What is PEF?

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

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.

When Should You Use PEF vs IIQ?

PEF vs IIQ: Key Differences

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

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.

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.

Common Use Cases for PEF to IIQ 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 PEF to IIQ Conversion

• →When converting PEF to IIQ, check whether IIQ supports transparency — if not, your transparent areas will be filled with a solid color
• →Use IIQ for maximum quality archival and PEF 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 PEF to IIQ Conversion

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

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