BMP 元数据格式规范

本机图像元数据格式的 XML 模式如下：

<?xml version="1.0" encoding="UTF-8"?>

<!-- Schema for BMP native image metadata format. -->

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
      xmlns="http://javax.imageio.plugins"
      targetNamespace="http://javax.imageio.plugins">

 <!-- Coordinates of a point in the CIE XYZ color space. -->
 <xsd:complexType name="XYZPoint">
  <xsd:sequence>
   <xsd:element name="X" type="xsd:double"/>
   <xsd:element name="Y" type="xsd:double"/>
   <xsd:element name="Z" type="xsd:double"/>
  </xsd:sequence>
 </xsd:complexType>

 <!-- BMP Schema 1.0 root element. -->
 <xsd:element name="javax_imageio_bmp_1.0">
  <xsd:complexType>
   <xsd:sequence>

    <!-- BMP version string -->
    <xsd:element name="BMPVersion" type="xsd:string"/>

    <!-- Bitmap width -->
    <xsd:element name="Width" type="xsd:unsignedInt"/>

    <!-- Bitmap height -->
    <xsd:element name="Height" type="xsd:unsignedInt"/>

    <!-- Number of bits per pixel -->
    <xsd:element name="BitsPerPixel" type="xsd:unsignedShort"/>

    <!-- Compression type -->
    <xsd:element name="Compression" type="xsd:unsignedInt" minOccurs="0"/>

    <!-- Image size in bytes -->
    <xsd:element name="ImageSize" type="xsd:unsignedInt" minOccurs="0"/>

    <!-- Resolution in pixels per unit distance -->
    <xsd:element name="PixelsPerMeter" minOccurs="0">
     <xsd:complexType>
      <xsd:sequence>
       <xsd:element name="X" type="xsd:unsignedInt"/>
       <xsd:element name="Y" type="xsd:unsignedInt"/>
      </xsd:sequence>
     </xsd:complexType>
    </xsd:element> <!-- PixelsPerMeter -->


    <!-- Number of color indexes in the color table actually used -->
    <xsd:element name="ColorsUsed" type="xsd:unsignedInt" minOccurs="0"/>

    <!-- Number of color indexes considered important for display -->
    <xsd:element name="ColorsImportant" type="xsd:unsignedInt"
           minOccurs="0"/>

    <!-- Color masks; present for BI_BITFIELDS compression only -->
    <xsd:element name="Mask" minOccurs="0">
     <xsd:complexType>
      <xsd:sequence>
       <xsd:element name="Red" type="xsd:unsignedInt"/>
       <xsd:element name="Green" type="xsd:unsignedInt"/>
       <xsd:element name="Blue" type="xsd:unsignedInt"/>
       <xsd:element name="Alpha" type="xsd:unsignedInt" minOccurs="0"/>
      </xsd:sequence>
     </xsd:complexType>
    </xsd:element>

    <!-- Color space -->
    <xsd:element name="ColorSpaceType" type="xsd:unsignedInt"
           minOccurs="0"/>

    <!-- CIE XYZ for the LCS_CALIBRATED_RGB color space -->
    <xsd:element name="CIEXYZEndpoints" minOccurs="0">
     <xsd:complexType>
      <xsd:sequence>
       <xsd:element name="Red" type="XYZPoint"/>
       <xsd:element name="Green" type="XYZPoint"/>
       <xsd:element name="Blue" type="XYZPoint"/>
      </xsd:sequence>
     </xsd:complexType>
    </xsd:element>

    <!-- Gamma values for the LCS_CALIBRATED_RGB color space -->
    <xsd:element name="Gamma" minOccurs="0">
     <xsd:complexType>
      <xsd:sequence>
       <xsd:element name="Red" type="xsd:unsignedInt"/>
       <xsd:element name="Green" type="xsd:unsignedInt"/>
       <xsd:element name="Blue" type="xsd:unsignedInt"/>
      </xsd:sequence>
     </xsd:complexType>
    </xsd:element>

    <!-- Rendering intent -->
    <xsd:element name="Intent" type="xsd:unsignedInt" minOccurs="0"/>

    <!-- The image colormap -->
    <xsd:element name="Palette" minOccurs="0">
     <xsd:complexType>
      <xsd:sequence>
       <xsd:element name="PaletteEntry">
        <xsd:complexType>
         <xsd:sequence>
          <xsd:element name="Red" type="xsd:unsignedByte"/>
          <xsd:element name="Green" type="xsd:unsignedByte"/>
          <xsd:element name="Blue" type="xsd:unsignedByte"/>
          <xsd:element name="Alpha" type="xsd:unsignedByte" minOccurs="0"/>
         </xsd:sequence>
        </xsd:complexType>
       </xsd:element>
      </xsd:sequence>
     </xsd:complexType>
    </xsd:element>

   </xsd:sequence>
  </xsd:complexType>
 </xsd:element> <!-- bmp_image_1.0 -->

</xsd:schema>

自从：

1.5