25cdf35a86
* jajuni.c: add Jarvis-Judice-Ninke dithering. It's a Floyd-Steinberg-like
error diffusion method that has fewer high resolution structural artifacts
at the expense of resolution.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2700 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
b5500986b2
* floydsteinberg.c: minor optimisation in the FStein error propagation.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2699 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
eb9a270380
* pipi_dither_ordered() now takes two arguments; any image can be used as
the ordered dithering matrix. To get the old behaviour, use:
pipi image.png pipi:bayer8 --dither ordered out.png
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2696 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
53268650a7
* dbs.c: generate the initial halftone using random dithering instead of
Floyd-Steinberg in order to avoid the energy level getting locally stuck
around error diffusion structure artifacts.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2672 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
0eda956bfc
* random.c: implement random dithering using a deterministic pseudo-RNG.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2671 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
18dd51e1a5
* Dithering algorithms no longer modify the original image.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2670 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
41efcdecc0
* Prefix dithering functions with _dither_ to avoid namespace cluttering.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2666 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
6a3309663e
* ordered.c: implement Bayer dithering (pretty trivial).
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2665 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
a6dcd80490
* dbs.c: optimise DBS by ignoring 16x16 cells that had no pixel changes for
the last two iterations.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2664 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
2a3c7ca990
* dbs.c: improve the DBS human visual system kernel by adding two Gaussian
kernels.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2663 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
87f8e922ab
* Error diffusion methods now support either raster or serpentine scan.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2656 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
302ce37f8e
* ostromoukhov.c: Ostromoukhov's simple error diffusion algorithm.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2654 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
2182fdfdbf
* floydsteinberg.c: perform Floyd-Steinberg dithering on a serpentine path.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2653 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
628c2618da
* dbs.c: new dithering function: Direct Binary Search. One of the best
dithering methods as of today, though extremely slow.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2651 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
1408cff41d
* Add Floyd-Steinberg grayscale dithering.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2637 92316355-f0b4-4df1-b90c-862c8a59935f
16 lat temu
sam