Constant turbojpeg_sys::TJCS_TJCS_GRAY

pub const TJCS_TJCS_GRAY: TJCS = 2;

Grayscale colorspace. The JPEG image retains only the luminance data (Y component), and any color data from the source image is discarded. Grayscale JPEG images can be compressed from and decompressed to packed-pixel images with any of the extended RGB or grayscale pixel formats, or they can be compressed from and decompressed to planar YUV images.