NAME

       TIFFReadRGBAStrip - read and decode an image strip into a fixed-format raster

SYNOPSIS

          #include <tiffio.h>

       int TIFFReadRGBAStrip(TIFF *tif, uint32_t row, uint32_t *raster)

       int TIFFReadRGBAStripExt(TIFF *tif, uint32_t row, uint32_t *raster, int stop_on_error)

DESCRIPTION

       TIFFReadRGBAStrip()  reads  a  single strip of a strip-based image into memory, storing the result in the
       user supplied RGBA raster.  The raster is assumed to be an array  of  ImageWidth  ×  RowsPerStrip  32-bit
       entries,  where ImageWidth is the width of the image (TIFFTAG_IMAGEWIDTH) and RowsPerStrip is the maximum
       lines in a strip (TIFFTAG_ROWSPERSTRIP).

       TIFFReadRGBAStripExt()  provides  the  paramater  stop_on_error.    Its   behaviour   is   described   at
       TIFFReadRGBAImage.

       The row value should be the row of the first row in the strip (strip × RowsPerStrip, zero based).

       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 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.

       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).

       See the TIFFRGBAImage page for more details on how various image types are converted to RGBA values.

NOTES

       Samples  must  be  either  1,  2, 4, 8, or 16 bits.  Colorimetric samples/pixel must be either 1, 3, or 4
       (i.e. SamplesPerPixel - ExtraSamples).

       Palette image colormaps that appear to be incorrectly written as 8-bit values are automatically scaled to
       16-bits.

       TIFFReadRGBAStrip() is just a wrapper around  the  more  general  TIFFRGBAImage  facilities.   It's  main
       advantage  over the similar TIFFReadRGBAImage() 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
       TIFFReadRGBATile() function does a similar operation for tiled images.

RETURN VALUES

       1 is returned if the image was successfully read and converted.  Otherwise, 0 is returned if an error was
       encountered.

DIAGNOSTICS

       All error messages are directed to the TIFFErrorExtR() routine.

       "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\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.

       "No space for photometric conversion table":
          There was insufficient memory for a table used to convert image samples 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 (combination of BitsPerSample, SamplesPerPixel, and PhotometricInterpretation)
          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.

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

SEE ALSO

       TIFFOpen (3tiff), TIFFRGBAImage (3tiff), TIFFReadRGBAImage  (3tiff),  TIFFReadRGBATile  (3tiff),  libtiff
       (3tiff)

AUTHOR

       LibTIFF contributors

COPYRIGHT

       1988-2022, LibTIFF contributors

4.7                                               Apr 30, 2025                          TIFFREADRGBASTRIP(3tiff)