Get Maximum CinemaDNG Image Quality with Reduced Storage Space Using slimRAW 1.4, Intro Discount Available.

by Karin Gottschalk1 Comment

Great news for raw video shooters! Version 1.4 of the slimRAW lossless and lossy compression application for CinemaDNG raw video has been released, helping save hard drive storage space and making two-location file backups way more efficient.

The ability to shoot CinemaDNG raw video is a key feature in a range of cinema cameras and Canon DSLRs running Magic Lantern firmware.

The upside to shooting CinemaDNG? Beautiful, data-packed digital negatives just as tone, color and detail rich as stills photography raw files.

The downside? CinemaDNG eats up far more storage space than non-raw video, and the cost of pro-quality hard drives and SSDs is not dropping anywhere near as fast as we’d all like.

I passed on affordable raw-shooting cinema cameras and Magic Lantern’s raw functionality on my Canon DSLRs for that very reason but now slimRAW has given me cause to rethink.

The slimRAW folks tell us that their lossy but high quality CinemaDNG compression provides for big storage space and storage bandwidth gains. At compression ratios of 3:1 and 4:1, that is not a surprise.

Here are the NLEs and color grading products that currently support lossless CinemaDNG:

Unfortunately, Apple’s popular Final Cut Pro X is not on that list, but I hope lossy and lossless CinemaDNG support will be appearing in FCPX soon.

For a detailed list of raw-shooting cameras supported by slimRAW, best go to the slimRAW website. Off the bat, though, Blackmagic Design’s cameras are included as well as raw footage from Magic Lantern-equipped Canon DSLRs (converted to CinemaDNG), the Digital Bolex D16, Sony’s FS700 and FS7, and several independently-developed cinema raw-shooting cameras.

Another key slimRAW key feature is its ability to simultaneously offload CinemaDNG raw video from recorders or cameras with lossless or lossy compression, verification and checksum generation on the fly.

slimRAW is currently available in Windows and Mac versions at an introductory discount price of USD $39.00 with a function-limited trial version for tryout. Future minor version updates will be free.

slimRAW adds 3:1 and 4:1 CinemaDNG compression

Via slimRaw:

January 11, 2016 – The latest update of slimRAW was released today. Version 1.4 adds 3:1 and 4:1 lossy CinemaDNG compression options for even greater storage space savings. It enables the beauty of the raw workflow at smaller data footprints. The lossily compressed CinemaDNG raw video is compatible with Blackmagic Design DaVinci Resolve.

slimRAW is a fast CinemaDNG compressor which saves storage space and reduces storage bandwidth requirements for CinemaDNG raw video production. slimRAW converts uncompressed CinemaDNG raw video to losslessly or lossily compressed CinemaDNG. slimRAW can also recompress and optimize size of CinemaDNG video that is already losslessly compressed. slimRAW doubles as a CinemaDNG raw video DIT utility: it can offload raw video from camera or recorder media to two storage locations simultaneously with on-the-fly lossless or lossy compression, checksum generation and verification, while preserving all the original metadata. slimRAW is available for Microsoft Windows and Apple OS X.

For a list of supported cameras, compatible video production software and more information about slimRAW visit:


slimRAW highlights

Choice of lossless or high quality lossy compression
slimRAW can compress to standard lossless CInemaDNG for a substantial data size reduction with no image quality loss, or do lossy CinemaDNG compression for even smaller data sizes. slimRAW can also recompress and optimize CinemaDNG raw video that is already losslessly compressed.

Offload with compression in a single step
slimRAW can offload CinemaDNG raw footage from camera or recorder media to main storage while losslessly or lossily compressing it in the same step. slimRAW compression is fast enough to make this practical even on location.

Dual output
slimRAW can optionally output compressed CinemaDNG files to two locations simultaneously. This is particularly useful for offloading CinemaDNG video to main storage and backup storage simultaneously.

Data integrity tracking
slimRAW can optionally generate checksums to facilitate data integrity tracking through post production and archiving. slimRAW can be used to verify these checksums at any later stage.

Metadata preservation
slimRAW preserves all the original embedded metadata, including color, time codes and frame rate related metadata.

Streamlined UI
slimRAW's user interface is simple, clean and easy to use. It gets the job done without getting in the way.

The multicore enabled parallel design of slimRAW makes use of all the available CPU power on your computer to maximize processing speed.

Output compatibility
Video production software supporting losslessly compressed CinemaDNG includes Blackmagic Design DaVinci Resolve, Blackmagic Design Fusion, Assimilate Scratch, The Foundry NUKE, Lightworks, Adobe Premiere CC, Adobe SpeedGrade CC, Adobe After Effects, Adobe Photoshop and Adobe Lightroom.

Lossy CinemaDNG is supported by Blackmagic Design DaVinci Resolve.

Supported cameras and recorders

  • Uncompressed CinemaDNG video from:
  • Digital Bolex D16,
  • Blackmagic Design Cinema Camera (pre-firmware 2.1),
  • Canon DSLR Magic Lantern raw (converted to CinemaDNG/DNG),
  • Sony FS700/FS7 raw recorded through Convergent Design Odyssey 7Q/7Q+,
  • Ikonoskop A-Cam dII,
  • Kinefinity KineMINI 4K, KineMAX 6K, KineRAW,
  • Indiecam indieGS2K and indiePOV (uncompressed 12-bit CinemaDNG video as exported by Indiecam Instant-RAW software),
  • uncompressed DNG frame stacks from Fastec Imaging TS and HiSpec series cameras (10-bit in a 16-bit container and 8-bit),
  • most other standard compliant uncompressed 8-, 12-, 14- or 16-bit CinemaDNG footage.

Losslessly compressed CinemaDNG video from:


(cover photo credit: snap from


Leave a Comment