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set mct more carefully

This commit is contained in:
John Cupitt 2021-03-23 18:50:39 +00:00
parent 40c020ccd2
commit a16c0c0d78
1 changed files with 3 additions and 10 deletions
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13
libvips/foreign/jp2ksave.c
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@ -37,9 +37,6 @@
*/
/* TODO
*
* - we will have 0.5 pixels if the image width or height is odd and chroma
* subsampling is on ... this will cause at least read out of bounds.
*
* - could support tiff-like depth parameter
*
@ -624,14 +621,9 @@ vips_foreign_save_jp2k_build( VipsObject *object )
break;
}
if( jp2k->downsample ) {
if( jp2k->downsample )
jp2k->save_as_ycc = TRUE;
/* MCT does not work with subsample.
*/
jp2k->parameters.tcp_mct = FALSE;
}
/* CIELAB etc. do not seem to be well documented.
*/
switch( save->ready->Type ) {
@ -717,7 +709,8 @@ vips_foreign_save_jp2k_build( VipsObject *object )
/* Makes three band images smaller, somehow.
*/
jp2k->parameters.tcp_mct = save->ready->Bands == 3 ? 1 : 0;
jp2k->parameters.tcp_mct =
(save->ready->Bands == 3 && !jp2k->downsample) ? 1 : 0;
/* Lossy mode.
*/