* seems to export to cmyk+2 correctly
We'll need something fancier for import.
* more hacking
* Revert "more hacking"
This reverts commit fcdad5b491fc4d5a1750388947e42d1e98b1d9d7.
* generalise to many colour export
Should work up to 12 colour profiles (all that lcms supports).
* support import with N-colour profiles
* webpsave: switch to sink_disc
* fix some warnings
* distinguish between animated and single image write
* fix some formatting issues
* add missing comments
* fix webpsave_mime
* don't use sink_disc for single image webp write
* fix potential segv/double free
* update changelog
* remove leftover function declaration
* Revert "don't use sink_disc for single image webp write"
This reverts commit a75922ca93ee8987fa5e1ffc52b68e22bd6fb1fb.
* implement review feedback
* adjust to a column size of 80
* get contiguous RGB(A) buffer directly from VipsRegion
* Revert "get contiguous RGB(A) buffer directly from VipsRegion"
This reverts commit 84fc10e52fb223f0208c605dde92d3f821ceee0e.
* accumulate image data directly in frame_bytes buffer
* switch WebP back to Webp naming scheme
* rename page_index to page_number
* revise formatting
* move tiff decompress outside lock
Most time in TIFF read is spent in decompression. If we move this
outside the lock, we can get a useful speedup.
This commit adds the machinery to move the lock to before decompress, so
jp2k decompression is now threaded.
Before:
```
$ vips copy wtc.jpg x.tif[tile,compression=jp2k]
$ time vips avg x.tif
117.249845
real 0m15.085s
user 0m16.155s
sys 0m0.109s
```
After:
```
$ time vips avg x.tif
117.249845
real 0m1.207s
user 0m18.384s
sys 0m0.369s
```
* start moving jpg decode outside the lock
* move jpeg decompress outside the lock
seems to work
* add some more tile size checks
double-check jpeg tile size before decode
* fix tiffload demand hinting
We were not setting the hint correctly in header load, and we were not
hinting smalltile for tiled TIFFs.
SOme combinations of high bitdepth images with low bitdepth PNG save could
produce incorrect images, for example saving a 16-bit fourier image as 1-bit.
We were avoiding /0 by testing for alpha==0, however, this will still
allow very small values of alpha to generate +/- Inf. Instead, check for
abs(alpha)<epsilon.
Fixes some artifacts after unpremul.
We were minimising at the end of threadpool_run, but this was being
called for each sinkscreen render pass, so we were throwing away the
display cache.
Instead, minimise after sink, sink_memory and sink_disc.
To disable DoS limits for JPEG loading. Adding API on a stable branch is
bad, but this fixes a regression, so I think it's necessary,
unfortunately.
See https://github.com/libvips/libvips/issues/2973
* flag to save bmp with bitdepth 1
* magicksave: add bitdepth option
* update comments
* update documentation
* revised based on review comments
Co-authored-by: Thomas Barton <thomasryanbarton@gmail.com>
* save GIF palette as metadata
... if there are no local colour tables.
See https://github.com/libvips/libvips/issues/2576
* cgifsave: reuse global palette, if possible
* add reuse_palette parameter
* add reoptimise parameter and reuse palette by default
* attach global palette even if local palettes are present
* add check for presence of use-lct
* Revert "add check for presence of use-lct"
This reverts commit cd0f14e45e8bed8f108ee9666e2569c6355f17eb.
* Revert "attach global palette even if local palettes are present"
This reverts commit 4085b9e14b73c8990e9653ccc6f90477c2a43032.
* move global palette quantization to cgif_build
* rename member variable gct
* update comments
* improve error handling
* update documentation
Co-authored-by: John Cupitt <jcupitt@gmail.com>
