From 23abfd1827a896fb10a3d5a6442fe4af90509065 Mon Sep 17 00:00:00 2001 From: Duncan Tourolle Date: Sat, 26 Sep 2026 16:23:42 -0400 Subject: [PATCH] Ship four presets for a bluer sky MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Blue sky, Deep blue sky, Polariser, and Blue sky with golden land, in a Skies section after Essentials. Each darkens the colour mixer's azure and blue bands and adds chroma to them — what a polarising filter does to a clear sky — and brings the highlights down with it, so a white cloud does not read as a cut-out against the deeper blue. The stronger ones nudge azure towards blue and add dehaze. They are looks and work only on the hues a sky occupies, so an overcast frame is left nearly alone: there is no blue for them to deepen, and tinting grey cloud blue would be worse than doing nothing. Tuned by eye on the demo library's alpine and Manhattan frames, with an overcast Étretat frame as the control. --- core/dr-pipeline/presets/skies.drpl | 52 +++++++++++++++++++++++++++++ core/dr-pipeline/src/bundled.rs | 1 + docs/manual/README.md | 2 +- docs/manual/index.html | 2 +- 4 files changed, 55 insertions(+), 2 deletions(-) create mode 100644 core/dr-pipeline/presets/skies.drpl diff --git a/core/dr-pipeline/presets/skies.drpl b/core/dr-pipeline/presets/skies.drpl new file mode 100644 index 0000000..3661b95 --- /dev/null +++ b/core/dr-pipeline/presets/skies.drpl @@ -0,0 +1,52 @@ +drpl 1 + +# Skies: a bluer, deeper sky without touching the rest of the picture. +# +# Written against this pipeline, not derived from anybody's preset. Each +# works the colour mixer's azure and blue bands — the hues a clear sky +# occupies, 210° and 240° — darkening them and adding chroma, which is what +# a polarising filter does to a sky and why it reads as "more blue" rather +# than "more saturated". A grey sky has no hue for the bands to find, so on +# an overcast frame these do little, by construction: they cannot invent a +# sky, and a preset that tinted grey clouds blue would be one nobody trusted. +# +# Highlights come down with the sky in the stronger ones, because a darker +# blue beside a clipped white cloud looks like a mask edge. + +[preset Blue sky] +colour_mixer.azure_lum = -20 +colour_mixer.azure_sat = 25 +colour_mixer.blue_lum = -15 +colour_mixer.blue_sat = 20 +highlights_shadows.highlights = -15 + +[preset Deep blue sky] +colour_mixer.azure_hue = 10 +colour_mixer.azure_lum = -30 +colour_mixer.azure_sat = 35 +colour_mixer.blue_lum = -25 +colour_mixer.blue_sat = 30 +colour_mixer.cyan_sat = 10 +highlights_shadows.highlights = -30 + +[preset Polariser] +colour_mixer.azure_hue = 10 +colour_mixer.azure_lum = -35 +colour_mixer.azure_sat = 40 +colour_mixer.blue_lum = -30 +colour_mixer.blue_sat = 35 +colour_mixer.cyan_lum = -10 +colour_mixer.cyan_sat = 15 +dehaze.amount = 20 +highlights_shadows.highlights = -35 +vibrance.vibrance = 10 + +[preset Blue sky, golden land] +colour_mixer.azure_lum = -20 +colour_mixer.azure_sat = 25 +colour_mixer.blue_lum = -15 +colour_mixer.blue_sat = 20 +colour_mixer.orange_sat = 12 +colour_mixer.yellow_hue = -10 +colour_mixer.yellow_sat = 15 +highlights_shadows.highlights = -20 diff --git a/core/dr-pipeline/src/bundled.rs b/core/dr-pipeline/src/bundled.rs index cd78a85..538aa07 100644 --- a/core/dr-pipeline/src/bundled.rs +++ b/core/dr-pipeline/src/bundled.rs @@ -62,6 +62,7 @@ const SECTIONS: &[(&str, &str, &str)] = &[ "Essentials", include_str!("../presets/essentials.drpl"), ), + ("skies", "Skies", include_str!("../presets/skies.drpl")), ( "colour_film", "Colour film", diff --git a/docs/manual/README.md b/docs/manual/README.md index ca2e01a..5d01028 100644 --- a/docs/manual/README.md +++ b/docs/manual/README.md @@ -278,7 +278,7 @@ apply elsewhere, and imports Lightroom presets — `Folder…` for a folder of them, `.xmp file…` for one. The sheet lists your own presets first, then the ones DarkRoom ships — -Essentials, and colour, cinema and black-and-white film, one measured stock +Essentials, Skies, and colour, cinema and black-and-white film, one measured stock each. A shipped preset is a look: it changes what it names and leaves the photograph's own corrections alone, as an imported Lightroom preset does. Saving under a shipped preset's name makes your version the one that name diff --git a/docs/manual/index.html b/docs/manual/index.html index 31a6a2e..fbd47ff 100644 --- a/docs/manual/index.html +++ b/docs/manual/index.html @@ -334,7 +334,7 @@ keeps the current state under a name. Presets… saves the settings apply elsewhere, and imports Lightroom presets — Folder… for a folder of them, .xmp file… for one.

The sheet lists your own presets first, then the ones DarkRoom ships — -Essentials, and colour, cinema and black-and-white film, one measured stock +Essentials, Skies, and colour, cinema and black-and-white film, one measured stock each. A shipped preset is a look: it changes what it names and leaves the photograph's own corrections alone, as an imported Lightroom preset does. Saving under a shipped preset's name makes your version the one that name