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Olympus and OM System ORF raw files that will not open on a Mac

· 6 min read

An ORF file that will not open on a Mac is usually not broken. ORF is the raw format of Olympus cameras and of the newer bodies sold under the OM System name, and macOS learns to read each camera separately, through system updates. A camera released after your version of macOS, or a file from a special shooting mode, can show a thumbnail in Finder and still refuse to open in Preview or Photos. Update macOS first, then work down the list below.

One extension, two names on the camera

The Olympus camera business changed hands, and its newer bodies carry the OM System name, but they still write .ORF files. That matters when you look up support. Apple’s list of supported cameras names each model separately, and an older Olympus body appearing there says nothing about a recent OM System one. Match the exact model name printed on your camera, including any Mark number.

Why Finder shows the picture and Preview will not

An ORF carries the sensor data plus a JPEG preview the camera made for its own screen. Finder and Quick Look can display that preview without decoding the raw data, so a thumbnail only proves the front of the file is readable. Whether your Mac can develop the full picture is a separate question, and the test below answers it.

The files most likely to cause trouble

  • A new body. Support for a camera arrives in a macOS update, sometimes months after the camera goes on sale.
  • High Res Shot. This mode combines several exposures into one raw file far larger than a normal frame. Support for those files can be missing even when ordinary files from the same camera open, so test one before you rely on it.
  • An .ORI file beside it. On many bodies a High Res Shot also saves an .ORI file: an ordinary raw of a single frame under a different extension, which macOS does not recognize. Duplicate it in Finder (File, Duplicate) and rename the copy to .ORF. If the camera is supported, it opens like any other raw.
  • A short copy. A card pulled out early, or a reader that dropped its connection, leaves a file with the preview at the front and nothing behind it.

Test whether your Mac can decode the file

Open the file in Preview. If the picture fills the window at full resolution, the Mac can read it. For a clearer answer, run this in Terminal, dragging your own file in place of the example path:

sips -g pixelWidth -g pixelHeight ~/Pictures/PA060001.ORF

If sips prints the dimensions, the raw decoder worked. If it prints an error, macOS could not decode the file, whatever the thumbnail suggests.

To spot a short copy, go to the folder in Terminal and list the smallest files:

ls -lS *.ORF | tail -5

ORF sizes vary with the scene, so only a file dramatically smaller than its neighbors is suspect.

The fixes, in order

  1. Update macOS. Open System Settings, General, Software Update. Camera support ships inside these updates, and this settles most cases.
  2. Check Apple’s list. Apple publishes a support page of the cameras whose raw files macOS can read. Look for your exact model and read any note beside it.
  3. Develop it in the camera. Many of these cameras can turn a raw file into a JPEG after the fact: look for RAW Data Edit among the editing options in the playback menu, and check the manual if you cannot find it. It is slow one photo at a time, but it needs no computer.
  4. Use the camera maker’s software. The maker offers free desktop raw software for its cameras, including the older Olympus bodies, and it exports JPEG and TIFF.
  5. Convert to DNG. A DNG converter rewrites the ORF in an openly documented raw format that macOS can usually read without knowing the camera.
  6. Shoot RAW and JPEG until the Mac catches up. Setting image quality to RAW plus a JPEG gives every shot a file that opens anywhere.

Converting ORF to JPEG once the Mac can read it

Preview, one photo. Open the ORF, choose File, Export, set Format to JPEG, and save.

Finder, a handful. Select the files, right-click, and choose Quick Actions, Convert Image. Pick JPEG and a size.

Terminal, a folder. In the folder with the photos, run:

for f in *.ORF; do sips -s format jpeg -s formatOptions 90 "$f" --out "${f%.*}.jpg"; done

Manatee, a whole card. Manatee converts a folder in one drop. Open it, choose Convert, drop the folder in, and pick JPEG, PNG, HEIC or TIFF. Each result is written as a new copy beside its original, and the ORF is never modified. It runs entirely on the Mac with nothing uploaded, and it is free for 24 hours with every feature, then $9 once.

Two honest limits. Do not count on any converter, Manatee included, to read a camera newer than the software knows. If a file fails in Preview, sort out support with the steps above, or try one file during the free 24 hours before relying on it for a whole trip. And Manatee is not a raw editor: there is no exposure slider and no white balance control. How to convert raw photos to JPEG on a Mac compares the routes in more depth.

Why the JPEG looks flatter than the camera’s

The camera’s own JPEGs carry its Picture Mode, any Art Filter you chose, and its contrast and sharpening settings. The raw data has none of that, and macOS develops it with a neutral default, so a flatter, less saturated result is normal rather than a fault. For the camera’s look, develop the file in the camera or in the maker’s software, both of which can apply the same modes. A photo that looks dull after converting it covers the other reasons color shifts in a conversion.

When the file really is damaged

If the maker’s software refuses the file too, or it is far smaller than the others, you are past a support problem.

  • Copy it from the card again, with a different reader or cable if you have one. Do not format the card until every file has been checked.
  • Save at least the preview. In the folder in Terminal, qlmanage -t -s 2000 -o ~/Desktop PA060001.ORF writes a PNG of whatever Quick Look can show, up to 2000 pixels wide.
  • Be realistic about repair. Manatee’s Repair mode is built for corrupt video, PDF and Word documents, not raw photos, and Manatee does not recover photos deleted from a card. Sensor data that never reached the card cannot be rebuilt by any tool.

Whether a corrupted photo can be repaired sets out what to expect.

Questions

Why do my older Olympus files open when the new camera’s do not? Support is added per model. The older body has been on Apple’s list for years; the new one arrives in a later update.

Is it safe to rename an .ORI file to .ORF? Do it on a copy. Renaming does not change the data, and on cameras that write .ORI files the contents are an ordinary raw, which is why the rename works.

Should I keep the ORF files after converting? Yes. The JPEG is one finished rendering with much of the sensor’s latitude discarded. Keep the ORF as the original so you can develop it differently later.