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better jp2k save behaviour 

- don't enable mct if subsampling is on
- don't make such deep pyramids
This commit is contained in:
John Cupitt 2021-08-07 18:46:50 +01:00
parent fd1a036cd8
commit 57d8dd3ece
1 changed files with 3 additions and 3 deletions
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6
libvips/foreign/jp2ksave.c
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@ -828,16 +828,16 @@ vips_foreign_save_jp2k_build( VipsObject *object )
jp2k->parameters.cp_tdx = jp2k->tile_width; jp2k->parameters.cp_tdx = jp2k->tile_width;
jp2k->parameters.cp_tdy = jp2k->tile_height; jp2k->parameters.cp_tdy = jp2k->tile_height;
/* Makes three band images smaller, somehow. /* Makes many-band, non-subsampled images smaller, somehow.
*/ */
jp2k->parameters.tcp_mct = save->ready->Bands >= 3 ? 1 : 0; jp2k->parameters.tcp_mct = save->ready->Bands >= 3 && !jp2k->subsample;
/* Number of layers to write. Smallest layer is c. 2^5 on the smallest /* Number of layers to write. Smallest layer is c. 2^5 on the smallest
* axis. * axis.
*/ */
jp2k->parameters.numresolution = VIPS_MAX( 1, jp2k->parameters.numresolution = VIPS_MAX( 1,
log( VIPS_MIN( save->ready->Xsize, save->ready->Ysize ) ) / log( VIPS_MIN( save->ready->Xsize, save->ready->Ysize ) ) /
log( 2 ) - 4 ); log( 2 ) - 5 );
#ifdef DEBUG #ifdef DEBUG
printf( "vips_foreign_save_jp2k_build: numresolutions = %d\n", printf( "vips_foreign_save_jp2k_build: numresolutions = %d\n",
jp2k->parameters.numresolution ); jp2k->parameters.numresolution );