1. Home
  2. Image Converter
  3. Convert ORF to MEF

What is ORF?

Olympus Raw Format (ORF) contains raw sensor data from Olympus OM-D, PEN, and other Olympus digital cameras.

What is MEF?

Mamiya Raw Format (MEF) is the raw image format from Mamiya/Leaf medium-format digital cameras, preserving full sensor data.

When Should You Use ORF vs MEF?

Use ORF When...

Reach for ORF when your priority is olympus camera raw processing — its uncompromising quality ensures every detail is preserved.

Use MEF When...

Reach for MEF when your priority is medium-format photography, commercial studio — its uncompromising quality ensures every detail is preserved.

ORF vs MEF: Key Differences

  • •ORF and MEF diverge on compression: lossless compression for the source, lossless compression for the target.
  • •Both formats share lossless compression, so quality behavior is similar across the two — file size differences come from algorithm efficiency rather than compression philosophy.
  • •Alpha channel support: MEF lacks transparency support.
  • •ORF files are typically 15-40MB per photo while MEF files range 40-80MB per medium-format image
  • •ORF is optimized for olympus camera raw processing while MEF is designed for medium-format photography, commercial studio — choose based on your specific workflow needs

Advantages of ORF

  • ✓At its core, ORF relies on lossless encoding — a design choice that makes it perfect for Olympus camera raw processing.
  • ✓You won't run into compatibility issues with ORF — it's a universal standard across platforms.
  • ✓File size management with ORF: larger files guaranteed to match the original exactly.
  • ✓Every major application in the Olympus camera raw processing space supports ORF natively.

Advantages of MEF

  • ✓MEF applies lossless compression specifically calibrated for Medium-format photography, commercial studio.
  • ✓MEF enjoys broad native support across operating systems, browsers, and creative tools alike.
  • ✓MEF guarantees every bit of the original data survives — no approximations, no shortcuts.
  • ✓You will find MEF support built into virtually every tool that handles Medium-format photography, commercial studio — no plugins or converters needed.

Common Use Cases for ORF to MEF Conversion

  • Brochure and flyer design
  • Newsletter graphics
  • Video thumbnail creation
  • Certificate and badge design
  • Websites and online content
  • Print materials and publications

Industry Applications

Real Estate PhotographyGame DevelopmentScientific VisualizationE-learning ContentWeb DevelopmentGraphic Design

Best Practices for ORF to MEF Conversion

  • →Before converting ORF to MEF, decide whether you need maximum quality or smallest file size — this determines which format truly fits
  • →Save a master copy in a lossless format before converting to MEF — you cannot recover detail lost during lossy compression
  • →Check the color profile: ORF images may use a wider gamut than MEF supports, causing a visible shift after conversion
  • →Resize images to the final display dimensions before converting — this avoids unnecessary processing of oversized files
  • →Run a single test conversion first to verify quality meets your standards
  • →Strip unnecessary metadata to reduce file size after conversion

Related Article

JPG vs PNG vs WebP: Which Image Format Should You Use?

Learn more about ORF and MEF formats in our detailed guide.

Troubleshooting ORF to MEF Conversion

  • !Converting ORF to MEF gives blurry output → increase the quality setting before conversion
  • !Colors look different in MEF than ORF → check color profile mismatch (sRGB vs Adobe RGB)
  • !File size changed more than expected → MEF uses different compression, file size differences of 2-5x are normal
  • !Transparent areas in ORF turned white in MEF → MEF may not support transparency

Related Image Converters

All Image Formats

View all Image converters →

More Image tools

Convert to MEF →Convert from ORF →

Related Tools

Compress Images →

Convert ORF to MEF Online - Free & Fast

Convert ORF files to MEF online for free. High-quality conversion with no registration required.

Image Converter

Upload or enter a URL to convert ORF to MEF instantly

Click to upload or drag & drop ORF file

or paste from clipboard

.orf,.ORF (max 100MB)

SSL EncryptedAuto-deleted in 1 hourProcessed securelyNo registration needed

Verifying security check…

About ORF and MEF

ORF

ORF (Olympus ORF raw) - Olympus Raw Format, raw image from Olympus cameras. Best for olympus camera raw processing.

MEF

MEF (Mamiya MEF raw) - Mamiya Raw, raw format from Mamiya/Leaf medium-format cameras. Ideal for medium-format photography, commercial studio.

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from olympus camera raw processing to medium-format photography, commercial studio
File Size~40-80MB per medium-format image after conversion

FAQs

Is converting ORF to MEF free?

Yes, GoConvertFile offers free conversion of ORF to MEF for files up to 100MB. No registration required.

How long does it take to convert ORF to MEF?

Most ORF to MEF conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.

What is MEF best used for?

MEF is ideal for medium-format photography, commercial studio. Mamiya Raw, raw format from Mamiya/Leaf medium-format cameras

What file size should I expect after converting ORF to MEF?

File size after ORF to MEF conversion depends on the content complexity and quality settings. Both formats use similar compression approaches so sizes are comparable.

Related Tools

JPG to ORF
Convert JPG to ORF
JPG to MEF
Convert JPG to MEF
PNG to ORF
Convert PNG to ORF
PNG to MEF
Convert PNG to MEF
View all image converter converters
Tune output for this image conversion
80%
Best compressionBest quality