Convert MOS to EXR

Drag and drop files here or click to select.
Max file size 100mb.

Uploading progress:

MOS vs EXR Format Comparison

Aspect	MOS (Source Format)	EXR (Target Format)
Format Overview	MOS Leaf MOS RAW Leaf's proprietary RAW format from their medium format digital backs, used primarily by the Leaf Aptus and Valeo series. MOS stores unprocessed sensor data from Leaf's high-resolution CCD sensors, delivering exceptional image quality for professional photography. Leaf digital backs were known for their color accuracy and are now part of the Phase One ecosystem. Lossless RAW	EXR OpenEXR (Industrial Light & Magic) OpenEXR, developed by Industrial Light & Magic (ILM) in 2003, is the industry-standard high dynamic range image format for visual effects, film production, and 3D rendering. EXR stores image data in 16-bit or 32-bit floating-point precision per channel, supporting multi-channel and multi-layer compositing with an extremely wide dynamic range. It is the backbone of professional VFX pipelines worldwide. Lossless Modern
Technical Specifications	Color Depth: 16-bit per channel (RAW sensor data) Compression: Uncompressed RAW Transparency: Not supported Animation: Not supported Extensions: .mos	Color Depth: 16-bit half-float or 32-bit float per channel Compression: PIZ, ZIP, ZIPS, RLE, PXR24, B44, DWAA/DWAB Transparency: Full alpha channel (float precision) Animation: Multi-part files with deep data Extensions: .exr
Image Features	Transparency: Not supported Animation: Not supported RAW Data: Unprocessed medium format CCD sensor data Dynamic Range: 12+ stops of dynamic range HDR: Native high dynamic range from CCD sensor Metadata: EXIF, Leaf-specific camera and back data	Transparency: Full floating-point alpha channel Animation: Multi-part files for sequences and deep compositing Color Depth: 16-bit half-float or 32-bit full-float per channel Multi-Layer: Arbitrary number of named channels and layers HDR: Native — designed for HDR with extreme dynamic range Metadata: Extensible attribute system (any key-value data)
Processing & Tools	MOS processing and decoding tools: # Convert MOS to TIFF for viewing rawpy mos_file.mos --output tiff # Process with dcraw dcraw -v -w -o 1 input.mos	EXR creation and inspection tools: # Convert to EXR with ImageMagick magick input.png -define exr:color-type=RGB \ output.exr # View EXR metadata exrheader input.exr # Convert EXR to PNG for viewing magick input.exr -auto-level output.png
Advantages	Exceptional color accuracy from Leaf CCD sensors Medium format resolution for large prints Full unprocessed sensor data for maximum flexibility Renowned color science for skin tones and product work Supported by major RAW processing software	Industry standard for VFX, film, and 3D rendering 16/32-bit float provides extreme dynamic range and precision Multi-channel support for complex compositing (RGBA, depth, normals, motion vectors) Multiple compression options balancing speed and ratio Deep image support for volumetric and particle rendering Open-source format maintained by Academy Software Foundation Tiled and scanline storage modes for flexible access patterns
Disadvantages	Very large uncompressed file sizes Legacy format from discontinued product line Limited to Leaf digital back ecosystem Requires specialized RAW processing software No new cameras produce MOS files	Large file sizes even with compression Not supported in web browsers Requires specialized software for viewing Overkill for simple image storage tasks Complex format specification for multi-part files
Common Uses	Professional studio photography archives Commercial product photography Fashion and beauty photography Fine art reproduction and printing Archival Leaf digital back images	Visual effects compositing (Nuke, Fusion, After Effects) 3D rendering output (Arnold, V-Ray, RenderMan, Blender) Film and television post-production HDR environment maps and light probes Game asset pipeline (texture baking, lightmaps) Scientific and astronomical imaging
Best For	Processing archival Leaf medium format photographs Maximum color accuracy for commercial reproduction Large-format print production from Leaf files Professional reprocessing of legacy Leaf archives	Professional VFX and film compositing pipelines 3D rendering with multi-channel output HDR imaging requiring extreme dynamic range Multi-layer compositing with named channels Archival storage of maximum-quality renders
Version History	Introduced: 2003 (Leaf Valeo digital backs) Current Version: MOS (last used before Phase One acquisition) Status: Legacy, superseded by Phase One IIQ Evolution: Leaf Valeo → Leaf Aptus → MOS format → Phase One IIQ	Introduced: 2003 (ILM, open-sourced) Current Version: OpenEXR 3.x (Academy Software Foundation) Status: Active, industry standard for VFX/film Evolution: ILM internal (1999) → OpenEXR 1.0 (2003) → 2.0 (deep data, 2013) → 3.0 (2021)
Software Support	Image Editors: Capture One, Adobe Lightroom, Camera Raw Web Browsers: Not supported OS Preview: Adobe Bridge, Leaf Capture (discontinued) Mobile: Limited (Lightroom Mobile) CLI Tools: rawpy, dcraw, LibRaw, exiftool	Image Editors: Nuke, Fusion, After Effects, Photoshop, GIMP Web Browsers: Not supported OS Preview: Requires specialized VFX/3D viewers Mobile: Not supported CLI Tools: OpenEXR tools, ImageMagick, OpenCV, Pillow

Why Convert MOS to EXR?

Converting MOS to EXR bridges Leaf medium format digital back RAW data with modern VFX and film production pipelines. Leaf digital backs were renowned for exceptional color accuracy, particularly for skin tones and product photography — EXR's floating-point precision preserves this quality for professional compositing and visual effects integration.

Commercial photography archives shot on Leaf digital backs often need reprocessing for modern productions, digital billboards, or web campaigns. Converting MOS to EXR brings Leaf's exceptional color science into professional compositing tools like Nuke, Fusion, and After Effects, enabling contemporary color grading and effects work with floating-point precision.

For studios and archives maintaining legacy Leaf MOS files, conversion to EXR provides a future-proof format backed by the Academy Software Foundation's open-source specification. As Leaf's software and camera support diminishes, EXR ensures these high-quality medium format images remain accessible in modern post-production tools.

The conversion processes MOS's uncompressed RAW sensor data into EXR's floating-point channels, preserving Leaf's renowned color fidelity and dynamic range. While file sizes may change, the resulting EXR files provide industry-standard compatibility with all major VFX and 3D rendering applications.

Key Benefits of Converting MOS to EXR:

Floating-Point Precision: 16/32-bit float channels provide extreme dynamic range for VFX compositing
VFX Pipeline Standard: EXR is the industry-standard format for Nuke, Fusion, Flame, and After Effects
Multi-Channel Support: Store RGBA plus depth, normals, motion vectors, and custom channels
HDR Capability: Extreme dynamic range suitable for film production and 3D rendering
3D Rendering Integration: Native format for Arnold, V-Ray, RenderMan, Blender, and all major renderers
Open Source Format: Maintained by Academy Software Foundation, ensuring long-term support
Professional Color Grading: Float precision enables non-destructive color operations without banding or clipping

Practical Examples

Example 1: Leaf Studio Photography for VFX Compositing

Scenario: A VFX team needs Leaf medium format product shots composited with CG environments in Nuke.

Source: studio_product.mos (100 MB, 6668x4992px, 16-bit RAW)
Conversion: MOS → EXR (16-bit half-float)
Result: studio_product.exr (200 MB, 6668x4992px, 16-bit float)

VFX compositing workflow:
1. Process MOS RAW with full color precision
2. Convert to EXR preserving Leaf color science
3. Import into Nuke for product compositing
4. Combine with CG background and lighting
✓ Leaf's exceptional color accuracy preserved
✓ Float precision for professional compositing
✓ Seamless integration with CG render passes
✓ Multi-channel output for complex composites

Example 2: Leaf Archive Conversion for Modern Pipeline

Scenario: A studio converts their legacy Leaf digital back archive to EXR for use in current post-production tools.

Source: leaf_archive/*.mos (300 files, 80-120 MB each)
Conversion: Batch MOS → EXR
Result: leaf_archive/*.exr (300 files, 180-220 MB each)

Archive modernization:
✓ Future-proof open format replacing legacy MOS
✓ Full sensor quality preserved in floating-point
✓ Compatible with all modern compositing tools
✓ Leaf's color science maintained for reuse
✓ Long-term accessibility guaranteed

Example 3: Fashion Photography Plate for CGI Integration

Scenario: A fashion production needs Leaf-captured beauty plates converted to EXR for CG hair and jewelry integration.

Source: fashion_beauty.mos (95 MB, 6668x4992px, 16-bit RAW)
Conversion: MOS → EXR (32-bit float for retouching headroom)
Result: fashion_beauty.exr (400 MB, 6668x4992px, 32-bit float)

Beauty VFX workflow:
✓ 32-bit float for unlimited retouching headroom
✓ CG hair and jewelry compositing in Nuke
✓ Leaf's skin tone accuracy preserved
✓ Non-destructive multi-layer compositing
✓ Billboard-quality output resolution

Frequently Asked Questions (FAQ)

Q: Does converting MOS to EXR preserve Leaf's exceptional color quality?

A: Yes — the conversion processes MOS's 16-bit RAW sensor data into EXR's floating-point channels. Leaf's renowned color accuracy (particularly for skin tones and product colors) is preserved in the sensor data itself. The floating-point EXR provides even more precision than the original 16-bit integer data.

Q: Why convert MOS to EXR instead of TIFF?

A: Use EXR when Leaf images need integration with VFX compositing pipelines (Nuke, Fusion, Flame), 3D rendering workflows, or any production requiring floating-point precision and multi-channel support. TIFF is better for traditional print and photo editing workflows.

Q: How large are EXR files from Leaf digital back MOS files?

A: Leaf digital backs (typically 22-39MP) produce EXR files of 180-280 MB at 16-bit half-float. Uncompressed MOS files start large (80-120 MB), and the EXR representation increases this further. Professional VFX software handles these sizes efficiently.

Q: Is Leaf's color science maintained during conversion?

A: Yes — the sensor's native color characteristics are embedded in the RAW data. Modern RAW processors (rawpy, LibRaw) produce demosaiced images that honor the sensor's color response. Leaf's CCD sensors were particularly valued for their color fidelity, and this quality is preserved.

Q: Can I convert MOS files from all Leaf digital backs?

A: The conversion supports MOS files from Leaf Valeo and Aptus series digital backs. All standard MOS variants are handled through the rawpy/LibRaw library. For newer Phase One-branded backs, IIQ format and its corresponding converter should be used.

Q: What happens to the large uncompressed MOS data?

A: MOS files are uncompressed RAW, so the demosaiced data expands when stored in full RGB floating-point. The EXR file will be 1.5-2.5x the MOS file size. Using EXR compression (ZIP or PIZ) can bring the file size back to similar or smaller than the original MOS.

Q: What color space should I use for the conversion?

A: For VFX compositing, ACEScg (scene-linear, AP1 primaries) is recommended. For general floating-point processing, linear sRGB works well. Always use a linear (scene-referred) color space for EXR output. Your production's color management setup determines the ideal choice.

Q: What software can open the resulting EXR files?

A: EXR is the universal VFX format supported by: Nuke, Fusion, After Effects, Flame, Photoshop, GIMP, Blender, Houdini, Maya, DaVinci Resolve, and virtually every professional creative application. Free viewers include mrViewer, DJV Imaging, and OpenEXR tools.