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color-management: implement bt1886 as pure gamma24

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This commit is contained in:
Julian Orth 2025-09-05 12:31:01 +02:00
parent 2dcc3806ad
commit 050515d2ed
3 changed files with 13 additions and 37 deletions
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24
src/theme.rs
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@ -96,13 +96,6 @@ impl Color {
1.055 * c.powf(1.0 / 2.4) - 0.055
}
}
fn bt1886(c: f32) -> f32 {
if c < 0.081 {
c / 4.5
} else {
((c + 0.099) / 1.099).powf(1.0 / 0.45)
}
}
fn st240(c: f32) -> f32 {
if c < 0.0913 {
c / 4.0
@ -122,6 +115,9 @@ impl Color {
fn gamma22(c: f32) -> f32 {
c.powf(2.2)
}
fn gamma24(c: f32) -> f32 {
c.powf(2.4)
}
fn gamma28(c: f32) -> f32 {
c.powf(2.8)
}
@ -136,7 +132,7 @@ impl Color {
TransferFunction::Srgb => convert!(srgb),
TransferFunction::Linear => convert!(linear),
TransferFunction::St2084Pq => convert!(st2084_pq),
TransferFunction::Bt1886 => convert!(bt1886),
TransferFunction::Bt1886 => convert!(gamma24),
TransferFunction::Gamma22 => convert!(gamma22),
TransferFunction::Gamma28 => convert!(gamma28),
TransferFunction::St240 => convert!(st240),
@ -255,13 +251,6 @@ impl Color {
((c + 0.055) / 1.055).powf(2.4)
}
}
fn bt1886(c: f32) -> f32 {
if c < 0.018 {
4.5 * c
} else {
1.099 * c.powf(0.45) - 0.099
}
}
fn st240(c: f32) -> f32 {
if c < 0.0228 {
4.0 * c
@ -287,6 +276,9 @@ impl Color {
fn gamma22(c: f32) -> f32 {
c.powf(1.0 / 2.2)
}
fn gamma24(c: f32) -> f32 {
c.powf(1.0 / 2.4)
}
fn gamma28(c: f32) -> f32 {
c.powf(1.0 / 2.8)
}
@ -307,7 +299,7 @@ impl Color {
TransferFunction::Srgb => convert!(srgb),
TransferFunction::Linear => convert!(linear),
TransferFunction::St2084Pq => convert!(st2084_pq),
TransferFunction::Bt1886 => convert!(bt1886),
TransferFunction::Bt1886 => convert!(gamma24),
TransferFunction::Gamma22 => convert!(gamma22),
TransferFunction::Gamma28 => convert!(gamma28),
TransferFunction::St240 => convert!(st240),