color space.htm

是一部关于java高级图像处理的的一本入门书

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        <B>API:</B> <CODE>javax.media.jai.FloatDoubleColorModel </CODE>
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<LI>FloatDoubleColorModel(ColorSpace colorSpace, boolean hasAlpha, 
       boolean isAlphaPremultiplied, int transparency, 
       int  transferType)
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    <DD>constructs a <CODE>FloatDoubleColorModel</CODE> from the specified 
    parameters.
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        <TD rowSpan=5><EM>Parameters</EM>:<EM></EM> 
          <P></P>
        <TD><CODE>colorSpace</CODE> 
          <P></P>
        <TD>The <CODE>ColorSpace</CODE> associated with this color model. See 
          <A 
          href="http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/Color.doc.html#51305">Section 
          5.2.2, "Color Space</A>." 
          <P></P>
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        <TD><CODE>hasAlpha</CODE> 
          <P></P>
        <TD>If true, this color model supports alpha. 
          <P></P>
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        <TD><CODE>isAlphaPremultiplied</CODE> 
          <P></P>
        <TD>If true, alpha is premultiplied. 
          <P></P>
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        <TD><CODE>transparency</CODE> 
          <P></P>
        <TD>Specifies what alpha values can be represented by this color 
          model. See <A 
          href="http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/Color.doc.html#51516">Section 
          5.3, "Transparency</A>." 
          <P></P>
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        <TD><CODE>transferType</CODE> 
          <P></P>
        <TD>Specifies the type of primitive array used to represent pixel 
          values. One of <CODE>DataBuffer.TYPE_FLOAT</CODE> or 
          <CODE>DataBuffer.TYPE_DOUBLE</CODE>. 
          <P></P></TR></TBODY></TABLE></A>
    <P></P></DD></DL><A name=51305>
  <H3>5.2.2 <IMG src="Color Space.files/space.gif">Color Space</H3></A>The 
  <CODE>ColorSpace</CODE> class represents a system for measuring colors, 
  typically using three or more separate numeric values. For example, RGB and 
  CMYK are color spaces. A <CODE>ColorSpace</CODE> object serves as a color 
  space tag that identifies the specific color space of a <CODE>Color</CODE> 
  object or, through a <CODE>ColorModel</CODE> object, of an <CODE>Image</CODE>, 
  <CODE>BufferedImage</CODE>, or <CODE>GraphicsConfiguration</CODE>. 
  <P><CODE>ColorSpace</CODE> provides methods that transform <CODE>Colors</CODE> 
  in a specific color space to and from <CODE>sRGB</CODE> and to and from a 
  well-defined <CODE>CIEXYZ</CODE> color space. All <CODE>ColorSpace</CODE> 
  objects must be able to map a color from the represented color space into 
  <CODE>sRGB</CODE> and transform an <CODE>sRGB</CODE> color into the 
  represented color space. 
  <P><A 
  href="http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/Color.doc.html#51319">Table 
  5-1</A> lists the variables used to refer to color spaces (such as 
  <CODE>CS_sRGB</CODE> and <CODE>CS_CIEXYZ</CODE>) and to color space types 
  (such as <CODE>TYPE_RGB</CODE> and <CODE>TYPE_CMYK</CODE>).
  <P>
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    <CAPTION><FONT size=-1><B><A name=51319><I>Table 5-1 </I><IMG 
    src="Color Space.files/sm-blank.gif" border=0> Color Space Types 
    </A></B></FONT></CAPTION>
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      <TH><A name=51323>Name </A>
      <TH><A name=51325>Description </A>
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      <TD><A name=51328>CS_CIEXYZ</A><BR>
      <TD><A name=51330>A widely-used, device-independent color standard 
        developed by the Commission Internationale de Eclairage (CIE), based on 
        color-matching experiments on human observers.</A><BR>
    <TR vAlign=top>
      <TD><A name=51333>CS_GRAY</A><BR>
      <TD><A name=51335>Grayscale color space.</A><BR>
    <TR vAlign=top>
      <TD><A name=51338>CS_LINEAR_RGB</A><BR>
      <TD><A name=51340>Linear RGB. Images that have not been previously 
        color-corrected.</A><BR>
    <TR vAlign=top>
      <TD><A name=51343>CS_PYCC</A><BR>
      <TD><A name=51345>PhotoCD YCC conversion color space. A 
        luminance/chrominance standard for Kodak PhotoCD images.</A><BR>
    <TR vAlign=top>
      <TD><A name=51348>CS_sRGB</A><BR>
      <TD><A name=51351>A proposed default "standard RGB" color standard for 
        use over the Internet.</A><BR>
    <TR vAlign=top>
      <TD><A name=51353>TYPE_2CLR</A><BR>
      <TD><A name=51355>A generic two-component color space.</A><BR>
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      <TD><A name=51357>TYPE_3CLR</A><BR>
      <TD><A name=51359>A generic three-component color space.</A><BR>
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      <TD><A name=51361>TYPE_4CLR</A><BR>
      <TD><A name=51363>A generic four-component color space.</A><BR>
    <TR vAlign=top>
      <TD><A name=51365>TYPE_5CLR</A><BR>
      <TD><A name=51367>A generic five-component color space.</A><BR>
    <TR vAlign=top>
      <TD><A name=51369>TYPE_6CLR</A><BR>
      <TD><A name=51371>A generic six-component color space.</A><BR>
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      <TD><A name=51373>TYPE_7CLR</A><BR>
      <TD><A name=51375>A generic seven-component color space.</A><BR>
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      <TD><A name=51377>TYPE_8CLR</A><BR>
      <TD><A name=51379>A generic eight-component color space.</A><BR>
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      <TD><A name=51381>TYPE_9CLR</A><BR>
      <TD><A name=51383>A generic nine-component color space.</A><BR>
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      <TD><A name=51385>TYPE_ACLR</A><BR>
      <TD><A name=51387>A generic 10-component color space.</A><BR>
    <TR vAlign=top>
      <TD><A name=51389>TYPE_BCLR</A><BR>
      <TD><A name=51391>A generic 11-component color space.</A><BR>
    <TR vAlign=top>
      <TD><A name=51393>TYPE_CCLR</A><BR>
      <TD><A name=51395>A generic 12-component color space.</A><BR>
    <TR vAlign=top>
      <TD><A name=51397>TYPE_CMY</A><BR>
      <TD><A name=51399>Any of the family of CMY color spaces.</A><BR>
    <TR vAlign=top>
      <TD><A name=51401>TYPE_CMYK</A><BR>
      <TD><A name=51403>Any of the family of CMYK color spaces.</A><BR>
    <TR vAlign=top>
      <TD><A name=51405>TYPE_DCLR</A><BR>
      <TD><A name=51407>Generic 13-component color spaces.</A><BR>
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      <TD><A name=51409>TYPE_ECLR</A><BR>
      <TD><A name=51411>Generic 14-component color spaces.</A><BR>
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      <TD><A name=51413>TYPE_FCLR</A><BR>
      <TD><A name=51415>Generic 15-component color spaces.</A><BR>
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      <TD><A name=51417>TYPE_GRAY</A><BR>
      <TD><A name=51419>Any of the family of GRAY color spaces.</A><BR>
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      <TD><A name=51421>TYPE_HLS</A><BR>
      <TD><A name=51423>Any of the family of HLS color spaces.</A><BR>
    <TR vAlign=top>
      <TD><A name=51425>TYPE_HSV</A><BR>
      <TD><A name=51427>Any of the family of HSV color spaces.</A><BR>
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      <TD><A name=51429>TYPE_Lab</A><BR>
      <TD><A name=51431>Any of the family of Lab color spaces.</A><BR>
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      <TD><A name=51433>TYPE_Luv</A><BR>
      <TD><A name=51435>Any of the family of Luv color spaces.</A><BR>
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      <TD><A name=51437>TYPE_RGB</A><BR>
      <TD><A name=51439>Any of the family of RGB color spaces.</A><BR>
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      <TD><A name=51441>TYPE_XYZ</A><BR>
      <TD><A name=51443>Any of the family of XYZ color spaces.</A><BR>
    <TR vAlign=top>
      <TD><A name=51445>TYPE_YCbCr</A><BR>
      <TD><A name=51447>Any of the family of YCbCr color spaces.</A><BR>
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      <TD><A name=51449>TYPE_Yxy</A><BR>
      <TD><A name=51451>Any of the family of Yxy color 
  spaces.</A><BR></TR></TBODY></TABLE>
  <P>Conversion between Java color spaces is simplified by a set of methods that 
  map a color from a represented color space to either sRGB or CIEXYZ and 
  transform a sRGB or CIEXYZ color space to the represented color space. There 
  are four methods: 
  <P>
  <UL>
    <LI>The <CODE>toRGB</CODE> method transforms a <CODE>Color</CODE> in the 
    represented color space to a <CODE>Color</CODE> in sRGB.
    <P></P></LI></UL>
  <UL>
    <LI>The <CODE>toCIEXYZ</CODE> method transforms a <CODE>Color</CODE> in the 
    represented color space to a <CODE>Color</CODE> in CIEXYZ.
    <P></P></LI></UL>
  <UL>
    <LI>The <CODE>fromRGB</CODE> method takes a <CODE>Color</CODE> in sRGB and 
    transforms into the represented color space.
    <P></P></LI></UL>
  <UL>
    <LI>The <CODE>fromCIEXYZ</CODE> method takes a <CODE>Color</CODE> in CIEXYZ 
    and transforms into the represented color space.
    <P></P></LI></UL>The sRGB (which stands for "standard" RGB) color space is 
  provided as a convenience to programmers, since many applications are 
  primarily concerned with RGB images. Defining a standard RGB color space makes 
  writing such applications easier. The <CODE>toRGB</CODE> and 
  <CODE>fromRGB</CODE> methods are provided so that developers can easily 
  retrieve colors in this standard space. However, the sRGB color space is not 
  intended for use with highly accurate color correction or conversions. 
  <P>The sRGB color space is somewhat limited in that it cannot represent every 
  color in the full gamut (spectrum of representable colors) of CIEXYZ color. If 
  a color is specified in some space that has a different gammut than sRGB, 
  using sRGB as an intermediate color space results in a loss of information. 
  The CIEXYZ color space is used as an intermediate color space to avoid any 
  loss of color quality. The CIEXYZ color space is known as the <EM>conversion 
  space</EM> for this reason. The <CODE>toCIEXYZ</CODE> and 
  <CODE>fromCIEXYZ</CODE> methods support conversions between any two color 
  spaces at a reasonably high degree of accuracy, one color at a time. 
  <P>
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        <B>API:</B> <CODE>java.awt.color.ColorSpace </CODE>
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<LI>abstract float[] toRGB(float[] colorvalue)
<P></P></LI></UL></PRE>
  <DL><A name=51468>
    <DT>
    <DD>transforms a color value assumed to be in this <CODE>ColorSpace</CODE> 
    into a value in the default <CODE>CS_sRGB</CODE> color space.
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        <TD><EM>Parameter</EM>:<EM></EM> 
          <P></P>
        <TD><CODE>colorvalue</CODE> 
          <P></P>
        <TD>A float array with length of at least the number of components in 
          this <CODE>ColorSpace</CODE>.<CODE></CODE> 
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<LI>abstract float[] fromRGB(float[] rgbvalue)
<P></P></LI></UL></PRE>
  <DL><A name=51477>
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    <DD>transforms a color value assumed to be in the default 
    <CODE>CS_sRGB</CODE> color space into this <CODE>ColorSpace</CODE>.
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        <TD><EM>Parameter</EM>: 
          <P></P>
        <TD><CODE>rgbvalue</CODE> 
          <P></P>
        <TD>A float array with length of at least 3. 
          <P></P></TR></TBODY></TABLE></A>
    <P></P></DD></DL><PRE><UL>
<LI>abstract float[] toCIEXYZ(float[] colorvalue)
<P></P></LI></UL></PRE>
  <DL><A name=51486>
    <DT>
    <DD>transforms a color value assumed to be in this <CODE>ColorSpace</CODE> 
    into the <CODE>CS_CIEXYZ</CODE> conversion color space. </A>
    <P></P></DD></DL><PRE><UL>
<LI>abstract float[] fromCIEXYZ(float[] colorvalue)