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What is HDR?

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

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 HDR vs IIQ?

Use HDR When...

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

Use IIQ When...

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

HDR vs IIQ: Key Differences

  • •The core technical difference: HDR relies on lossless compression whereas IIQ 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
  • •File sizes: HDR files typically range 5-30MB for typical HDR maps and IIQ files 50-150MB per image from medium-format backs.
  • •Primary audience: HDR is built for hdri lighting, panoramic photography scenarios, while IIQ focuses on professional studio photography, digital back capture — pick the format that matches your output requirement.

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.

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 HDR to IIQ 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 HDR to IIQ Conversion

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

Troubleshooting HDR to IIQ Conversion

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

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Convert HDR to IIQ Online - Free & Fast

Convert HDR files to IIQ online for free. High-quality conversion with no registration required.

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About HDR and IIQ

HDR

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

IIQ

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

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from hdri lighting, panoramic photography to professional studio photography, digital back capture
File Size~50-150MB per image from medium-format backs after conversion

FAQs

Is converting HDR to IIQ free?

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

How long does it take to convert HDR to IIQ?

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

What is IIQ best used for?

IIQ is ideal for professional studio photography, digital back capture. Phase One IIQ, raw format from Phase One medium-format cameras

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

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

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