What is PEF?

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

What is FITS?

Flexible Image Transport System (FITS) is a scientific data format used primarily in astronomy for storing and transmitting images and datasets.

When Should You Use PEF vs FITS?

PEF vs FITS: Key Differences

• •The core technical difference: PEF relies on lossless compression whereas FITS uses lossless compression.
• •Neither format changes compression philosophy — both are lossless compression — so any size differences are due to encoding efficiency, not a shift in quality approach.
• •Transparency: N/A - Scientific data format
• •PEF files are typically 15-45MB per photo while FITS files range Varies from 1MB to several GB
• •PEF is optimized for pentax camera post-processing while FITS is designed for astronomy, scientific imaging, research — choose based on your specific workflow needs

Advantages of PEF

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

Advantages of FITS

• ✓FITS applies lossless compression specifically calibrated for Astronomy, scientific imaging, research.
• ✓FITS enjoys broad native support across operating systems, browsers, and creative tools alike.
• ✓FITS guarantees every bit of the original data survives — no approximations, no shortcuts.
• ✓You will find FITS support built into virtually every tool that handles Astronomy, scientific imaging, research — no plugins or converters needed.

Common Use Cases for PEF to FITS Conversion

• Social media posts and ads
• Digital photography and editing
• Graphic design projects
• E-commerce product images
• Email marketing campaigns
• Presentation graphics

Industry Applications

Best Practices for PEF to FITS Conversion

• →When converting PEF to FITS, check whether FITS supports transparency — if not, your transparent areas will be filled with a solid color
• →Use FITS 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 FITS Conversion

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

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