SFW to VIFF Converter

Turn SFW photographs into VIFF images for free online

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Browser-Based Tool

No downloads or plugins needed — convert SFW to VIFF directly in your web browser on any operating system or device.

Multi-File Processing

Queue several SFW files at once and convert them all to VIFF simultaneously. Batch mode streamlines repetitive conversion work.

Quick Turnaround

Most SFW files convert to VIFF within moments. Server-side processing ensures speed regardless of your device capabilities.

How to convert SFW to VIFF

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose viff or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your viff file right afterwards

About formats

SFW is a proprietary image format created by Seattle FilmWorks (later PhotoWorks) for their Pictures on Disk mail-order photo service, active primarily from 1994 through the early 2000s. Customers who sent film to Seattle FilmWorks for developing could opt to receive their photos back on 3.5-inch floppy disks in addition to (or instead of) traditional prints. SFW files contained the scanned photographs in a JPEG-based encoding wrapped in a custom header, designed to be viewed through Seattle FilmWorks' proprietary desktop software. The service was notably popular in the mid-1990s, offering one of the most accessible ways for ordinary consumers to obtain digital versions of their film photographs before consumer scanners and digital cameras became affordable. SFW files typically contained modest-resolution scans appropriate for screen viewing and small prints — sufficient quality for the 640x480 and 800x600 monitor resolutions common at the time. One advantage of SFW files is their role as historical artifacts: for many families, SFW disks represent the only digital copies of film-era photographs from the 1990s, preserved on media that predates widespread home scanning and digital photography. The underlying JPEG data ensures reasonable image quality despite the proprietary wrapper. Extracting images from SFW files is straightforward: tools like XnView, ImageMagick, and specialized SFW-to-JPEG converters can strip the proprietary header and save the standard JPEG data, making these nostalgic files accessible on any modern device.
Developer: Seattle FilmWorks
Initial release: 1994
VIFF (Visualization Image File Format) is a scientific image format developed by Khoral Research (originally at the University of New Mexico), first appearing around 1990 with the Khoros visual programming environment for image processing and data visualization. VIFF files use a 1024-byte header followed by optional color map data, and the image data itself, with the header containing detailed specifications: data storage type (bit, byte, short, integer, float, double, complex), data encoding (none, CCITT Group 3/4), color space model (none, generic, RGB, HSI, CMYK, and others), and support for multi-band (multi-channel) images with arbitrary numbers of bands. The format accommodates one-dimensional signals, two-dimensional images, three-dimensional volumes, and location data (sparse pixel coordinates), making it versatile beyond simple image storage. VIFF was designed for the Khoros/VisiQuest visual dataflow programming environment, where users constructed image processing pipelines by connecting processing nodes in a graphical canvas — an approach that influenced later systems like AVS, MATLAB Simulink, and LabVIEW. One advantage is scientific data fidelity: VIFF supports the full range of numeric types used in scientific computing (including complex numbers and double-precision floats), stores multi-band datasets natively, and carries calibration metadata — making it suitable for remote sensing, medical imaging, and spectral analysis applications where generic image formats lose information. The format's connection to the Khoros visual programming paradigm provides another notable dimension — VIFF was the standard I/O format for one of the most influential early visual programming environments for scientific image analysis. VIFF files can be read by ImageMagick and legacy Khoros/VisiQuest installations.
Developer: Khoral Research
Initial release: 1990

Frequently Asked Questions

Why convert SFW to VIFF?

Seattle FilmWorks locked photos in a proprietary format. Converting SFW to VIFF frees your personal photographs for modern use.

What programs can open VIFF?

Khoros/VisiQuest visualization software opens VIFF natively. ImageMagick and XnView can also import VIFF image data files.

How accurate is SFW to VIFF conversion?

VIFF preserves image data without lossy compression, so the visual content from your SFW is retained faithfully during conversion.

How quickly can I convert SFW to VIFF?

Conversion is handled on cloud servers and usually completes in a few seconds. Larger or higher-resolution SFW images may take slightly longer.

Does Convertio support batch SFW to VIFF conversion?

Absolutely. Add several SFW images at once, set VIFF as the output, and the converter processes them all in parallel for maximum efficiency.

What happened to Seattle FilmWorks?

The company closed in the early 2000s, leaving SFW photos stranded. Convertio lets you recover those images by converting to VIFF.