What is PEF?

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

What is ARW?

Sony Alpha Raw (ARW) is Sony's proprietary raw image format containing unprocessed sensor data from Sony Alpha and Cyber-shot cameras.

When Should You Use PEF vs ARW?

PEF vs ARW: Key Differences

• •PEF and ARW diverge on compression: lossless compression for the source, lossless compression for the target.
• •Since both PEF and ARW use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
• •Transparency: N/A
• •PEF files are typically 15-45MB per photo while ARW files range 20-40MB per photo
• •PEF is optimized for pentax camera post-processing while ARW is designed for sony camera post-processing, professional editing — choose based on your specific workflow needs

Advantages of PEF

• ✓PEF compresses data using lossless methods, keeping file sizes manageable for Pentax camera post-processing.
• ✓Industry-wide support means PEF files open anywhere — from legacy systems to the latest devices.
• ✓Lossless quality makes PEF the gold standard for archival and master copies.
• ✓From professional software to open-source alternatives, PEF works out of the box.

Advantages of ARW

• ✓ARW applies lossless compression specifically calibrated for Sony camera post-processing, professional editing.
• ✓ARW enjoys broad native support across operating systems, browsers, and creative tools alike.
• ✓ARW guarantees every bit of the original data survives — no approximations, no shortcuts.
• ✓You will find ARW support built into virtually every tool that handles Sony camera post-processing, professional editing — no plugins or converters needed.

Common Use Cases for PEF to ARW Conversion

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

Industry Applications

Best Practices for PEF to ARW Conversion

• →Before converting PEF to ARW, 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 ARW — you cannot recover detail lost during lossy compression
• →Check the color profile: PEF images may use a wider gamut than ARW 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

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Troubleshooting PEF to ARW Conversion

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

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