<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <HTML><HEAD><TITLE>Manpage of TIFFReadRGBAStrip</TITLE> </HEAD><BODY BGCOLOR=WHITE><FONT FACE="helvetica, sans, arial"> <H1>TIFFReadRGBAStrip</H1> Section: Misc. Reference Manual Pages (3T)<BR>Updated: December 10, 1998<BR><A HREF="#index">Index</A> <BR><A HREF="index.html">Return to Main Contents</A> <HR> <A NAME="lbAB"> </A> <H2>NAME</H2> TIFFReadRGBAStrip - read and decode an image strip into a fixed-format raster <A NAME="lbAC"> </A> <H2>SYNOPSIS</H2> <PRE> <B>#include <<A HREF="file:/usr/include/tiffio.h">tiffio.h</A>></B> <B>#define TIFFGetR(abgr) ((abgr) & 0xff)</B> <B>#define TIFFGetG(abgr) (((abgr) >> 8) & 0xff)</B> <B>#define TIFFGetB(abgr) (((abgr) >> 16) & 0xff)</B> <B>#define TIFFGetA(abgr) (((abgr) >> 24) & 0xff)</B> <B>int TIFFReadRGBAStrip(TIFF* tif, tstrip_t strip, uint32 * raster )</B> </PRE><A NAME="lbAD"> </A> <H2>DESCRIPTION</H2> <I>TIFFReadRGBAStrip</I> reads a single strip of a strip-based image into memory, <BR> storing the result in the user supplied RGBA <I>raster</I>. The raster is assumed to be an array of width times rowsperstrip 32-bit entries, where width is the width of the image (TIFFTAG_IMAGEWIDTH) and rowsperstrip is the maximum lines in a strip (TIFFTAG_ROWSPERSTRIP). <P> <P> The <I>strip</I> value should be the strip number (strip zero is the first) as returned by the <I>TIFFComputeStrip</I> function, but always for sample 0. <P> <P> Note that the raster is assume to be organized such that the pixel at location (<I>x</I>,<I>y</I>) is <I>raster</I>[<I>y</I>*<I>width</I>+<I>x</I>]; with the raster origin in the <I>lower-left hand corner</I> of the strip. That is bottom to top organization. When reading a partial last strip in the file the last line of the image will begin at the beginning of the buffer. <P> <P> Raster pixels are 8-bit packed red, green, blue, alpha samples. The macros <I>TIFFGetR</I>, <I>TIFFGetG</I>, <I>TIFFGetB</I>, and <I>TIFFGetA</I> should be used to access individual samples. Images without Associated Alpha matting information have a constant Alpha of 1.0 (255). <P> See the <I><A HREF="TIFFRGBAImage.3t.html">TIFFRGBAImage</A></I>(3T) page for more details on how various image types are converted to RGBA values. <A NAME="lbAE"> </A> <H2>NOTES</H2> 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</I> minus <I>ExtraSamples</I>). <P> Palette image colormaps that appear to be incorrectly written as 8-bit values are automatically scaled to 16-bits. <P> <I>TIFFReadRGBAStrip</I> is just a wrapper around the more general <I><A HREF="TIFFRGBAImage.3t.html">TIFFRGBAImage</A></I>(3T) facilities. It's main advantage over the similar <I>TIFFReadRGBAImage()</I> function is that for large images a single buffer capable of holding the whole image doesn't need to be allocated, only enough for one strip. The <I>TIFFReadRGBATile()</I> function does a similar operation for tiled images. <A NAME="lbAF"> </A> <H2>RETURN VALUES</H2> 1 is returned if the image was successfully read and converted. Otherwise, 0 is returned if an error was encountered. <A NAME="lbAG"> </A> <H2>DIAGNOSTICS</H2> All error messages are directed to the <I><A HREF="TIFFError.3t.html">TIFFError</A></I>(3T) routine. <P> <B>Sorry, can not handle %d-bit pictures</B>. The image had <I>BitsPerSample</I> other than 1, 2, 4, 8, or 16. <P> <B>Sorry, can not handle %d-channel images</B>. The image had <I>SamplesPerPixel</I> other than 1, 3, or 4. <P> <B>Missing needed "PhotometricInterpretation" tag</B>. The image did not have a tag that describes how to display the data. <P> <B>No "PhotometricInterpretation" tag, assuming RGB</B>. 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 <FONT SIZE="-1">RGB.</FONT> <P> <B>No "PhotometricInterpretation" tag, assuming min-is-black</B>. 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. <P> <B>No space for photometric conversion table</B>. There was insufficient memory for a table used to convert image samples to 8-bit <FONT SIZE="-1">RGB.</FONT> <P> <B>Missing required "Colormap" tag</B>. A Palette image did not have a required <I>Colormap</I> tag. <P> <B>No space for tile buffer</B>. There was insufficient memory to allocate an i/o buffer. <P> <B>No space for strip buffer</B>. There was insufficient memory to allocate an i/o buffer. <P> <B>Can not handle format</B>. The image has a format (combination of <I>BitsPerSample</I>, <I>SamplesPerPixel</I>, and <I>PhotometricInterpretation</I>) that <I>TIFFReadRGBAImage</I> can not handle. <P> <B>No space for B&W mapping table</B>. There was insufficient memory to allocate a table used to map grayscale data to <FONT SIZE="-1">RGB.</FONT> <P> <B>No space for Palette mapping table</B>. There was insufficient memory to allocate a table used to map data to 8-bit <FONT SIZE="-1">RGB.</FONT> <A NAME="lbAH"> </A> <H2>BUGS</H2> Orientations other than bottom-left, or top-left are not handled correctly. <A NAME="lbAI"> </A> <H2>SEE ALSO</H2> <I><A HREF="libtiff.3t.html">libtiff</A></I>(3T), <I><A HREF="TIFFOpen.3t.html">TIFFOpen</A></I>(3T), <I><A HREF="TIFFRGBAImage.3t.html">TIFFRGBAImage</A></I>(3T), <I><A HREF="TIFFReadRGBAImage.3t.html">TIFFReadRGBAImage</A></I>(3T), <I><A HREF="TIFFReadRGBATile.3t.html">TIFFReadRGBATile</A></I>(3T) <HR> <A NAME="index"> </A><H2>Index</H2> <DL> <DT><A HREF="#lbAB">NAME</A><DD> <DT><A HREF="#lbAC">SYNOPSIS</A><DD> <DT><A HREF="#lbAD">DESCRIPTION</A><DD> <DT><A HREF="#lbAE">NOTES</A><DD> <DT><A HREF="#lbAF">RETURN VALUES</A><DD> <DT><A HREF="#lbAG">DIAGNOSTICS</A><DD> <DT><A HREF="#lbAH">BUGS</A><DD> <DT><A HREF="#lbAI">SEE ALSO</A><DD> </DL> <HR> This document was created by <A HREF="index.html">man2html</A>, using the manual pages.<BR> Time: 01:31:38 GMT, November 23, 1999 </BODY> </HTML>
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