A. Molzer
1732481b01
The CIE Lab interpretation uses heterogeneous samples, and the ITU Lab encoding requires the Tag Decode (433, 0x01B1) which has default values depending on bit depth and convering values into floating points, probably. See also Photometric Interpretation: <https://web.archive.org/web/20050309053132/http://www.awaresystems.be/imaging/tiff/tifftags/photometricinterpretation.html> See also Tag Decode: <https://web.archive.org/web/20050309072856/http://www.awaresystems.be/imaging/tiff/tifftags/decode.html>
84 lines
2.1 KiB
Rust
84 lines
2.1 KiB
Rust
//! Decoding and Encoding of TIFF Images
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//!
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//! TIFF (Tagged Image File Format) is a versatile image format that supports
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//! lossless and lossy compression.
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//!
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//! # Related Links
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//! * <https://web.archive.org/web/20210108073850/https://www.adobe.io/open/standards/TIFF.html> - The TIFF specification
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mod bytecast;
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pub mod decoder;
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mod directory;
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pub mod encoder;
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mod error;
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pub mod tags;
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pub use self::directory::Directory;
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pub use self::error::{TiffError, TiffFormatError, TiffResult, TiffUnsupportedError, UsageError};
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/// An enumeration over supported color types and their bit depths
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#[derive(Copy, PartialEq, Eq, Debug, Clone, Hash)]
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#[non_exhaustive]
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pub enum ColorType {
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/// Pixel is grayscale
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Gray(u8),
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/// Pixel contains R, G and B channels
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RGB(u8),
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/// Pixel is an index into a color palette
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Palette(u8),
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/// Pixel is grayscale with an alpha channel
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GrayA(u8),
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/// Pixel is RGB with an alpha channel
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RGBA(u8),
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/// Pixel is CMYK
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CMYK(u8),
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/// Pixel is CMYK with an alpha channel
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CMYKA(u8),
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/// Pixel is YCbCr
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YCbCr(u8),
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/// Pixel is CIE L*a*b* (ICC LAb)
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Lab(u8),
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/// Pixel has multiple bands/channels
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Multiband { bit_depth: u8, num_samples: u16 },
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}
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impl ColorType {
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fn bit_depth(&self) -> u8 {
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match *self {
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ColorType::Gray(b)
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| ColorType::RGB(b)
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| ColorType::Palette(b)
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| ColorType::GrayA(b)
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| ColorType::RGBA(b)
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| ColorType::CMYK(b)
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| ColorType::CMYKA(b)
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| ColorType::YCbCr(b)
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| ColorType::Lab(b)
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| ColorType::Multiband { bit_depth: b, .. } => b,
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}
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}
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fn num_samples(&self) -> u16 {
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match *self {
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ColorType::Gray(_) => 1,
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ColorType::RGB(_) => 3,
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ColorType::Palette(_) => 1,
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ColorType::GrayA(_) => 2,
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ColorType::RGBA(_) => 4,
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ColorType::CMYK(_) => 4,
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ColorType::CMYKA(_) => 5,
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ColorType::YCbCr(_) => 3,
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ColorType::Lab(_) => 3,
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ColorType::Multiband { num_samples, .. } => num_samples,
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}
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}
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}
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