How I can see the preview when I put framing in the photo?
Welcome aboard…which product are you using?
Sorry, I’m using Rawtherapee
I can’t see just is possible when I save the image
I haven’t used RawTherapee, so I’ll leave it to someone else to give you a better/current answer.
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I think you only see the frame after saving the image
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Hey @santiago_olaran I don’t think you can. I use RT, and adjust my frames as required… but don’t get a preview. I kind of know when I want black, grey or white, or none. Often based on my preference for background colour whilst editing and changing the background colour of the editor to suit.
Oh, and I generally like thin frames, adjusted down to 0.02 or 0.04. After playing a bit you can do fancy things with colour, but I just go with a few options.
Anyway, welcome… There are a good few RT users here on this forum and always happy to help. Have you seen this post regarding new developments, there is a good link embedded to the Hugo site, which has the latest tutorials (and hopefully be publised soon)? RawPedia - Hugo - News
Hopefully to you’ll find this helpful, even though it’s not specific to frames 
Ask away if you have other questions… I’m not expert, but happy to chat 