My first contribution on this category (applying artistic effects)

Original here (one of my summer photos):



Transformed image:



obtained by applying Garagecoder's "Aurora" (default parameters: 6,1,0) on a new layer
setting layer mode to Overlay 100%
duplicating the "Aurora" layer
reducing opacity to 90% (keeping Overlay mode)

my second contribution

original here (one of my summer photos):



transformed into:



obtained by:
- applying David's filter Gradient Norm on a new layer (default parameters)
- setting layer mode to Difference

That is very interesting, I'll try your steps on my photos. Thanks

another experiment

original



modified



1-black crayon graffiti on a new layer (active)
2-mode to "difference"
3-new layer from visible
4-mode to overlay

I tried your methods on this photo. I changed the layer mode, too. I like because it gives an original look to the photos.

yes, Gimp-G'MIC is like a treasure island, you have to explore it!

another attempt, with one of my favs: Psychedelic Glasswork

original image


creating a new layer using psychedelic glasswork then mode=multiply


same as above, but using mode=overlay

another again
used watercolor on top, then multiplied
look how this filter can be used to improve dramatically the details of thye photo!

original


modified

Absolutely right! These steps give the photo a lot of enhancement. My try

yeah, edges are much better defined...

never look at outcomes generated by GMIC-isophotes?
interesting!
here Alicia and her dog-friend (using 16 as parameter)

Original:

Filtered:

I duplicated the original, apply repair-> smooth bilateral on the copy.
I made 3 copy the filtered layer.
The copy on top is for the contours ->contours->gradient norm, checked "negative colours". I coloured the contours with curves (usually I make them blue, this time I preferred a dark yellow). Layer on multiply, opacity near 50%.
The middle one ->testing -> Corvo's painting. XD. Layer mode normal, opacity near 50%.
The bottom copy -> contours, segmentation.
Merged the middle and bottom copies, played with curves on the merged layer (rgb curves and hsl).
Added a texture ->pattern -> canvas texture with a low amplitude.

I like that Corvo. It seems you have transformed the photo in a beautiful painting.

Yes, it is very interesting your outcome. I like it a lot.

I tried this image.

it looks very good, Wallace!
you didn't say using which filters, did you?

Hope you don't mind me cheating. Though I did a lot of G'MIC bilat smoothing for cleaning (also used Wavelet Denoise filter which is not G'MIC), I also used some other things (to darken the sky, I used Unplugged's Ink Rubber set to value; this is a filter factory filter which I used the User Filter for run). Also, selectively saturated the reds. Forgot to add that I also first dupped and ran Luma Invert filter set to overlay for a contrast mask.

OK; this time I mainly used G'MIC. lol

Used Fast Tone mapping then hyper saturated.

Welcome here Lyle!
Very interesting outcomes.
Should I assume you like my photos as a base for your experiments or ... is it just a case!? hehehe...

I do like your photos but also, I have no good photos of my own. lol