Enum crispy::shaders::yuv::ColorSpace

pub enum ColorSpace {
    BT470 = 2,
    BT709 = 1,
    Identity = 0,
}

FIXME: I don’t know enough about UVC, but the USB Device Class Definition for Video Devices - FAQ in version 1.5, 2.19 Multiple Color Matching Descriptors and table 2.6 states that there are 3 parameters to tweak: Color primary, transfer function, and luma matrix.

Not exactly sure how they work. This here is best effort. Someone with more experience can fix this.

So far, I’ve gathered:

• the luma transfer function gives the matrix calculating yuv = M·rgb
• the primaries matrix calculates rgb = P·xyz
• the transfer function calculates gamma

so the output should be srgb = gamma(M⁻¹·yuv).

TODO in libvidi: read the descriptor values.

Variants

BT470 = 2

ITU BT.470

BT709 = 1

ITU BT.709, for HDTV

Identity = 0

Doesn’t convert the color values

Trait Implementations

impl From<ColorSpace> for Matrix3<f32>

fn from(value: ColorSpace) -> Self

Converts to this type from the input type.