Decode
Whole images, crops and scaled output
Decode baseline, extended, progressive and lossless JPEG. Reduced IDCT paths provide one-half, one-quarter and one-eighth output for sequential and progressive DCT images.
JPEG / Rust / CPU + GPU adapters
Rust JPEG Codec
j2k-jpeg is a pure-Rust JPEG inspection, decoding and encoding crate for general imaging, pathology, medical imaging and transcode pipelines.
01 / Workflows
JPEG primitives for real pipelines.
Use one crate for ordinary JPEG input, DICOM-oriented 12-bit and lossless variants, TIFF tile normalization and baseline encoding.
Encode
Baseline, 12-bit and lossless
Encode 8-bit baseline JPEG, 12-bit extended sequential JPEG and lossless JPEG with predictors, point transforms and restart intervals. The crate writes codestreams; containers remain the caller’s responsibility.
Integrate
TIFF, DICOM and ICC metadata
Normalize abbreviated TIFF JPEG tiles with shared tables, repair zero-SOF dimensions from container metadata, and extract, insert or replace ordered APP2 ICC profile data.
02 / Coverage
Broad JPEG support. Clear rejection.
DCT JPEG 8- or 12-bit
Baseline, extended and progressive DCT coverage includes grayscale, YCbCr, RGB and Adobe CMYK/YCCK for supported sampling layouts.
Lossless JPEG 2–16 bit
Predictors 1–7, point transforms, restart intervals and split scans are supported within the published format boundary.
Explicit limits return errors
Arithmetic coding, hierarchical JPEG, four-component lossless JPEG and incompatible sampling layouts are rejected rather than guessed or silently converted.
Reference behaviorThe committed matrices compare supported decoded output with libjpeg-turbo and DICOM JPEG cases with DCMTK. See the crate README and source for the exact boundary.
03 / Install
Add JPEG to a Rust pipeline.
Use j2k-jpeg directly for JPEG. Use j2k for JPEG 2000 and HTJ2K, or j2k-transcode for supported JPEG-to-HTJ2K coefficient-domain workflows.
$ cargo add j2k-jpegSafe Rust inspection, decode and encode APIs.
$ cargo add j2k-transcode