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1 .TH PNG 5 "February 23, 2024"
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2 .SH NAME
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3 png \- Portable Network Graphics (PNG) format
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4
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5 .SH DESCRIPTION
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6 PNG (Portable Network Graphics) is an extensible file format for the
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7 lossless, portable, well-compressed storage of raster images. PNG
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8 provides a patent-free replacement for GIF, and can also replace many
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9 common uses of TIFF. Indexed-color, grayscale, and truecolor images are
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10 supported, plus an optional alpha channel. Sample depths range from
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11 1 to 16 bits.
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12 .br
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13 PNG is designed to work well in online viewing applications, such
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14 as the World Wide Web, so it is fully streamable with a progressive
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15 display option. PNG is robust, providing both full file integrity
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16 checking and fast, simple detection of common transmission errors.
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17 Also, PNG can store gamma and chromaticity data for improved color
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18 matching on heterogeneous platforms.
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19
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20 .SH "SEE ALSO"
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21 .BR "libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
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22 .LP
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23 PNG Specification (Second Edition), November 2003:
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24 .IP
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25 .br
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26 https://www.w3.org/TR/2003/REC-PNG-20031110/
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27 .LP
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28 PNG 1.2 Specification, July 1999:
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29 .IP
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30 .br
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31 https://png-mng.sourceforge.io/pub/png/spec/1.2/
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32 .LP
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33 PNG 1.0 Specification, October 1996:
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34 .IP
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35 .br
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36 RFC 2083
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37 .br
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38 https://www.ietf.org/rfc/rfc2083.txt
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39 .IP
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40 .br
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41 or W3C Recommendation
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42 .br
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43 https://www.w3.org/TR/REC-png-961001
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44
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45 .SH AUTHORS
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46 This man page: Glenn Randers-Pehrson, Cosmin Truta
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47 .LP
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48 Portable Network Graphics (PNG) Specification (Second Edition)
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49 Information technology - Computer graphics and image processing -
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50 Portable Network Graphics (PNG): Functional specification.
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51 ISO/IEC 15948:2003 (E) (November 10, 2003): David Duce and others.
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52 .LP
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53 Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999):
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54 Glenn Randers-Pehrson and others.
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55 .LP
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56 Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
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57 Thomas Boutell and others.
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58
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59 .\" end of man page
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