<?xml version="1.0" encoding="UTF-8"?>
<ufwb version="1.3.1">
<grammar name="PNG Images" start="id:45" author="Andreas Pehnack" fileextension="png" uti="public.png">
<description>Grammar for the popular PNG image file format</description>
<structure name="Defaults" id="46" encoding="ISO_8859-1:1987" endian="big" signed="no">
<description>
Defines the default values.
</description>
</structure>
<structure name="Header" id="48" extends="id:46" encoding="ISO_8859-1:1987" endian="big" signed="no">
<binary name="Eye catcher" mustmatch="yes" id="49" fillcolor="DE83F7" length="8">
<fixedvalues>
<fixedvalue name="Eye catcher" value="89504E470D0A1A0A"/>
</fixedvalues>
</binary>
</structure>
<structure name="Chunk" id="51" extends="id:46" encoding="ISO_8859-1:1987" endian="big" signed="no">
<number name="Length" id="52" fillcolor="54FA8A" type="integer" length="4"/>
<number name="Type" mustmatch="yes" id="53" fillcolor="68D6FB" type="integer" length="4" display="hex"/>
<structure name="Data" id="54" length="prev.Length" fillcolor="FEFB8C"/>
<binary name="CRC" id="56" fillcolor="FFD385" length="4"/>
</structure>
<structure name="IHDR" id="58" extends="id:51">
<number name="Length" id="59" type="integer"/>
<number name="Type" id="60" type="integer">
<fixedvalues>
<fixedvalue name="IHDR" value="0x49484452"/>
</fixedvalues>
</number>
<structure name="Data" id="61">
<number name="Width" id="62" type="integer" length="4"/>
<number name="Height" id="63" type="integer" length="4"/>
<number name="Bit depth" id="64" type="integer" length="1">
<fixedvalues>
<fixedvalue value="1"></fixedvalue>
<fixedvalue value="2"></fixedvalue>
<fixedvalue value="4"></fixedvalue>
<fixedvalue value="8"></fixedvalue>
<fixedvalue value="16"></fixedvalue>
</fixedvalues>
</number>
<number name="Color type" id="65" type="integer" length="1">
<fixedvalues>
<fixedvalue name="Type0" value="0">
<description>
Each pixel is a grayscale sample.
</description>
</fixedvalue>
<fixedvalue name="Type2" value="2">
<description>
Each pixel is an R,G,B triple.
</description>
</fixedvalue>
<fixedvalue name="Type3" value="3">
<description>
Each pixel is a palette index; a PLTE chunk must appear.
</description>
</fixedvalue>
<fixedvalue name="Type4" value="4">
<description>
Each pixel is a grayscale sample, followed by an alpha sample.
</description>
</fixedvalue>
<fixedvalue name="Type6" value="6">
<description>
Each pixel is an R,G,B triple, followed by an alpha sample.
</description>
</fixedvalue>
</fixedvalues>
</number>
<number name="Compression method" id="66" type="integer" length="1">
<fixedvalues>
<fixedvalue name="deflate/inflate" value="0">
<description>
deflate/inflate compression with a sliding window of at most 32768 bytes
</description>
</fixedvalue>
</fixedvalues>
</number>
<number name="Filter method" id="67" type="integer" length="1">
<fixedvalues>
<fixedvalue name="Adaptive" value="0"/>
</fixedvalues>
</number>
<number name="Interlace method" id="68" type="integer" length="1">
<fixedvalues>
<fixedvalue name="No interlace" value="0"/>
<fixedvalue name="Adam7 interlace" value="1"/>
</fixedvalues>
</number>
</structure>
<binary name="CRC" id="70"/>
</structure>
<structure name="tIME" id="72" extends="id:51">
<number name="Length" id="73" type="integer"/>
<number name="Type" id="74" type="integer">
<fixedvalues>
<fixedvalue value="0x74494D45"/>
</fixedvalues>
</number>
<structure name="Data" id="75">
<number name="Year" id="76" type="integer" length="2"/>
<number name="Month" id="77" type="integer" length="1"/>
<number name="Day" id="78" type="integer" length="1"/>
<number name="Hour" id="79" type="integer" length="1"/>
<number name="Minute" id="80" type="integer" length="1"/>
<number name="Second" id="81" type="integer" length="1"/>
</structure>
<binary name="CRC" id="83"/>
</structure>
<structure name="tEXt" id="85" extends="id:51" floating="yes">
<number name="Length" id="86" type="integer"/>
<number name="Type" id="87" type="integer">
<fixedvalues>
<fixedvalue value="0x74455874"/>
</fixedvalues>
</number>
<structure name="Data" id="88">
<string name="Key" id="89" type="zero-terminated"/>
<string name="Text" id="90" type="zero-terminated"/>
</structure>
<binary name="CRC" id="92"/>
</structure>
<structure name="zTXt" id="94" extends="id:51" floating="yes">
<number name="Length" id="95" type="integer"/>
<number name="Type" id="96" type="integer">
<fixedvalues>
<fixedvalue value="0x7A545874"/>
</fixedvalues>
</number>
<structure name="Data" id="97">
<string name="Key" id="98" type="zero-terminated"/>
<number name="Compression method" id="99" type="integer" length="1">
<fixedvalues>
<fixedvalue name="zlib with deflate" value="0"><description>zlib datastream with deflate compression</description></fixedvalue>
</fixedvalues>
</number>
<binary name="Compressed Text" id="100" length="remaining"/>
</structure>
<binary name="CRC" id="102"/>
</structure>
<structure name="iTXt" id="104" extends="id:51" floating="yes">
<number name="Length" id="105" type="integer"/>
<number name="Type" id="106" type="integer">
<fixedvalues>
<fixedvalue value="0x69545874"/>
</fixedvalues>
</number>
<structure name="Data" id="107">
<string name="Key" id="108" type="zero-terminated"/>
<number name="Compression flag" id="109" type="integer" length="1">
<fixedvalues>
<fixedvalue name="Uncompressed" value="0"><description>Uncompressed text</description></fixedvalue>
<fixedvalue name="Compressed" value="1"><description>Compressed text</description></fixedvalue>
</fixedvalues>
</number>
<number name="Compression method" id="110" type="integer" length="1">
<fixedvalues>
<fixedvalue name="zlib with deflate" value="0"><description>zlib datastream with deflate compression</description></fixedvalue>
</fixedvalues>
</number>
<string name="Language tag" id="111" type="zero-terminated"/>
<string name="Translated keyword" id="112" type="zero-terminated"/>
<string name="Text" id="113" type="zero-terminated"/>
</structure>
<binary name="CRC" id="115"/>
</structure>
<structure name="iCCP" id="117" extends="id:51">
<number name="Length" id="118" type="integer"/>
<number name="Type" id="119" type="integer">
<fixedvalues>
<fixedvalue value="0x69434350"/>
</fixedvalues>
</number>
<structure name="Data" id="120">
<string name="Profile name" id="121" type="zero-terminated"/>
<number name="Compression method" id="122" type="integer" length="1">
<fixedvalues>
<fixedvalue name="zlib with deflate" value="0"><description>zlib datastream with deflate compression</description></fixedvalue>
</fixedvalues>
</number>
<number name="Compressed profile" id="123" type="integer" length="1"/>
</structure>
<binary name="CRC" id="125"/>
</structure>
<structure name="tRNS" id="127" extends="id:51">
<number name="Length" id="128" type="integer"/>
<number name="Type" id="129" type="integer">
<fixedvalues>
<fixedvalue value="0x74524E53"/>
</fixedvalues>
</number>
<structure name="Data" id="130">
<structure name="Color" id="131" repeatmax="unlimited">
<number name="Red" id="132" type="integer" length="1"/>
<number name="Green" id="133" type="integer" length="1"/>
<number name="Blue" id="134" type="integer" length="1"/>
</structure>
</structure>
<binary name="CRC" id="137"/>
</structure>
<structure name="gAMA" id="139" extends="id:51">
<number name="Length" id="140" type="integer"/>
<number name="Type" id="141" type="integer">
<fixedvalues>
<fixedvalue value="0x67414D41"/>
</fixedvalues>
</number>
<structure name="Data" id="142">
<number name="Gamma" id="143" type="integer" length="4"/>
</structure>
<binary name="CRC" id="145"/>
</structure>
<structure name="cHRM" id="147" extends="id:51">
<description>
Applications that need device-independent specification of colors in a PNG file can use the cHRM chunk to specify the 1931 CIE x,y chromaticities of the red, green, and blue primaries used in the image, and the referenced white point
</description>
<number name="Length" id="148" type="integer"/>
<number name="Type" id="149" type="integer">
<fixedvalues>
<fixedvalue value="0x6348524D"/>
</fixedvalues>
</number>
<structure name="Data" id="150">
<number name="White Point x" id="151" type="integer" length="4"/>
<number name="White Point y" id="152" type="integer" length="4"/>
<number name="Red x" id="153" type="integer" length="4"/>
<number name="Red y" id="154" type="integer" length="4"/>
<number name="Green x" id="155" type="integer" length="4"/>
<number name="Green y" id="156" type="integer" length="4"/>
<number name="Blue x" id="157" type="integer" length="4"/>
<number name="Blue y" id="158" type="integer" length="4"/>
</structure>
<binary name="CRC" id="160"/>
</structure>
<structure name="PLTE" id="162" extends="id:51">
<number name="Length" id="163" type="integer"/>
<number name="Type" id="164" type="integer">
<fixedvalues>
<fixedvalue value="0x504C5445"/>
</fixedvalues>
</number>
<structure name="Data" id="165">
<structure name="Color" id="166" repeatmax="unlimited">
<number name="Red" id="167" fillcolor="FF0000" type="integer" length="1"/>
<number name="Green" id="168" fillcolor="00FF00" type="integer" length="1"/>
<number name="Blue" id="169" fillcolor="0000FF" type="integer" length="1"/>
</structure>
</structure>
<binary name="CRC" id="172"/>
</structure>
<structure name="hIST" id="174" extends="id:51">
<number name="Length" id="175" type="integer"/>
<number name="Type" id="176" type="integer">
<fixedvalues>
<fixedvalue value="0x68495354"/>
</fixedvalues>
</number>
<structure name="Data" id="177">
<number name="Count" id="178" type="integer" length="2" repeatmax="unlimited"/>
</structure>
<binary name="CRC" id="180"/>
</structure>
<structure name="bKGD" id="182" extends="id:51">
<number name="Length" id="183" type="integer"/>
<number name="Type" id="184" type="integer">
<fixedvalues>
<fixedvalue value="0x624B4744"/>
</fixedvalues>
</number>
<structure name="Data" id="185">
<binary name="Color Data" id="186" length="remaining"/>
</structure>
<binary name="CRC" id="187"/>
</structure>
<structure name="pHYs" id="189" extends="id:51">
<number name="Length" id="190" type="integer"/>
<number name="Type" id="191" type="integer">
<fixedvalues>
<fixedvalue value="0x70485973"/>
</fixedvalues>
</number>
<structure name="Data" id="192">
<number name="Pixels per unit, x axis" id="193" type="integer" length="4"/>
<number name="Pixels per unit, y axis" id="194" type="integer" length="4"/>
<number name="Unit specifier" id="195" type="integer" length="1">
<fixedvalues>
<fixedvalue name="unit is unknown" value="0"/>
<fixedvalue name="unit is the metre" value="1"/>
</fixedvalues>
</number>
</structure>
<binary name="CRC" id="197"/>
</structure>
<structure name="sPLT" id="199" extends="id:51">
<number name="Length" id="200" type="integer"/>
<number name="Type" id="201" type="integer">
<fixedvalues>
<fixedvalue value="0x73504C54"/>
</fixedvalues>
</number>
<structure name="Data" id="202">
<string name="Palette name" id="203" type="zero-terminated"/>
<number name="Sample depth" id="204" type="integer" length="1"/>
<structure name="Color" id="205" repeatmax="unlimited">
<number name="Red" id="206" fillcolor="FF0000" type="integer" length="1"/>
<number name="Green" id="207" fillcolor="00FF00" type="integer" length="1"/>
<number name="Blue" id="208" fillcolor="0000FF" type="integer" length="1"/>
</structure>
</structure>
<binary name="CRC" id="211"/>
</structure>
<structure name="sRGB" id="213" extends="id:51" encoding="ISO_8859-1:1987" endian="big" signed="no">
<number name="Length" id="214" type="integer"/>
<number name="Type" id="215" type="integer" display="hex">
<fixedvalues>
<fixedvalue value="0x73524742"/>
</fixedvalues>
</number>
<binary name="CRC" id="218"/>
</structure>
<structure name="IDAT" id="220" extends="id:51">
<number name="Length" id="221" type="integer"/>
<number name="Type" id="222" type="integer">
<fixedvalues>
<fixedvalue value="0x49444154"/>
</fixedvalues>
</number>
<structure name="Data" id="223">
<binary name="Image Data" id="224" length="remaining"/>
</structure>
<binary name="CRC" id="226"/>
</structure>
<structure name="sBIT" id="228" extends="id:51">
<number name="Length" id="229" type="integer"/>
<number name="Type" id="230" type="integer">
<fixedvalues>
<fixedvalue value="0x73424954"/>
</fixedvalues>
</number>
<structure name="Data" id="231">
<binary name="SignificantBits" id="232" length="remaining"/>
</structure>
<binary name="CRC" id="234"/>
</structure>
<structure name="IEND" id="236" extends="id:51">
<number name="Length" id="237" type="integer"/>
<number name="Type" id="238" type="integer">
<fixedvalues>
<fixedvalue value="0x49454E44"/>
</fixedvalues>
</number>
<binary name="CRC" id="241"/>
</structure>
<structure name="PNG File" id="45" extends="id:46" consists-of="id:46" encoding="ISO_8859-1:1987" endian="big" signed="no">
<structref name="Header" id="243" structure="id:48"/>
<structref name="IHDR" id="244" structure="id:58"/>
<structure name="Chunks" id="245" repeatmax="unlimited" order="variable">
<structref name="tIME" id="246" repeatmin="0" structure="id:72"/>
<structref name="iCCP" id="247" repeatmin="0" structure="id:117"/>
<structref name="gAMA" id="248" repeatmin="0" structure="id:139"/>
<structref name="cHRM" id="249" repeatmin="0" structure="id:147"/>
<structref name="pHYs" id="250" repeatmin="0" structure="id:189"/>
<structref name="PLTE" id="251" repeatmin="0" structure="id:162"/>
<structref name="bKGD" id="252" repeatmin="0" structure="id:182"/>
<structref name="IDAT" id="253" repeatmin="0" repeatmax="unlimited" structure="id:220"/>
<structref name="iTXt" id="254" repeatmin="0" repeatmax="unlimited" structure="id:104"/>
<structref name="zTXt" id="255" repeatmin="0" repeatmax="unlimited" structure="id:94"/>
<structref name="tEXt" id="256" repeatmin="0" repeatmax="unlimited" structure="id:85"/>
<structref name="tRNS" id="257" repeatmin="0" structure="id:127"/>
<structref name="hIST" id="258" repeatmin="0" structure="id:174"/>
<structref name="sBIT" id="259" repeatmin="0" structure="id:228"/>
<structref name="sPLT" id="260" repeatmin="0" structure="id:199"/>
<structref name="sRGB" id="261" repeatmin="0" structure="id:213"/>
<structref name="IEND" id="262" repeatmin="0" structure="id:236"/>
<structref name="Chunk" id="263" structure="id:51"/>
</structure>
</structure>
</grammar>
</ufwb>