From: "Tomas Härdin" <git@haerdin.se>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH v2 01/32] avfilter/palettegen: allow a minimum of 2 colors
Date: Tue, 03 Jan 2023 19:59:45 +0100
Message-ID: <53a9d7d8254c53cb490f305710d10bf1e4c7e860.camel@haerdin.se> (raw)
In-Reply-To: <Y6yzwiKYUAwa7vTi@ssq0.pkh.me>
ons 2022-12-28 klockan 22:23 +0100 skrev Clément Bœsch:
> On Wed, Dec 28, 2022 at 10:04:26PM +0100, Tomas Härdin wrote:
> [...]
> > Does this mean all-black with transparent is disallowed?
>
> Yes a single color with or without an extra transparency slot makes
> no
> sense.
>
> > Shouldn't it be max_colors + reserve < 2?
>
> max_colors accounts for the transparent color as well. So if you
> specify
> 256 colors with reserve_transparent (default settings), you'll get
> 255
> color slots and 1 for transparency.
>
> It also means that if want to go as low as 2 colors in your palette
> you
> can do max_colors=3 with reserve_transparent=1, or max_colors=2 with
> reserve_transparent=0
>
> 3-1 → 2
> 2-0 → 2
>
> These are the minimums.
Right, because there's no "0bpp" pixel format with 1bpp alpha.. yet!
Something similar actually exists with GoldSrc .spr files, especially
the indexalpha mode. It is effectively "0bpp" with 8-bit alpha:
https://the303.org/tutorials/gold_sprite_p3.htm
>
> PS: sorry for the double answer Tomas!
No problem :)
/Tomas
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next prev parent reply other threads:[~2023-01-03 18:59 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-05 15:26 [FFmpeg-devel] Rework color quantization in palette{gen,use} Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 01/15] Revert "avfilter/vf_palette(gen|use): support palettes with alpha" Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 02/15] avfilter: add palette utils Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 03/15] avfilter/palette{use, gen}: simplify a few alpha masks Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 04/15] avfilter/paletteuse: switch from u8[4] to u32 for color code Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 05/15] avfilter/paletteuse: name target color arg consistently in colormap functions Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 06/15] avfilter/paletteuse: remove unused alpha split dimension Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 07/15] avfilter/paletteuse: remove redundant alpha condition Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 08/15] avfilter/paletteuse: switch to a perceptual model Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 09/15] avfilter/palettegen: average color in linear space Clément Bœsch
2022-11-05 15:39 ` Paul B Mahol
2022-11-05 18:50 ` Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 10/15] avfilter/palettegen: move box variance computation in a dedicated function Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 11/15] avfilter/palettegen: comment on the unnormalized variance Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 12/15] avfilter/palettegen: base split decision on a perceptual model Clément Bœsch
2022-11-05 19:07 ` Andreas Rheinhardt
2022-11-08 21:09 ` Clément Bœsch
2022-12-27 23:20 ` Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 13/15] avfilter/palettegen: use variance per-axis instead of the range Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 14/15] avfilter/palettegen: rename longest to split_axis Clément Bœsch
2022-11-05 15:26 ` [FFmpeg-devel] [PATCH 15/15] avfilter/palette{use, gen}: update Copyright after recent changes Clément Bœsch
2022-11-05 15:44 ` [FFmpeg-devel] Rework color quantization in palette{gen,use} Paul B Mahol
2022-11-05 18:54 ` Clément Bœsch
2022-11-06 13:19 ` Ronald S. Bultje
2022-11-08 21:22 ` Clément Bœsch
2022-11-05 21:52 ` Soft Works
2022-11-06 17:09 ` Michael Niedermayer
2022-11-06 17:30 ` Michael Niedermayer
2022-11-08 21:14 ` Clément Bœsch
2022-12-31 12:11 ` Clément Bœsch
2023-01-02 21:57 ` Michael Niedermayer
2023-01-02 23:05 ` Clément Bœsch
2023-01-03 18:50 ` Michael Niedermayer
2022-11-06 19:46 ` Soft Works
2022-11-08 21:07 ` Clément Bœsch
2022-11-08 22:37 ` Soft Works
2022-12-27 23:31 ` Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] New iteration for the color quantization in palette{gen, use} Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 01/32] avfilter/palettegen: allow a minimum of 2 colors Clément Bœsch
2022-12-28 21:04 ` Tomas Härdin
2022-12-28 21:23 ` Clément Bœsch
2023-01-03 18:59 ` Tomas Härdin [this message]
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 02/32] avfilter/palette{gen, use}: revert support palettes with alpha Clément Bœsch
2023-01-03 19:11 ` Paul B Mahol
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 03/32] avfilter/palette{gen, use}: simplify a few alpha masks Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 04/32] avfilter/palette{gen, use}: add palette utils Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 05/32] avfilter/paletteuse: switch from u8[4] to u32 for color code Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 06/32] avfilter/paletteuse: name target color arg consistently in colormap functions Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 07/32] avfilter/paletteuse: remove unused alpha split dimension Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 08/32] avfilter/paletteuse: remove redundant alpha condition Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 09/32] avfilter/paletteuse: switch to a perceptual model Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 10/32] avfilter/palettegen: move box stats computation to a dedicated function Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 11/32] avfilter/palettegen: define the best axis to cut using the squared error Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 12/32] avfilter/palettegen: use box->major_axis without intermediate variable Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 13/32] avfilter/palettegen: always compute the box variance Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 14/32] avfilter/palettegen: rename variance to cut_score Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 15/32] avfilter/palettegen: change cut score from ∑e² to max e² Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 16/32] avfilter/palettegen: compute average color within compute_box_stats() Clément Bœsch
2022-12-27 23:17 ` [FFmpeg-devel] [PATCH v2 17/32] avfilter/palettegen: misc cosmetics Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 18/32] avfilter/palettegen: rename local variable box_weight to weight Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 19/32] avfilter/palettegen: switch to signed arithmetic Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 20/32] avfilter/palettegen: base box split decision on a perceptual model Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 21/32] avfilter/palettegen: add a warning about supporting only sRGB Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 22/32] avfilter/palettegen: make refs order deterministic Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 23/32] avfilter/palettegen: use libc qsort Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 24/32] avfilter/palette{gen, use}: update Copyright after recent changes Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 25/32] avfilter/palette: add lowbias32 hashing Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 26/32] avfilter/palettegen: use lowbias32 for color hashing Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 27/32] avfilter/paletteuse: " Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 28/32] avfilter/paletteuse: switch to recursive method Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 29/32] avfilter/paletteuse: remove alternative search methods Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 30/32] avfilter/paletteuse: remove mean error tool Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 31/32] avfilter/paletteuse: move r, g, b computation in a more local scope Clément Bœsch
2022-12-27 23:18 ` [FFmpeg-devel] [PATCH v2 32/32] avfilter/palette{gen, use}: misc for-loop cosmetics Clément Bœsch
2023-01-03 16:28 ` [FFmpeg-devel] New iteration for the color quantization in palette{gen, use} Clément Bœsch
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