What is CGM?

Computer Graphics Metafile (CGM) is a vector and raster graphics format for technical illustrations and engineering diagrams.

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 CGM vs IIQ?

CGM vs IIQ: Key Differences

• •CGM uses lossless compression while IIQ uses lossless compression — both take the same approach to file size management.
• •Since both CGM and IIQ use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
• •Alpha channel support: IIQ lacks transparency support.
• •CGM files are typically Compact for vector drawings while IIQ files range 50-150MB per image from medium-format backs
• •Use case fit: CGM targets technical illustrations, engineering diagrams and IIQ targets professional studio photography, digital back capture — your choice depends on which workflow stage you are serving.

Advantages of CGM

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

Advantages of IIQ

• ✓IIQ uses lossless compression tailored for Professional studio photography, digital back capture.
• ✓IIQ is supported natively on virtually every device, browser, and operating system.
• ✓IIQ files are bit-for-bit perfect, preserving every pixel and sample for professional work.
• ✓IIQ integrates seamlessly with all major photo editing tools and workflows.

Common Use Cases for CGM to IIQ Conversion

• Digital photography and editing
• Graphic design projects
• E-commerce product images
• Email marketing campaigns
• Presentation graphics
• Blog and article illustrations

Industry Applications

Best Practices for CGM to IIQ Conversion

• →When converting CGM to IIQ, check whether IIQ supports transparency — if not, your transparent areas will be filled with a solid color
• →Use IIQ for maximum quality archival and CGM 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 CGM to IIQ Conversion

• !IIQ shows visible compression artifacts → lower the compression level or switch to a lossless variant
• !The converted IIQ image looks washed out → the source CGM likely uses a wider color space than IIQ supports
• !IIQ file is much larger than expected → check if the conversion preserved an unnecessarily high resolution
• !Text in the converted IIQ looks fuzzy → text-heavy images benefit from higher quality settings or a different output format

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