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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 HDR?

Radiance HDR is an image format that stores high dynamic range pixel data, commonly used for HDRI environment maps and lighting.

When Should You Use IIQ vs HDR?

Use IIQ When...

Reach for IIQ when your priority is professional studio photography, digital back capture — its uncompromising quality ensures every detail is preserved.

Use HDR When...

Reach for HDR when your priority is hdri lighting, panoramic photography — its uncompromising quality ensures every detail is preserved.

IIQ vs HDR: Key Differences

  • •IIQ uses lossless compression while HDR uses lossless compression — both take the same approach to file size management.
  • •Since both IIQ and HDR use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
  • •How transparency is handled: HDR supports transparency, so alpha information is preserved during conversion.
  • •File sizes: IIQ files typically range 50-150MB per image from medium-format backs and HDR files 5-30MB for typical HDR maps.
  • •Primary audience: IIQ is built for professional studio photography, digital back capture scenarios, while HDR focuses on hdri lighting, panoramic photography — 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 HDR

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

Common Use Cases for IIQ to HDR 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 IIQ to HDR Conversion

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

Troubleshooting IIQ to HDR Conversion

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

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About IIQ and HDR

IIQ

IIQ (Phase One IIQ raw) - Phase One IIQ, raw format from Phase One medium-format cameras. Best for professional studio photography, digital back capture.

HDR

HDR (HDR images) - Radiance HDR, high dynamic range image format. Ideal for hdri lighting, panoramic photography.

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from professional studio photography, digital back capture to hdri lighting, panoramic photography
File Size~5-30MB for typical HDR maps after conversion

FAQs

Is converting IIQ to HDR free?

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

How long does it take to convert IIQ to HDR?

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

What is HDR best used for?

HDR is ideal for hdri lighting, panoramic photography. Radiance HDR, high dynamic range image format

What file size should I expect after converting IIQ to HDR?

File size after IIQ to HDR conversion depends on the content complexity and quality settings. Both formats use similar compression approaches so sizes are comparable.

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