, which can be shared among several Image
+datasets.
+<h3>
+1.2&nbsp; Image Attributes</h3>
+
+<dl>
+<dt>
+Attribute name="<b>CLASS</b>"</dt>
+
+<dd>
+This attribute is of type H5T_C_S1, with size 6.</dd>
+
+<dd>
+For all Images, the value of this attribute is "IMAGE".</dd>
+</dl>
+
+<dd>
+This attribute identifies this data set as intended to be interpreted as
+an image that conforms to the specifications on this page.</dd>
+
+<dl>
+<dt>
+Attribute name="<b>IMAGE_SUBCLASS</b>"</dt>
+
+<dd>
+If present, the value of this attribute indicates the type of Palette that
+should be used with the Image.&nbsp; This attribute is of type H5T_C_S1,
+with size according to the string.&nbsp; The values are:</dd>
+
+<dl>
+<dt>
+"IMAGE_GRAYSCALE"</dt>
+
+<dd>
+A grayscale image, values 0-255 indicating brightness.</dd>
+
+<dt>
+"IMAGE_BITMAP"</dt>
+
+<dd>
+A "bit map" image (???)</dd>
+
+<dt>
+"IMAGE_TRUECOLOR"</dt>
+
+<dd>
+A truecolor image</dd>
+
+<dt>
+"IMAGE_INDEXED"</dt>
+
+<dd>
+An indexed image</dd>
+</dl>
+</dl>
+
+<dt>
+Attribute name="<b>IMAGE_WHITE_IS_ZERO</b>"</dt>
+
+<dl>
+<dd>
+This attribute is of type H5T_NATIVE_UCHAR.&nbsp; 0 = false, 1 = true .&nbsp;
+This is used for images with IMAGE_SUBCLASS="IMAGE_GRAYSCALE" or "IMAGE_BITMAP".</dd>
+</dl>
+
+<dl>
+<dt>
+Attribute name="<b>IMAGE_MINMAXRANGE</b>"</dt>
+
+<dd>
+If present, this attribute is an array of two numbers, of the same HDF5
+datatype as the data.&nbsp; The first element is the minimum value of the
+data, and the second is the maximum.&nbsp; This is used for images with
+IMAGE_SUBCLASS="IMAGE_GRAYSCALE", "IMAGE_BITMAP" or "IMAGE_INDEXED".</dd>
+</dl>
+
+<dt>
+Attribute name="<b>IMAGE_BACKGROUNDINDEX</b>"</dt>
+
+<dl>
+<dd>
+If set, this attribute indicates the index value that should be interpreted
+as the "background color".&nbsp; This attribute is HDF5 type H5T_NATIVE_UINT.</dd>
+</dl>
+
+<dt>
+Attribute name="<b>IMAGE_TRANSPARENCY</b>"</dt>
+
+<dl>
+<dd>
+If set, this attribute indicates the index value that should be interpreted
+as the "transparent color".&nbsp; This attribute is HDF5 type H5T_NATIVE_UINT.&nbsp;
+This attribute may not be used for IMAGE_SUBCLASS="IMAGE_TRUE_COLOR".</dd>
+</dl>
+
+<dt>
+Attribute name="<b>IMAGE_ASPECTRATIO</b>"</dt>
+
+<dl>
+<dd>
+If set, this attribute indicates the aspect ratio.&nbsp; This attribute
+is HDF5 type H5T_NATIVE_UINT.</dd>
+</dl>
+
+<dt>
+Attribute name="<b>IMAGE_COLORMODEL</b>"</dt>
+
+<dl>
+<dd>
+If set, this attribute indicates the color model of Palette that should
+be used with the Image.&nbsp; This attribute is of type H5T_C_S1, with
+size 4,5, or 6.&nbsp; The value is one of the color models described in
+the Palette specification below.&nbsp; This attribute may be used only
+for IMAGE_SUBCLASS="IMAGE_TRUECOLOR" or "IMAGE_INDEXED".</dd>
+</dl>
+
+<dt>
+Attribute name="<b>IMAGE_GAMMACORRECTION</b>"</dt>
+
+<dl>
+<dd>
+If set, this attribute gives the Gamma correction.&nbsp; The type is H5T_NATIVE_FLOAT.&nbsp;
+This attribute may be used only for IMAGE_SUBCLASS="IMAGE_TRUECOLOR" or
+"IMAGE_INDEXED".</dd>
+</dl>
+
+<dt>
+Attribute name="<b>PALETTE</b>"</dt>
+
+<dl>
+<dd>
+A dataset within an HDF5 file may optionally specify an array of palettes
+to be viewed with. The dataset will have an attribute field called "<b>PALETTE</b>"
+which contains an array of object reference pointers which refer to palettes
+in the file. The first palette in this array will be the default palette
+that the data may be viewed with.</dd>
+</dl>
+Attribute name="<b>IMAGE_VERSION</b>"
+<dl>
+<dd>
+This attribute is of type H5T_C_S1, with size corresponding to the length
+of the version string.&nbsp; This attribute identifies the version number
+of this specification to which it conforms.&nbsp; The initial version number
+is "1.0".</dd>
+
+<br>&nbsp;
+<p>&nbsp;
+<br>&nbsp;
+<br>&nbsp;
+<center><table BORDER=2 BGCOLOR="#FFFFFF" >
+<caption>Attributes of an Image Dataset</caption>
+
+<tr>
+<td><b>Attribute Name</b></td>
+
+<td></td>
+
+<td><b>Type</b></td>
+
+<td><b>Value</b></td>
+</tr>
+
+<tr>
+<td>CLASS</td>
+
+<td>R</td>
+
+<td>String</td>
+
+<td>"IMAGE"</td>
+</tr>
+
+<tr>
+<td>PALETTE</td>
+
+<td>O</td>
+
+<td>Array of Object References</td>
+
+<td>&lt;references to Palette datasets><sup>1</sup></td>
+</tr>
+
+<tr>
+<td>IMAGE_SUBCLASS</td>
+
+<td>O<sup>2</sup></td>
+
+<td>String</td>
+
+<td>
+<dt>
+"IMAGE_GRAYSCALE",</dt>
+
+<dt>
+"IMAGE_BITMAP",</dt>
+
+<dt>
+"IMAGE_TRUECOLOR",</dt>
+
+<dt>
+"IMAGE_INDEXED"</dt>
+</td>
+</tr>
+
+<tr>
+<td>PALETTE</td>
+
+<td>O</td>
+
+<td>Array of Object Reference</td>
+
+<td>&lt;references to Palette datasets></td>
+</tr>
+
+<tr>
+<td>IMAGE_WHITE_IS_ZERO</td>
+
+<td>O<sup>3,4</sup></td>
+
+<td>Unsigned Integer</td>
+
+<td>0 = false, 1 = true</td>
+</tr>
+
+<tr>
+<td>IMAGE_MINMAXRANGE</td>
+
+<td>O<sup>3,5</sup></td>
+
+<td>Unsigned Integer[2]</td>
+
+<td>The (&lt;minimum>, &lt;maximum>) value of the data.</td>
+</tr>
+
+<tr>
+<td>IMAGE_BACKGROUNDINDEX</td>
+
+<td>O<sup>3</sup></td>
+
+<td>Unsigned Integer</td>
+
+<td>The index of the background color.</td>
+</tr>
+
+<tr>
+<td>IMAGE_TRANSPARENCY</td>
+
+<td>O<sup>3,5</sup></td>
+
+<td>Unsigned Integer</td>
+
+<td>The index of the transparent color.</td>
+</tr>
+
+<tr>
+<td>IMAGE_ASPECTRATIO</td>
+
+<td>O<sup>3,4</sup></td>
+
+<td>Unsigned Integer</td>
+
+<td>The aspect ratio.</td>
+</tr>
+
+<tr>
+<td>IMAGE_COLORMODEL</td>
+
+<td>O<sup>3,6</sup></td>
+
+<td>String</td>
+
+<td>The color model, as defined below in the Palette specification for
+attribute <b>PAL_COLORMODEL</b>.</td>
+</tr>
+
+<tr>
+<td>IMAGE_GAMMACORRECTION</td>
+
+<td>O<sup>3,6</sup></td>
+
+<td>Float</td>
+
+<td>The gamma correction.</td>
+</tr>
+
+<tr>
+<td>IMAGE_VERSION</td>
+
+<td>R</td>
+
+<td>String</td>
+
+<td>&lt;specification version number></td>
+</tr>
+</table></center>
+
+<dl><font size=-1>1.&nbsp; The first element of the array is the default
+Palette.</font>
+<br><font size=-1>2.&nbsp; This attribute is <b>required</b> for images
+that are converted from one of the standard types listed.</font>
+<br><font size=-1>3. This attribute is <b>required</b> if set for images
+converted from the applicable standard type.</font>
+<br><font size=-1>4.&nbsp; This applies to gray scale images:&nbsp; IMAGE_SUBCLASS="IMAGE_GRAYSCALE"
+or "IMAGE_BITMAP".</font>
+<br><font size=-1>5.&nbsp; This applies to gray scale images:&nbsp; IMAGE_SUBCLASS="IMAGE_GRAYSCALE",
+"IMAGE_BITMAP", or "IMAGE_INDEXED".</font>
+<br><font size=-1>5.&nbsp; This applies to gray scale images:&nbsp; IMAGE_SUBCLASS="IMAGE_TRUECOLOR",
+or "IMAGE_INDEXED".</font></dl>
+</dl>
+
+<h3>
+1.3 Storage Properties for Images</h3>
+Image datasets may be stored with any chunking or compression properties
+supported by HDF5.
+<h2>
+2.&nbsp; HDF5 Palette Specification</h2>
+
+<h3>
+2.1 Overview</h3>
+A palette is the means by which color is applied to an image and is also
+referred to as a color lookup table. It is a table in which every row contains
+the numerical representation of a particular color. In the example of an
+8-bit standard RGB color model palette, this numerical representation of
+a color is presented as a triplet specifying the intensity of red, green,
+and blue components that make up each color.
+<center>
+<p><img SRC="Palettes.fm.anc.gif" ></center>
+
+<p>In this example, the color component numeric type is an 8-bit unsigned
+integer. While this is most common and recommended for general use, other
+component color numeric datatypes, such as a 16-bit unsigned integer ,
+may be used. This type is specified as the type attribute of the palette
+dataset. (see H5Tget_type(), H5Tset_type())
+<p>The minimum and maximum values of the component color numeric are specified
+as attribute of the palette dataset. See below (attribute PAL_MINMAXNUMERIC).
+If these attributes do not exist, it is assumed that the range of values
+will fill the space of the color numeric type. i.e. with an 8-bit unsigned
+integer, the valid range would be 0 to 255 for each color component.
+<p>The HDF5 palette specification additionally allows for color models
+beyond RGB. YUV, HSV, CMY, CMYK, YCbCr color models are supported, and
+may be specified as a color model attribute of the palette dataset. <i>(see
+"Palette Attributes" for details)</i>.
+<p>In HDF 4 and earlier, palettes were limited to 256 colors. The HDF5
+palette specification allows for palettes of varying length. The length
+is specified as the number of rows of the palette dataset.
+<p>In a standard palette, the color entries are indexed directly. HDF5
+supports the notion of a range index table. Such a table defines an ascending
+ordered of ranges that map dataset values to the palette. If a range index
+table exists for the palette, the PAL_TYPE attribute will be set to "RANGEINDEX",
+and the PAL_RANGEINDEX attribute will contain an object reference to a
+range index table array. If not, the PAL_TYPE attribute either does not
+exist, or will be set to "STANDARD".
+<p>The range index table array consists of a one dimensional array with
+the same length as the palette dataset - 1. Ideally, the range index would
+be of the same type as the dataset it refers to, however this is not a
+requirement.
+<p><b>Example 2: A range index array of type floating point</b>
+<center>
+<p><img SRC="PaletteExample1.gif" ></center>
+
+<p>The range index array attribute defines the "<i>to</i>" of the range.
+Notice that the range index array attribute is one less entry in size than
+the palette. The first entry of 0.1259, specifies that all values below
+and up to 0.1259 inclusive, will map to the first palette entry. The second
+entry signifies that all values greater than 0.1259 up to 0.3278 inclusive,
+will map to the second palette entry, etc. All value greater than the last
+range index array attribute (100000) map to the last entry in the palette.
+<h3>
+2.2. Palette Attributes</h3>
+A palette exists in an HDF file as an independent data set with accompanying
+attributes.
+<p>These attributes are defined as follows:
+<dl>
+<dt>
+Attribute name="<b>CLASS</b>"</dt>
+
+<dd>
+This attribute is of type H5T_C_S1, with size 8.</dd>
+
+<dd>
+For all palettes, the value of this attribute is "PALETTE". This attribute
+identifies this palette data set as a palette that conforms to the specifications
+on this page.</dd>
+
+<dt>
+Attribute name="<b>PAL_COLORMODEL</b>"</dt>
+
+<dd>
+This attribute is of type H5T_C_S1, with size 4, 5, or 6.</dd>
+
+<dd>
+Possible values for this are "RGB", "YUV", "CMY", "CMYK", "YCbCr", "HSV".</dd>
+
+<dd>
+This defines the color model that the entries in the palette data set represent.</dd>
+
+<dl>
+<dt>
+"RGB"</dt>
+
+<dd>
+Each color index contains a triplet where the the first value defines the
+red component, second defines the green component, and the third the blue
+component.</dd>
+
+<dt>
+"CMY"</dt>
+
+<dd>
+Each color index contains a triplet where the the first value defines the
+cyan component, second defines the magenta component, and the third the
+yellow component.</dd>
+
+<dt>
+"CMYK"</dt>
+
+<dd>
+Each color index contains a quadruplet where the the first value defines
+the cyan component, second defines the magenta component, the third the
+yellow component, and the forth the black component.</dd>
+
+<dt>
+"YCbCr"</dt>
+
+<dd>
+Class Y encoding model. Each color index contains a triplet where the the
+first value defines the luminance, second defines the Cb Chromonance, and
+the third the Cr Chromonance.</dd>
+
+<dt>
+"YUV"</dt>
+
+<dd>
+Composite encoding color model. Each color index contains a triplet where
+the the first value defines the luminance component, second defines the
+chromonance component, and the third the value component.</dd>
+
+<dt>
+"HSV"</dt>
+
+<dd>
+Each color index contains a triplet where the the first value defines the
+hue component, second defines the saturation component, and the third the
+value component. The hue component defines the hue spectrum with a low
+value representing magenta/red progressing to a high value which would
+represent blue/magenta, passing through yellow, green, cyan. A low value
+for the saturation component means less color saturation than a high value.
+A low value for <i>value</i> will be darker than a high value.</dd>
+</dl>
+
+<dt>
+Attribute name="<b>PAL_TYPE</b>"</dt>
+
+<dd>
+This attribute is of type H5T_C_S1, with size 10 or 11.</dd>
+
+<br>The current supported values for this attribute are : "STANDARD8" or
+"RANGEINDEX"
+<p>A PAL_TYPE of "STANDARD8" defines a palette dataset such that the first
+entry defines index 0, the second entry defines index 1, etc. up until
+the length of the palette - 1. This assumes an image dataset with direct
+indexes into the palette.
+<p>If the PAL_TYPE is set to "RANGEINDEX", there will be an additional
+attribute with a name of "<b>PAL_RANGEINDEX</b>",&nbsp; (See example 2
+for more details)
+<dt>
+Attribute name="<b>PAL_RANGEINDEX</b>"</dt>
+
+<dd>
+The <b>PAL_RANGEINDEX</b> attribute contains an HDF object reference pointer
+which specifies a range index array in the file to be used for color lookups
+for the palette.&nbsp; (Only for PAL_TYPE="RANGEINDEX"</dd>
+
+<dt>
+Attribute name="<b>PAL_MINMAXNUMERIC</b>"</dt>
+
+<dl>
+<dt>
+If present, this attribute is an array of two numbers, of the same HDF5
+datatype as the palette elements or color numerics.</dt>
+
+<br>They specify the minimum and maximum values of the color numeric components.
+For example, if the palette was an RGB of type Float, the color numeric
+range for Red, Green, and Blue could be set to be between 0.0 and 1.0.
+The intensity of the color guns would then be scaled accordingly to be
+between this minimum and maximum attribute.</dl>
+Attribute name="<b>PAL_VERSION</b>"
+<dl>This attribute is of type H5T_C_S1, with size corresponding to the
+length of the version string.&nbsp; This attribute identifies the version
+number of this specification to which it conforms.&nbsp; The initial version
+number is "1.0".</dl>
+
+<center><table BORDER=2 BGCOLOR="#FFFFFF" >
+<caption><b>Attributes of a Palette Dataset</b></caption>
+
+<tr>
+<td><b>Attribute Name</b></td>
+
+<td></td>
+
+<td><b>Type</b></td>
+
+<td><b>Value</b></td>
+</tr>
+
+<tr>
+<td>CLASS</td>
+
+<td>R</td>
+
+<td>String</td>
+
+<td>"PALETTE"</td>
+</tr>
+
+<tr>
+<td>PAL_COLORMODEL</td>
+
+<td>R</td>
+
+<td>String</td>
+
+<td>Color Model:&nbsp; "RGB", YUV", "CMY", "CMYK", "YCbCr", or "HSV"</td>
+</tr>
+
+<tr>
+<td>PAL_TYPE</td>
+
+<td>R</td>
+
+<td>String</td>
+
+<td>"STANDARD8" or "RANGEINDEX"</td>
+</tr>
+
+<tr>
+<td>RANGE_INDEX</td>
+
+<td>R<sup>1</sup></td>
+
+<td>Object Reference&nbsp;</td>
+
+<td>&lt;Object Reference to Dataset of range index values></td>
+</tr>
+
+<tr>
+<td>PAL_MINMAXNUMERIC</td>
+
+<td>O</td>
+
+<td>Array[2] of &lt;same datatype as palette></td>
+
+<td>The first value is the &lt;Minimum value for color values>, the second
+value is &lt;Maximum value for color values><sup>2</sup></td>
+</tr>
+
+<tr>
+<td>PAL_VERSION</td>
+
+<td>R</td>
+
+<td>String</td>
+
+<td>&lt;specification version number></td>
+</tr>
+</table></center>
+
+<dl><font size=-1>1.&nbsp; The RANGE_INDEX attribute is required if the
+PAL_TYPE is "RANGEINDEX".&nbsp; Otherwise, the RANGE_INDEX attribute should
+be omitted.</font>
+<br><font size=-1>2.&nbsp; The minimum and maximum are optional.&nbsp;
+If not set, the range is assumed to the maximum range of the number type.&nbsp;
+If one of these attributes is set, then both should be set.&nbsp; The value
+of the minumum must be less than or equal to the value of the maximum.</font></dl>
+</dl>
+
+<h3>
+2.3. Storage Layout for Palettes</h3>
+The values of the Palette are stored as a dataset.&nbsp; The datatype can
+be any HDF 5 atomic numeric type.&nbsp; The dataset will have dimensions
+(<tt>nentries</tt>&nbsp; by&nbsp; <tt>ncomponents</tt>), where '<tt>nentries</tt>'
+is the number of colors (usually 256) and '<tt>ncomponents'</tt> is the
+number of values per color (3 for <b>RGB</b>, 4 for <b>CMYK</b>, etc.)
+<br>&nbsp;
+<h2>
+3.&nbsp; Consistency and Correlation of Image and Palette Attributes</h2>
+The objects in this specification are an extension to the base HDF5 specification
+and library.&nbsp; They are accessible with the standard HDF5 library,
+but the semantics of the objects are not enforced by the base library.&nbsp;
+For example, it is perfectly possible to add an attribute called <b>IMAGE</b>
+to <i>any</i> dataset, or to include an object reference to <i>any</i>
+HDF5 dataset as a "palette" in a <b>PALETTE</b> attribute.&nbsp; this would
+be a perfectly valid HDF5 file, but not conformant to this specification.&nbsp;
+The rules defined in this specification must be implemented with appropriate
+software, and applications must use conforming software to assure correctness.
+<p>The Image and Palette specifications include several mutually redundant
+standard attributes, such as the <b>IMAGE_COLORMODEL</b> and the <b>PAL_COLORMODEL</b>.&nbsp;
+These attributes are informative not normative, in that it is acceptable
+to attach a Palette to an Image dataset even if their attributes do not
+match.&nbsp; Software is not required to enforce consistency, and files
+may contain mismatched associations of Images and Palettes.&nbsp; In all
+cases, it is up to applications to determine what kinds of images and color
+models can be supported.
+<p>For example, an Image that was created from a file with an "RGB" may
+have a "YUV" Palette in its <b>PALETTE</b> attribute array.&nbsp; This
+would be a legal HDF5 file and also a conforms to this specification, although
+it may or may not be correct or useable for a given application.
+<p>
+
+
+
+
+
+
+
+
+
+
+
+
+<hr>
+<center>
+<table border=0 width=98%>
+<tr><td valign=top align=left>
+ <a href="index.html">HDF5 documents and links</a>&nbsp;<br>
+ <a href="H5.intro.html">Introduction to HDF5</a>&nbsp;<br>
+ <a href="RM_H5Front.html">HDF5 Reference Manual</a>&nbsp;<br>
+ <!--
+ <a href="Glossary.html">Glossary</a><br>
+ -->
+</td>
+<td valign=top align=right>
+ <br>
+ <a href="H5.user.html">HDF5 User's Guide</a>&nbsp;<br>
+ <a href="ADGuide.html">HDF5 Application Developer's Guide</a>&nbsp;
+</td></tr>
+</table>
+</center>
+
+
+
+<hr>
+<address>
+<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
+</address>
+
+<!-- Created: Spring 1999 -->
+<!-- hhmts start -->
+Last modified: 2 June 2000
+<!-- hhmts end -->
+
+<br>
+Describes HDF5 Release 1.4 Beta, December 2000
+
+
+ </body>
+</html>
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