TIFFReadRGBAImage man page on BSDOS

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TIFFReadRGBAImage(3T)			    TIFFReadRGBAImage(3T)

NAME
       TIFFReadRGBAImage - read and decode an image into a fixed-
       format raster

SYNOPSIS
       #include <tiffio.h>
       #define TIFFGetR(abgr)	((abgr) & 0xff)
       #define TIFFGetG(abgr)	(((abgr) >> 8) & 0xff)
       #define TIFFGetB(abgr)	(((abgr) >> 16) & 0xff)
       #define TIFFGetA(abgr)	(((abgr) >> 24) & 0xff)
       int  TIFFReadRGBAImage(TIFF*  tif,  u_long  width,  u_long
height, u_long* raster, int stopOnError)

DESCRIPTION
       TIFFReadRGBAImage reads a strip- or tile-based image  into
       memory,	storing	 the  result in the user supplied raster.
       The raster is assumed to be an array of width times height
       32-bit  entries, where width must be less than or equal to
       the width of the image (height may be any non-zero  size).
       If  the	raster dimensions are smaller than the image, the
       image data is cropped to the raster bounds.  If the raster
       height  is  greater than that of the image, then the image
       data are placed in the lower part of  the  raster.   (Note
       that  the  raster  is assume to be organized such that the
       pixel at location (x,y)	is  raster[y*width+x];	with  the
       raster origin in the lower-left hand corner.)

       Raster  pixels  are  8-bit  packed red, green, blue, alpha
       samples.	 The macros  TIFFGetR,	TIFFGetG,  TIFFGetB,  and
       TIFFGetA	 should	 be  used  to  access individual samples.
       Images without Associated Alpha matting information have a
       constant Alpha of 1.0 (255).

       TIFFReadRGBAImage  converts  non-8-bit  images  by scaling
       sample values.  Palette,	 grayscale,  bilevel,  CMYK,  and
       YCbCr  images  are converted to RGB transparently.  Raster
       pixels are returned uncorrected by any colorimetry  infor-
       mation present in the directory.

       The paramater stopOnError specifies how to act if an error
       is encountered while reading the image.	If stopOnError is
       non-zero, then an error will terminate the operation; oth-
       erwise TIFFReadRGBAImage	 will  continue	 processing  data
       until  all  the	possible  data	in  the	 image	have been
       requested.

NOTES
       In C++ the stopOnError parameter defaults to 0.

       Samples must be either 1, 2, 4, 8, or 16 bits.  Colorimet-
       ric  samples/pixel  must	 be either 1, 3, or 4 (i.e.  Sam-
       plesPerPixel minus ExtraSamples).

       Palettte image colormaps that  appear  to  be  incorrectly
       written	as  8-bit  values  are	automatically  scaled  to

			February 14, 1992			1

TIFFReadRGBAImage(3T)			    TIFFReadRGBAImage(3T)

       16-bits.

       TIFFReadRGBAImage is just a wrapper around the  more  gen-
       eral TIFFRGBAImage(3T) facilities.

RETURN VALUES
       1  is returned if the image was successfully read and con-
       verted.	Otherwise, 0 is returned if an error was  encoun-
       tered and stopOnError is zero.

DIAGNOSTICS
       All  error messages are directed to the TIFFError(3T) rou-
       tine.

       Sorry, can not handle  %d-bit  pictures.	  The  image  had
       BitsPerSample other than 1, 2, 4, 8, or 16.

       Sorry,  can  not	 handle %d-channel images.  The image had
       SamplesPerPixel other than 1, 3, or 4.

       Missing needed "PhotometricInterpretation" tag.	The image
       did not have a tag that describes how to display the data.

       No "PhotometricInterpretation"  tag,  assuming  RGB.   The
       image  was missing a tag that describes how to display it,
       but because it has 3 or 4 samples/pixel, it is assumed  to
       be RGB.

       No "PhotometricInterpretation" tag, assuming min-is-black.
       The image was missing a tag that describes how to  display
       it, but because it has 1 sample/pixel, it is assumed to be
       a grayscale or bilevel image.

       No space for  photometric  conversion  table.   There  was
       insufficient memory for a table used to convert image sam-
       ples to 8-bit RGB.

       Missing required "Colormap" tag.	 A Palette image did  not
       have a required Colormap tag.

       No  space  for tile buffer.  There was insufficient memory
       to allocate an i/o buffer.

       No space for strip buffer.  There was insufficient  memory
       to allocate an i/o buffer.

       Can  not	 handle format.	 The image has a format (combina-
       tion of BitsPerSample, SamplesPerPixel, and PhotometricIn-
       terpretation) that TIFFReadRGBAImage can not handle.

       No  space  for  B&W mapping table.  There was insufficient
       memory to allocate a table used to map grayscale	 data  to
       RGB.

			February 14, 1992			2

TIFFReadRGBAImage(3T)			    TIFFReadRGBAImage(3T)

       No  space  for  Palette mapping table.  There was insuffi-
       cient memory to allocate a table used to map data to 8-bit
       RGB.

BUGS
       Orientations  other  than bottom-left, or top-left are not
       handled correctly.

SEE ALSO
       libtiff(3T), TIFFOpen(3T), TIFFRGBAImage(3T),  TIFFReadRG-
       BAStrip(3T), TIFFReadRGBATile(3T)

			February 14, 1992			3

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