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add note about plane separate write

This commit is contained in:
John Cupitt 2020-06-05 12:14:40 +01:00
parent c82be3d30e
commit d5eecac88c
1 changed files with 11 additions and 2 deletions
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13
libvips/foreign/vips2tiff.c
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@ -251,8 +251,17 @@
/* TODO:
*
* - revise tests
* - vipsthumbnail support for subifd pyramids
* - add a flag for plane-separate write
*
* At the moment, we write bioformats-style TIFFs by splitting bands up,
* making a toilet-roll image and writing out in pages. The TIFFs we make
* are not tagged as plane-separate and do not have (eg.) RGB photometric
* interpretation. Moreover, when working from an RGB source, we'll end
* up reading the input three times.
*
* A write-plane-separate flag to the TIFF writer could let us set the
* photometric interpretation correctly, and save all planes in a single
* pass before doing a final gather sweep.
*/
/* Max number of alpha channels we allow.