1IM_PNG(3)                  Library Functions Manual                  IM_PNG(3)
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NAME

6       im_png2vips,  im_png2vips_header,  im_png2vips  - convert PNG images to
7       and from VIPS format
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SYNOPSIS

10       #include <vips/vips.h>
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12       int im_png2vips( const char *filename, IMAGE *out )
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14       int im_png2vips_header( const char *filename, IMAGE *out )
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16       int im_vips2png( IMAGE *in, const char *filename )
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DESCRIPTION

20       im_png2vips() reads the png image in filename, and writes the image out
21       in VIPS format.
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23       im_png2vips_header()  reads  just  the  header information from the PNG
24       file. You can't read any pixels!
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26       im_vips2png() reads the image in and writes a PNG file to the specified
27       filename. The filename may include an optional mode string, following a
28       ':' character, which you can use to specify compression and interlace.
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30       The mode string has the following syntax:
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32         <compression>,<interlace>
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34       where <compression> is an integer between 0 and 9 specifying the amount
35       of  compression  (6 is the default), and <interlace> is 0 for no inter‐
36       lace (this is the default) and 1 for ADAM7 interlace.
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38       Beware that writing an interlaced image is potentially up  to  7  times
39       slower than writing a non-interlaced image.
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EXAMPLES

43       The call:
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45          im_vips2png fred.v fred.png
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47       Writes a compression 6, uninterlaced PNG image.
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49          im_vips2png fred.v fred.tif:,1
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51       Writes an interlaced image.
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SEE ALSO

55       im_ispng(3), im_vips2tiff(3)
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58       Hey, you want this? You have it!
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62                                  3 Jan 2003                         IM_PNG(3)
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