Give the Vivid presets and Punch measured amounts of colour

On the default rendering, Vivid added 22 % more chroma than the rendering
itself, and Punch 5 % — less than the photographer's earlier exports show
with no look applied (14 % over ours) and well below their everyday look
(27 %). Each preset's colour values (vibrance, saturation, the mixer's
saturation bands) are now scaled together, tone values untouched and
negative ones — Vivid portrait's skin protection — left as written, until
the preset measures: Vivid and Vivid warm 1.30, Vivid landscape 1.38, Vivid,
strong 1.45, Vivid portrait 1.15, Punch 1.12. Measured as mean CIELAB chroma
over 30 raws from the library, as a ratio to the default rendering.

core/dr-pipeline/presets/essentials.drpl

@@ -25,7 +25,7 @@ vibrance.vibrance = 10
 blacks_whites.blacks = -8
 clarity.amount = 12
 contrast.contrast = 18
-vibrance.vibrance = 18
+vibrance.vibrance = 32
 
 [preset Recover the sky]
 blacks_whites.whites = -10

core/dr-pipeline/presets/vivid.drpl

@@ -9,18 +9,27 @@ drpl 1
 #
 # Each changes only what it names (FR-DEV-6), so a corrected exposure or
 # white balance survives applying one.
+#
+# How much colour each adds is measured, not guessed: mean CIELAB chroma on
+# raws rendered with the default (DNG reference) rendering, as a ratio to that
+# rendering. For scale, the photographer's earlier exports of the same kind of
+# raws sit at 1.14 with no look applied and 1.27 with their everyday look.
+# Vivid 1.30 and Vivid warm 1.30 sit just above that; Vivid landscape 1.38;
+# Vivid, strong 1.45; Vivid portrait 1.15, with its skin bands held down as
+# written. Tuned by scaling each preset's colour values together, never its
+# tone ones.
 
 [preset Vivid]
 contrast.contrast = 10
-saturation.saturation = 8
-vibrance.vibrance = 30
+saturation.saturation = 10
+vibrance.vibrance = 39
 
 [preset Vivid, strong]
 blacks_whites.blacks = -10
 clarity.amount = 8
 contrast.contrast = 18
-saturation.saturation = 15
-vibrance.vibrance = 45
+saturation.saturation = 18
+vibrance.vibrance = 54
 
 # Foliage and sky: green and chartreuse for leaves and grass, azure and blue
 # for sky and water, a little yellow for dry grass and stone. The skin bands
@@ -29,37 +38,37 @@ vibrance.vibrance = 45
 [preset Vivid landscape]
 clarity.amount = 10
 colour_mixer.azure_lum = -10
-colour_mixer.azure_sat = 20
+colour_mixer.azure_sat = 27
 colour_mixer.blue_lum = -10
-colour_mixer.blue_sat = 15
-colour_mixer.chartreuse_sat = 15
-colour_mixer.green_sat = 20
-colour_mixer.yellow_sat = 10
+colour_mixer.blue_sat = 21
+colour_mixer.chartreuse_sat = 21
+colour_mixer.green_sat = 27
+colour_mixer.yellow_sat = 14
 contrast.contrast = 12
-saturation.saturation = 5
-vibrance.vibrance = 25
+saturation.saturation = 7
+vibrance.vibrance = 34
 
 # Golden hour: oranges and yellows up and a warm cast laid over the
 # highlights only, so shadows stay clean rather than muddy.
 [preset Vivid warm]
 colour_grading.highlight_hue = 45
 colour_grading.highlight_strength = 12
-colour_mixer.orange_sat = 15
-colour_mixer.red_sat = 8
-colour_mixer.yellow_sat = 15
+colour_mixer.orange_sat = 20
+colour_mixer.red_sat = 11
+colour_mixer.yellow_sat = 20
 contrast.contrast = 8
-vibrance.vibrance = 25
+vibrance.vibrance = 34
 
 # People: everything around the subject gets richer while skin does not.
 # Vibrance already protects skin; the orange and red bands are then held a
 # little below where they started, because a face is the one colour every
 # viewer knows the right value of.
 [preset Vivid portrait]
-colour_mixer.azure_sat = 10
-colour_mixer.blue_sat = 12
-colour_mixer.green_sat = 12
+colour_mixer.azure_sat = 15
+colour_mixer.blue_sat = 18
+colour_mixer.green_sat = 18
 colour_mixer.orange_sat = -10
 colour_mixer.red_sat = -5
 contrast.contrast = 6
 saturation.saturation = -5
-vibrance.vibrance = 25
+vibrance.vibrance = 37