SFW to JPG

Description

This project provides tools to convert Seattle FilmWorks (SFW) image formats to JPEG.

Seattle FilmWorks was a mail order film processing company that offered the option of digitizing images while processing the film. The files were delivered back to their clients in a proprietary file formats: SFW and PWP. SFW files were stored on disks and sent along with the processed photos and the PWP format was used to provide a download option over the Internet.

Everett Lipman created two programs, sfwjpg and pwpjpg to convert from the Seattle FilmWorks's private file formats to JFIF (JPEG File InterchangeFormat). He also created flipjpeg which can be used to flip the JPEG images. Everett opensourced these under the GNU General Public License.

Build Instructions

sfwjpg.c and pwpjpg.c are standalone ANSI C programs which should compile without any modifications under UNIX. Compilation under Windows with Microsoft Visual C++ requires that the strcasecmp() function, which occurs in both programs, be replaced with strcmp().

• Successful builds on: MacOS, Linux and RPi

Build using Makefile

make
cc -o pwpjpg pwpjpg.c
cc -o sfwjpg sfwjpg.c

Testing: An example.sfw file is included in this repo. You can run make test to build the jpg version.

Usage

sfwjpg - Convert images in SFW file to JPG

sfwjpg will take a single .sfw file and convert it into a .jpg (JFIF) file. The image in the newly created .jpg file will then need to be flipped vertically. sfwjpg takes one or two arguments, the name of the .sfw file to be converted, and an optional output file:

sfwjpg mypic.sfw

This will create the file mypic.jpg in the current directory. mypic.sfw will not be altered or removed. Under Microsoft Windows, sfwjpg.exe must be invoked from the run window command line.

sfwjpg mypic.sfw foo.jpg

This will convert mypic.sfw and leave the result in foo.jpg.

sfwjpg mypic.sfw -

This will convert mypic.sfw and write the result to the standard output.

pwpjpg - Extract images from PWP File

pwpjpg will take a .pwp file and extract the images in the file. A .pwp file typically contains the scanned images from an entire roll of film. The names of the images are contained within the .pwp file. pwpjpg takes a single argument, the name of the .pwp file from which to extract the images:

pwpjpg mypics.pwp

This will extract all of the images contained in mypics.pwp and write them in the current directory as .jpg (JFIF) files. The file names will correspond to the names of the images stored in the .pwp file. mypics.pwp will not be altered or removed. Under Microsoft Windows, pwpjpg.exe must be invoked from the run window command line.

pwpext - Extracts and flips images in a PWP File

pwpext is a UNIX (Bourne) shell script which extracts and flips the images from a .pwp file. It takes a single argument, the name of the .pwp file:

pwpext mypics.pwp

This will extract, flip, and store as .jpg files all of the images contained in mypics.pwp. mypics.pwp will not be altered or removed.

** NOTE this requires building flipjpeg

flipjpeg - Flip JPEG Images

flipjpeg can be used to JPEG images. It uses the Independent JPEG Group's (IJG) free JPEG software, which you can find at https://www.ijg.org/. flipjpeg uses standard input and output. In order to compile flipjpeg.c, unpack the IJG software and place flipjpeg.c in the same directory. After running 'configure' to create the Makefile for the IJG software, add the following lines to Makefile:

FJOBJECTS= flipjpeg.o rdswitch.o cdjpeg.o

flipjpeg: $(FJOBJECTS) libjpeg.a
    $(LN) $(LDFLAGS) -o flipjpeg $(FJOBJECTS) libjpeg.a $(LDLIBS)

Credit and Revision History

• Original code and Copyright (c) 1997-1999 by Everett Lipman
• Uploaded to Github with updated documentation and Makefiles - Jason Cox @jasonacox https://github.com/jasonacox/sfw2jpg

References

• Seattle FilmWorks: https://en.wikipedia.org/wiki/Seattle_FilmWorks
• SFW93A format and conversion details: https://jonesrh.info/sfw/sfw_sfw93a_details.html