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What is MEF?

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

What is BPG?

Better Portable Graphics (BPG) is a modern image format based on HEVC video compression, offering excellent compression efficiency.

When Should You Use MEF vs BPG?

Use MEF When...

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

Use BPG When...

Reach for BPG when your priority is web images with superior compression — its efficient compression makes sharing fast and storage minimal.

MEF vs BPG: Key Differences

  • •The core technical difference: MEF relies on lossless compression whereas BPG uses lossy compression.
  • •Converting from MEF to BPG changes compression type: lossy source becomes smaller but with some quality tradeoff.
  • •How transparency is handled: BPG does not support alpha channels — transparent areas in the source will become opaque.
  • •Storage footprint: 40-80MB per medium-format image for MEF vs 30-50% smaller than JPEG at same quality for BPG.
  • •Use case fit: MEF targets medium-format photography, commercial studio and BPG targets web images with superior compression — your choice depends on which workflow stage you are serving.

Advantages of MEF

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

Advantages of BPG

  • ✓The lossy nature of BPG means file sizes stay reasonable while handling Web images with superior compression efficiently.
  • ✓From mobile devices to enterprise servers, BPG is recognized and supported everywhere.
  • ✓Storage and bandwidth costs drop significantly when using BPG thanks to its efficient compression.
  • ✓BPG is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Common Use Cases for MEF to BPG Conversion

  • Email marketing campaigns
  • Presentation graphics
  • Blog and article illustrations
  • Mobile app UI assets
  • Product photography for marketplaces
  • Digital art portfolios

Industry Applications

Digital ArtUI/UX DesignAdvertisingBrand ManagementContent ManagementMedical Imaging

Best Practices for MEF to BPG Conversion

  • →Before converting MEF to BPG, 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 BPG — you cannot recover detail lost during lossy compression
  • →Check the color profile: MEF images may use a wider gamut than BPG 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 MEF and BPG formats in our detailed guide.

Troubleshooting MEF to BPG Conversion

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

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About MEF and BPG

MEF

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

BPG

BPG (BPG images) - Better Portable Graphics, high-efficiency image codec. Ideal for web images with superior compression.

Format Comparison

CompressionLossless → Lossy
TransparencyN/A
Use CaseConvert from medium-format photography, commercial studio to web images with superior compression
File Size~30-50% smaller than JPEG at same quality after conversion

FAQs

Is converting MEF to BPG free?

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

How long does it take to convert MEF to BPG?

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

What is BPG best used for?

BPG is ideal for web images with superior compression. Better Portable Graphics, high-efficiency image codec

Does converting MEF to BPG lose quality?

Yes, converting MEF to BPG uses lossy compression, which reduces file size by discarding some visual data. Set quality to 85-95% for a good balance of quality and file size.

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

BPG files are typically 50-80% smaller than MEF files because BPG uses efficient lossy compression. The exact reduction depends on quality settings.

Will transparency be preserved when converting MEF to BPG?

No, BPG does not support transparency. Any transparent areas in your MEF will be filled with a solid color (usually white) during conversion. Use PNG or WebP if transparency is needed.

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