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I've installed Gimp via brew on my Mac. This is the error when trying to open a raw image:

enter image description here

I've installed ufraw (also via brew). That is supposed to integrate with Gimp, but I didn't notice any difference. There is now a ufraw-batch executable on the command line, but no one for ufraw. From what I read, I thought I should be able to run ufraw standalone; but I don't know how.

I also tried to convert the image with imagemagick:

magick I0000002.raw image.jpg

but that didn't work either:

magick: Unsupported file format or not RAW file `I0000002.raw' @ error/dng.c/ReadDNGImage/516.

Lastly I tried RawTherapee, but that doesn't seem to have a working file selection dialog: I couldn't even navigate to the file I wanted to open!

Is there an easy, free way to open/convert a raw image on Mac or Linux?

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    Check for Adobe Digital Negative Converter (for Mac, there is no linux version). Convert to DNG. And almost any image editor will be able to open it: helpx.adobe.com/bg/camera-raw/using/adobe-dng-converter.html
    – Romeo Ninov
    Commented Aug 10, 2022 at 19:48
  • Raw is not a single well-defined format. If anything is able to open your raw image, it's only because it knows this particular raw format. Can you tell anything about the raw image? What device is it from? Currently your question says nothing about the file itself, it may be any raw format. There is no information to even take an educated guess. Answers may be "try this" and if anything works then it will be because we're lucky to guess right. Unless you say something useful about the raw file.
    – Kamil Maciorowski
    Commented Aug 10, 2022 at 20:10
  • The image comes from an ultrasound scanner. I don't know the brand; would've to go to the doctor to ask. Interesting though, I didn't know that raw wasn't well-defined.
    – user1785730
    Commented Aug 10, 2022 at 20:17
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    Did you follow this clue? The file may or may not really be HDF5; but in my Ubuntu the description of h5utils package says "HDF5 is a format for storing scientific data", then there is silx: "toolbox for X-Ray data analysis". Therefore I think an image from an ultrasound scanner may be genuinely in this format.
    – Kamil Maciorowski
    Commented Aug 11, 2022 at 4:51
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    If you'd care to share the file, using something like Dropbox or Google Drive, and anything you know about it, it may be possible to help you better. Useful info would be the name and a link to the device that created the image, the images width and height in pixels, whether it is colour or grayscale, whether it is 8-bit, 10-bit, 16-bit etc.
    – Mark Setchell
    Commented Oct 11, 2022 at 10:33

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