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-.\" $Id: TIFFReadRGBAImage.3tiff,v 1.4 2006/10/13 07:22:01 dron Exp $
-.\"
-.\" Copyright (c) 1991-1997 Sam Leffler
-.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
-.\"
-.\" Permission to use, copy, modify, distribute, and sell this software and 
-.\" its documentation for any purpose is hereby granted without fee, provided
-.\" that (i) the above copyright notices and this permission notice appear in
-.\" all copies of the software and related documentation, and (ii) the names of
-.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
-.\" publicity relating to the software without the specific, prior written
-.\" permission of Sam Leffler and Silicon Graphics.
-.\" 
-.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
-.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
-.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
-.\" 
-.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
-.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
-.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
-.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
-.\" OF THIS SOFTWARE.
-.\"
-.if n .po 0
-.TH TIFFReadRGBAImage 3TIFF "October 13, 2006" "libtiff"
-.SH NAME
-TIFFReadRGBAImage, TIFFReadRGBAImageOriented \- read and decode an image
-into a fixed-format raster
-.SH SYNOPSIS
-.B "#include <tiffio.h>"
-.sp
-.B "#define TIFFGetR(abgr) ((abgr) & 0xff)"
-.br
-.B "#define TIFFGetG(abgr) (((abgr) >> 8) & 0xff)"
-.br
-.B "#define TIFFGetB(abgr) (((abgr) >> 16) & 0xff)"
-.br
-.B "#define TIFFGetA(abgr) (((abgr) >> 24) & 0xff)"
-.sp
-.BI "int TIFFReadRGBAImage(TIFF *" tif ", uint32 " width ", uint32 " height ", uint32 *" raster ", int " stopOnError ")"
-.br
-.BI "int TIFFReadRGBAImageOriented(TIFF *" tif ", uint32 " width ", uint32 " height ", uint32 *" raster ", int " orientation ", int " stopOnError ")"
-.br
-.SH DESCRIPTION
-.IR TIFFReadRGBAImage
-reads a strip- or tile-based image into memory, storing the
-result in the user supplied
-.IR raster .
-The raster is assumed to be an array of
-.I width
-times
-.I height
-32-bit entries, where
-.I width
-must be less than or equal to the width of the image (\c
-.I 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 (\fIx\fP,\fIy\fP) is \fIraster\fP[\fIy\fP*\fIwidth\fP+\fIx\fP];
-with the raster origin in the lower-left hand corner.)
-.PP
-.IR TIFFReadRGBAImageOriented
-works like
-.IR TIFFReadRGBAImage
-with except of that user can specify the raster origin position with the
-.I orientation
-parameter. Four orientations supported:
-.TP
-.B ORIENTATION_TOPLEFT
-origin in top-left corner,
-.TP
-.B ORIENTATION_TOPRIGHT
-origin in top-right corner,
-.TP
-.B ORIENTATION_BOTLEFT
-origin in bottom-left corner
-and
-.TP
-.B ORIENTATION_BOTRIGHT
-origin in bottom-right corner.
-.LP
-If you choose
-.B ORIENTATION_BOTLEFT
-result will be the same as returned by the
-.IR TIFFReadRGBAImage.
-.PP
-Raster pixels are 8-bit packed red, green, blue, alpha samples.
-The macros
-.IR TIFFGetR ,
-.IR TIFFGetG ,
-.IR TIFFGetB ,
-and
-.I TIFFGetA
-should be used to access individual samples.
-Images without Associated Alpha matting information have a constant
-Alpha of 1.0 (255).
-.PP
-.I TIFFReadRGBAImage
-converts non-8-bit images by scaling sample values.
-Palette, grayscale, bilevel, 
-.SM CMYK\c
-, and YCbCr images are converted to
-.SM RGB
-transparently.
-Raster pixels are returned uncorrected by any colorimetry information
-present in the directory.
-.PP
-The paramater
-.I stopOnError
-specifies how to act if an error is encountered while reading
-the image.
-If
-.I stopOnError
-is non-zero, then an error will terminate the operation; otherwise
-.I TIFFReadRGBAImage
-will continue processing data until all the possible data in the
-image have been requested.
-.SH NOTES
-In C++ the
-.I stopOnError
-parameter defaults to 0.
-.PP
-Samples must be either 1, 2, 4, 8, or 16 bits.
-Colorimetric samples/pixel must be either 1, 3, or 4 (i.e.
-.I SamplesPerPixel
-minus
-.IR ExtraSamples ).
-.PP
-Palettte image colormaps that appear to be incorrectly written
-as 8-bit values are automatically scaled to 16-bits.
-.PP
-.I TIFFReadRGBAImage
-is just a wrapper around the more general
-.IR TIFFRGBAImage (3TIFF)
-facilities.
-.SH "RETURN VALUES"
-1 is returned if the image was successfully read and converted.
-Otherwise, 0 is returned if an error was encountered and
-.I stopOnError
-is zero.
-.SH DIAGNOSTICS
-All error messages are directed to the
-.IR TIFFError (3TIFF)
-routine.
-.PP
-.BR "Sorry, can not handle %d-bit pictures" .
-The image had
-.I BitsPerSample
-other than 1, 2, 4, 8, or 16.
-.PP
-.BR "Sorry, can not handle %d-channel images" .
-The image had
-.I SamplesPerPixel
-other than 1, 3, or 4.
-.PP
-\fBMissing needed "PhotometricInterpretation" tag\fP.
-The image did not have a tag that describes how to display
-the data.
-.PP
-\fBNo "PhotometricInterpretation" tag, assuming RGB\fP.
-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
-.SM RGB.
-.PP
-\fBNo "PhotometricInterpretation" tag, assuming min-is-black\fP.
-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.
-.PP
-.BR "No space for photometric conversion table" .
-There was insufficient memory for a table used to convert
-image samples to 8-bit
-.SM RGB.
-.PP
-\fBMissing required "Colormap" tag\fP.
-A Palette image did not have a required
-.I Colormap
-tag.
-.PP
-.BR "No space for tile buffer" .
-There was insufficient memory to allocate an i/o buffer.
-.PP
-.BR "No space for strip buffer" .
-There was insufficient memory to allocate an i/o buffer.
-.PP
-.BR "Can not handle format" .
-The image has a format (combination of
-.IR BitsPerSample ,
-.IR SamplesPerPixel ,
-and
-.IR PhotometricInterpretation )
-that
-.I TIFFReadRGBAImage
-can not handle.
-.PP
-.BR "No space for B&W mapping table" .
-There was insufficient memory to allocate a table used to map
-grayscale data to
-.SM RGB.
-.PP
-.BR "No space for Palette mapping table" .
-There was insufficient memory to allocate a table used to map
-data to 8-bit
-.SM RGB.
-.SH "SEE ALSO"
-.BR TIFFOpen (3TIFF),
-.BR TIFFRGBAImage (3TIFF),
-.BR TIFFReadRGBAStrip (3TIFF),
-.BR TIFFReadRGBATile (3TIFF),
-.BR libtiff (3TIFF)
-.PP
-Libtiff library home page:
-.BR http://www.remotesensing.org/libtiff/