ERF to JPS Converter
FileFlip converts ERF to JPS entirely inside your browser, using ImageMagick compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert an ERF file to JPS?#
- Drop your ERF file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to JPS and the conversion starts on its own. FileFlip downloads 14.1 MB of WebAssembly the first time and nothing after that, then runs ImageMagick on your own machine.
- Save the JPS file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting ERF to JPS lose quality?#
Yes, once. ERF keeps everything and JPS does not, so this is the first time the file meets a lossy encoder. At high quality the difference is hard to see, and it is worth keeping the ERF original, because every later re-save of the JPS loses a little more.
Is it safe to convert ERF files online?#
Yes, because nothing is uploaded. FileFlip converts ERF files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What ERF to JPS actually does to the file#
Converting ERF to JPS runs on ImageMagick, downloads 14.1 MB of WebAssembly the first time and nothing after that, encodes a lossless source with a lossy encoder for the first time.
| Engine | ImageMagick |
|---|---|
| Conversion path | One step: ERF → JPS |
| Downloaded to your browser | 14.1 MB, once, then cached by your browser |
| Quality | Lossy, first generation |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
Worth knowing before you start:
- camera raw is demosaiced with ImageMagick's defaults, which will not match the camera's own rendering
- some cameras write lossily compressed raw, so the source is not always a complete sensor record
What is an ERF file?#
An ERF file holds the raw color filter array data from an Epson R-D1 or R-D1s digital rangefinder, wrapped in the TIFF/EP structure alongside an embedded thumbnail and Exif metadata.
Keep a file as ERF only if it is an original R-D1 or R-D1s capture you are archiving unchanged.
Convert ERF to DNG or TIFF for long-term storage or editing in current software, since the only two cameras that ever wrote the format stopped being made years ago.
What is a JPS file?#
A JPS file is an ordinary JPEG photograph that holds two views of the same scene side by side, one for each eye, flagged as a stereo pair by an APP3 marker that most software simply ignores.
Save a stereo pair as JPS when the destination software, such as StereoPhoto Maker or an anaglyph viewer, reads the APP3 stereo marker and the pair needs to travel as one file.
Convert JPS to a plain JPG when only the flat side-by-side image matters, or split it into two separate JPGs when software needs the left and right views on their own.
ERF to JPS questions people ask#
What camera shot this ERF file?
ERF files come from only two cameras, the Epson R-D1 rangefinder released in 2004 and its 2006 update the R-D1s. Epson built the R-D1 with Cosina, pairing a Leica M-mount rangefinder body with Epson's own sensor electronics and image processing.
Can I still open an ERF file?
Yes. ERF files open in RawTherapee, darktable and digiKam through the libopenraw decoding library, and ExifTool reads their embedded Exif metadata. Epson never updated its own raw software after leaving the camera market, so a current raw processor is the practical option.
What should I convert ERF files to?
Converting ERF to DNG or TIFF is worth doing for long-term storage, since Epson exited the camera body business in 2014 and no software vendor has a reason to add new support for a format tied to two discontinued cameras.
What is a JPS file?
A JPS file is a standard JPEG image containing two side-by-side views of the same scene, one per eye, for stereoscopic 3D viewing. An APP3 marker inside the file identifies it as a stereo pair, but the underlying image data is ordinary JPEG.