GIMP Version: 2.10.38
Operating System: Windows
GIMP Experience: Intermediate Level

List any relevant plug-ins or scripts:
Efdge-detect Sobel and Neon
Color curves, auto-equalize and desaturate

List any ERROR messages you received:
No error messages.

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Hello my fellows,
I don't know if this is the right place to ask this kind of question. If it isn't, I apologize, but I'm feeling extremely stupid and I really need your help: I produced an image about 30 days ago and now I can't repeat the steps to get the same effect. Both images, the logo (the original image) and the final result, are attached.

The only clue I have is that I used neon and sobel edge detection types, and maybe color curve, color equalization and color desaturation on the attached logo. Unfortunately, I can't remember anything else. My initial intention was to get a Sketch effect, but I ended up accidentally getting this effect, which I really liked, but unfortunately I don't know how to reproduce it. Five days today trying various alternatives with no success.

I'm sorry to bother you with this stupid question, but at 70 years old my reasoning ability is decreasing and my anxiety is increasing tremendously. Be patient with me, please.

Thank you in advance for your help.

DMerces

Had to open this in a new tabe to really see it. Interesting effect, like the inner glow look to the raised portions.

AdmFubar, thanks for your quick reply.
I already did this. I can see it in another tab or as a layer. My problem, objectively, is that I don't know how I got this effect. And I need to redo it to include the outer edges of the logo. Any clues on how to get this effect from this logo image?

Possibly: Select>Border and then a blur on that border selection. Do you have the XCF workspace file?

Here are my steps.
Create shapes with path tool
Selection from path
Color shapes
Keep selection and go to select>Border
Border width of 3 worked for this size image
New layer under the shape layer
Then i colored the selection border white
Then select none
Blur a small amount
set opacity for the border layer way down.

Wallace and Rod, thanks to both of you I’m finally able to reproduce my steps to obtain the effect I posted and I did no longer remember how I’ve got there. My method does not have the sophistication and technique of the methods all of you suggested. The steps I followed to obtain my effect were completely accidental. It was my birthday and I already had the "inspiration" coming from a few shots of Jack Daniel's.

Thanks your ideas I could reproduce my past steps and even improve the first version of my effect. Here are the steps I followed for the first version and for the improved version, so called because it implements a single color as backlight.

Thank you very much for your time and support and for so many inspirations and lessons with your techniques. Tonight I will sleep really relieved.

Original Effect Version
Steps
1. Set background color to white.
2. Remove Alpha Channel
3. Difference of Gaussians: Edge-detect> Difference of Gaussians | Radius 1=1,000; Radius 2=20,000
4. Color to Alpha: Color>Color to Alpha | Set target color to black.
5. Add any dark background layer and save the image.

Improved Version
Steps:
1. Open the image DM Logo Work.png
2. Set background color to white
3. Equalize: Color> Auto> Equalize
4. Mono Mixer: Color>Desaturate>Mono Mixer | Green =5,000
5. Difference of Gaussians: Edge-detect> Difference of Gaussians | Radius 1=1,000; Radius 2=20,000
6. Color to Alpha: Color>Color to Alpha | Set target color to black.
7. Add any dark background layer and save the image.

It's amazing what a little JD can do for ya! LOL
Glad you figured it out and hope to see more of your work.

Thanks for the steps for this effect. Good stuff!

Thank you Rod. Happy to know that I was able to contribute with something.