Seattle FilmWorks

Readable

image

Seattle FilmWorks was a mail order film processing company. Digitised photographs made by the company used a family of proprietary raster image formats known as SFW and PWP (PhotoWorks PhotoMail). The SFW format has a compressed version based on JPEG, and an uncompressed version based on BMP.

Identify it

Extensions	`.sfw.pwp.pwm.alb`
MIME types	`image/x-seattle-filmworks`
Signatures	`534657393441` at byte 0 (Seattle FilmWorks Image 94A variant) `534657393841` at byte 0 (Seattle FilmWorks Image 98A variant) `5346575f414c42` at byte 0
PRONOM	`fmt/1104`
Wikidata	`Q28207261`

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Open it

AbydosOpen sourcereads · GNU Lesser General Public License
ConverseenOpen sourcereads · GNU General Public License, version 3.0
ImageMagickOpen sourcereads · ImageMagick License
Photo Suite II SEreads and writes
PhotoSuite III SEreads and writes
IrfanViewreads · freeware
PhotoWorks 2.41reads

Convert it

To	With	Fidelity	Command and losses
Portable Network Graphics	ImageMagick	Lossless	`convert in.pwp out.png` Pixels kept; some metadata, colour profiles or layers may be dropped.
Tagged Image File Format	ImageMagick	Lossless	`convert in.pwp out.tif` Pixels kept; some metadata, colour profiles or layers may be dropped.
GIF 89a	ImageMagick	Lossy	`convert in.pwp out.gif` Reduced to 256 colours.
JPEG File Interchange Format 1.02	ImageMagick	Lossy	`convert in.pwp out.jpg` Lossy compression.
WebP	ImageMagick	Lossy	`convert in.pwp out.webp` Lossy compression.

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.

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