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set reduced-resolution flag when writing TIFF pyramid layers

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TIFF pyramid layers other than the full-resolution image should be tagged
with a TIFFTAG_SUBFILETYPE of FILETYPE_REDUCEDIMAGE.
This commit is contained in:
Benjamin Gilbert 2011-11-23 00:01:05 -05:00
parent 5f288314bb
commit 19af00bf28
1 changed files with 8 additions and 0 deletions
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8
libvips/format/im_vips2tiff.c
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@ -121,6 +121,8 @@
* output directory
* 5/9/11
* - enable YCbCr compression for jpeg write
* 23/11/11
* - set reduced-resolution subfile type on pyramid layers
*/
/*
@ -567,6 +569,11 @@ write_tiff_header( TiffWrite *tw, TIFF *tif, int width, int height )
}
else
TIFFSetField( tif, TIFFTAG_ROWSPERSTRIP, 16 );
if( tif != tw->tif ) {
/* Pyramid layer.
*/
TIFFSetField( tif, TIFFTAG_SUBFILETYPE, FILETYPE_REDUCEDIMAGE );
}
/* Sample format ... for float, we write IEEE.
*/
@ -1465,6 +1472,7 @@ tiff_copy( TiffWrite *tw, TIFF *out, TIFF *in )
CopyField( TIFFTAG_TILEWIDTH, i32 );
CopyField( TIFFTAG_TILELENGTH, i32 );
CopyField( TIFFTAG_ROWSPERSTRIP, i32 );
CopyField( TIFFTAG_SUBFILETYPE, i32 );
if( tw->predictor != -1 )
TIFFSetField( out, TIFFTAG_PREDICTOR, tw->predictor );