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