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  1. Hello Robert,

    thanks for your wonderful introductions to darktable. They are really the best tutorials I ever see. I love to look over your shoulder to view, how to get the best out of a photo.

    But now to the point why I contact you:
    The last step is to export an image to JPG, but what is the best and preverred way for it when you have several different formats?
    1800×1200 (3:2) for printing in a photographic laboratory, 800×600 (4:3) for a digital photo frame, 1920×1080 (16:10) for viewing at a PC, 2560×1600 (16:10) for viewing at a Tablet, …
    Is there a trick to handle portrait and landscape formats when you need to define the output pixel to get a accurate size or do I have to seperate portrait formats from landscape format?

    I would be verry happy if you could get the time to send me an answer. Maybe this topic could be an idea for a new tutorial video?

    (PS. Please excuse my English, I hope you will understand what I mean…)

    Best regards
    Christoph Dunschen

    • Hi Christoph,

      I’m glad you enjoyed the videos!

      I suggest that you do all of the development of the image, then duplicate it (using the button on the right panel of the lightroom) so that you have one image per aspect ratio you want, then apply a different crop to each duplicate. That way you get to choose exactly how you want the image cropped for each aspect ratio.

      Then you can just export all of the images leaving the pixel size at default (0x0).

      Alternatively if you wanted to export the image once and then automatically prepare a set of crops, I suggest you have a look at the imagemagick command line suite (“convert” is probably the one you want) to run through and crop all your images automatically. Let me know if you’d like and I could write a snippet of bash to do this for you (I’m away from my computer right now).



      • I second Robert’s advice about duplicates. Before I first edit a picture, I make a duplicate so I have a straight-of-the-camera version. If I come back later to re-edit, I duplicate so I have the original edit history stack all safe and sound. If I want different edits of the picture (e.g. colour and monochrome) I duplicate. All it costs is another sidecar file, which is teeny tiny. There is even a handy shortcut, Ctrl-D in lighttable mode will duplicate whatever’s currently selected. Be aware that the duplicate inherits the star ranking, tags etc. of the original but these can then be changed (for instance, in the case you suggest I’d add the tag “3×2” or “4×3” to the duplicates depending on the crop you’ve taken).


  2. Your darktable YouTube tutorials are very well done. Thank you very much for putting them together.
    I noticed in a couple videos that you have a prepared outline/notes/episode guide that you reference during the videos. If possible, could you share those as well? I think it would really help me and other viewers to follow along, as well as be a great reference for when we attempt to apply your techniques to our own photos.

    • Hi Casey,

      Sadly it looks like I didn’t keep those documents with my video files, so I don’t have them any more. Any future videos I do will have proper blog posts associated with them though.



  3. Robert,
    The tutorials are invaluable. I’ve only recently developed an interest in working on my RAW files, beyond just
    “Developing” the image so that they are usable. Ive been using the gimp for a number of years, but being rather lazy I’ve never gone beyond basic editing. My excuse of course being that my preference is for minimal intervention. I started to investigate RAW editors with the intention of processing and converting them so I didn’t need to use the gimp.
    I’ve been fiddling around with lightzone for a while now, but wasn’t happy with the output. It’s actually a rather nice package, but because of my lack of knowledge of basic editing skills, I couldn’t resolve the problems I was encountering.
    It’s only in the last few weeks that I’ve discovered darktable and apart from a reasonably steep learning curve initially, I’m rather liking what I’m seeing. Your tutorials are the main reason for that. Not only do they demonstrate how to use darktable but I’m actually picking up editing techniques.
    Sorry verbal diorrhea, but I thought I should thank you .

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