What is PAM?

PAM (Portable Arbitrary Map) is an extension of the NetPBM image format family that supports arbitrary bit depths, multiple color channels, and alpha transparency for image processing toolchains.

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 PAM vs IIQ?

PAM vs IIQ: Key Differences

• •PAM uses lossless compression while IIQ uses lossless compression — both take the same approach to file size management.
• •Neither format changes compression philosophy — both are lossless compression — so any size differences are due to encoding efficiency, not a shift in quality approach.
• •How transparency is handled: IIQ supports transparency, so alpha information is preserved during conversion.
• •PAM files are typically Large uncompressed files, suitable for processing intermediates while IIQ files range 50-150MB per image from medium-format backs
• •Primary audience: PAM is built for image processing pipelines, academic research, format conversion intermediates scenarios, while IIQ focuses on professional studio photography, digital back capture — pick the format that matches your output requirement.

Advantages of PAM

• ✓PAM uses lossless compression tailored for Image processing pipelines, academic research, format conversion intermediates.
• ✓PAM is supported natively on virtually every device, browser, and operating system.
• ✓PAM files are bit-for-bit perfect, preserving every pixel and sample for professional work.
• ✓PAM integrates seamlessly with all major creative tools and workflows.

Advantages of IIQ

• ✓IIQ compresses data using lossless methods, keeping file sizes manageable for Professional studio photography, digital back capture.
• ✓Industry-wide support means IIQ files open anywhere — from legacy systems to the latest devices.
• ✓Lossless quality makes IIQ the gold standard for archival and master copies.
• ✓From Adobe Photoshop to open-source alternatives, IIQ works out of the box.

Common Use Cases for PAM to IIQ Conversion

• Websites and online content
• Print materials and publications
• Social media posts and ads
• Digital photography and editing
• Graphic design projects
• E-commerce product images

Industry Applications

Best Practices for PAM to IIQ Conversion

• →Before converting PAM 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: PAM 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

Troubleshooting PAM to IIQ Conversion

• !Converting PAM to IIQ gives blurry output → increase the quality setting before conversion
• !Colors look different in IIQ than PAM → 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 PAM turned white in IIQ → IIQ may not support transparency

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