Image Formats

Image Formats

VIESUS reads and writes the standard production image formats — JPEG, TIFF, PNG, WebP, and HEIC. RAW input is supported via an experimental loader.

Supported formats

Format	Read	Write	Notes
JPEG	✓	✓	Quality controlled via JpegComprQuality (1 – 100; default 95)
TIFF	✓	✓	Supports alpha channel; common for print production
PNG	✓	✓	Supports alpha channel — required for Background Handling modes 1 and 4
WebP	✓	✓	Modern web format with alpha support
HEIC	✓	✓	iPhone / modern mobile capture; carries HDR gainmaps used by HDR Support
RAW	✓ (experimental)	—	Loaded via the experimental image loader (added in V10). Output is one of the above formats.

Color modes

Color mode	Supported	Notes
RGB	✓	Default working color space
CMYK	✓	Added in V7.50; useful for print pipelines
Grayscale	✓	Added in V7.50
RGBA (with alpha)	✓	Required for Background Handling modes 1 and 4; preserve as PNG, TIFF, or WebP — JPEG does not support alpha

Key caveats

• Alpha channel preservation — save as PNG, TIFF, or WebP. JPEG drops alpha. See Background Handling for the modes that produce alpha output.
• ICC profile handling — embedded ICC profiles in input images are honored. Output profile behavior is controlled by ICC Color Management.
• HDR gainmaps — HEIC inputs (and some JPEGs) can carry gainmaps that HDR Support uses for SDR tonemapping.
• DPI metadata — JPEG, TIFF, PNG and WebP carry DPI metadata. The DPIResolutionSaveMode parameter controls how VIESUS handles it on write — see Parameter Reference → Other.
• RAW loader — experimental, format coverage varies by camera vendor. Verify your specific camera RAW format works before relying on it in production.

Maximum dimensions and file size

Limit	Value
Max input dimensions	No fixed library limit; constrained by available memory
Max output dimensions	Same as input
Cloud API file size	Images 20 KB – 50 MB; PDFs 20 KB – 1,000 MB. See Cloud: Credits