pDCDM

Make your DCDM files smaller and faster

Reduce the file size of DCDM images by 50% compared to TIFF, while preserving:

• all image information;
• image processing throughput;
• current TIFF file practices, including naming conventions.

pDCDM is specified in SMPTE ST 428-24.

Try it today

Technical details

Each pDCDM file contains a single mathematically-lossless JPEG 2000 codestream that conforms to the profiles specified in SMPTE ST 2067-40 and optionally includes a COM marker with the string SMPTE DCDM X'Y'Z' image as defined in SMPTE ST 428-1.

Mathematically-lossless means that every 12-bit pixel value present in the TIFF file is preserved by pDCDM and the source TIFF image can be recreated exactly.

The pDCDM files created by this tool use:

• the RPCL progression order, which allows decoding of images in throughput-limited and -varying environments;
• the High-Throughput (HT) block coder defined in Rec. ITU-T T.814 | ISO/IEC 15444-15, which improves JPEG 2000 encoding and decoding speeds.

Other tools

Kakadu SDK

kdu_compress -i $SRC_FILE -o $KDU_J2C Creversible=yes \
Corder=RPCL Cblk="{32,128}" Cmodes=HT ORGtparts=R Clevels=5 \
ORGgen_tlm=6 -fprec 12M \
Cprecincts="{256,256},{256,256},{256,256},{256,256},{256,256},{128,128}" \
-com "SMPTE DCDM X'Y'Z' image as defined in SMPTE ST 428-1"

OpenJPH

ojph_compress -i $SRC_FILE -o $OJPH_J2C -reversible true -prog_order RPCL \
-block_size "{128,32}" -num_decomps 5 -colour_trans -tlm_marker true \
-precincts "{128,128},{256,256}" -tileparts R -bit_depth 12 \
-com "SMPTE DCDM X'Y'Z' image as defined in SMPTE ST 428-1"

Samples

• sample_kdu.0000001.pdc.j2c generated using Kakadu SDK.
• sample_ojph.0000001.pdc.j2c generated using OpenJPH.

Contact

Feedback and questions are welcome at pal@sandflow.com.

Acknowledgements

This demo uses the OpenJPH open-source library to encode and decode JPEG 2000 codestreams.