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