What is IIQ?

Phase One IIQ is a professional medium-format raw format used by Phase One digital backs, delivering exceptional image quality for commercial photography.

What is PEF?

Pentax Electronic Format (PEF) contains raw sensor data from Pentax digital SLR and mirrorless cameras.

When Should You Use IIQ vs PEF?

IIQ vs PEF: Key Differences

• •IIQ uses lossless compression while PEF uses lossless compression — both take the same approach to file size management.
• •Since both IIQ and PEF use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
• •Transparency: N/A
• •File sizes: IIQ files typically range 50-150MB per image from medium-format backs and PEF files 15-45MB per photo.
• •Primary audience: IIQ is built for professional studio photography, digital back capture scenarios, while PEF focuses on pentax camera post-processing — pick the format that matches your output requirement.

Advantages of IIQ

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

Advantages of PEF

• ✓The lossless nature of PEF means file sizes stay reasonable while handling Pentax camera post-processing efficiently.
• ✓From mobile devices to enterprise servers, PEF is recognized and supported everywhere.
• ✓The trade-off for PEF's perfection is larger files — but for archival work, it is worth every megabyte.
• ✓PEF is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Common Use Cases for IIQ to PEF Conversion

• Digital art portfolios
• Brochure and flyer design
• Newsletter graphics
• Video thumbnail creation
• Certificate and badge design
• Websites and online content

Industry Applications

Best Practices for IIQ to PEF Conversion

• →When converting IIQ to PEF, check whether PEF supports transparency — if not, your transparent areas will be filled with a solid color
• →Use PEF for maximum quality archival and IIQ for lossless workflows
• →Optimize images for web to reduce page load times — tools like our converter let you adjust quality settings before conversion
• →Maintain original aspect ratio to avoid distortion during conversion
• →Always keep a backup of your original files before converting
• →Choose the appropriate quality settings for your specific use case

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Troubleshooting IIQ to PEF Conversion

• !PEF shows visible compression artifacts → lower the compression level or switch to a lossless variant
• !The converted PEF image looks washed out → the source IIQ likely uses a wider color space than PEF supports
• !PEF file is much larger than expected → check if the conversion preserved an unnecessarily high resolution
• !Text in the converted PEF looks fuzzy → text-heavy images benefit from higher quality settings or a different output format

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