I created the filter with the intention of making it look and act just like the MATHMAP droste so that anyone that searches for a video or tutorial will think that the G'MIC version is exactly the same. This is how the MATHMAP one originally displays, so that's how it defaults.

Having said that, I take your point that the initial preview display should show something of what the filter will actually do. The question here is which effect to highlight.

Souphead.

Thanks for taking into account my point.
About your question my position is: any effect you consider "nice" and representative.
I'm not an expert of Droste effects, but the one discovered by Lyle after many attempts looks certainly nice. Maybe other ones are also nice, you know certainly deeply the effects.

Hello to all members.
Thank you for this wonderful effect.
I added an example.



Doron.

Glad you like that Diego and again, definitely appreciate that you ported it to G'MIC (whoops; sorry Souphead. Diego did the glass preset). Just wish G'MIC had the wrap feature that Mathmap has.

edit: Correction thanks to my feeble brain. lol

Here is the code for a quick copy paste into your faves file.


Thanks Lyle!

What exactly is the wrap doing? Is it saying that if the pixel value is out of bounds, it fetches a pixel from a virtual copy sitting next to it? If so, maybe the wrap and mirror fills are not too hard to implement. I'll think about that tomorrow.

Souphead.

First my apologies Souphead (corrected the recorded; lol). Not sure how Mathmap's Wrap and Mirror fills work; coder I'm not.

I will call it a 'seniors moment' albeit it lasted 2 days. But it has taken me that long to work out the Lyle parameters and use of Faves ... so now I can get some Continuous Droste images created



Thank you Lyle!

if you use an image similar to the one posted by Lyle and apply his preset, you get the spiral

input:


output:


edit: source has an object on transparent BG and with somehow contrasted parts

Yes, Thank you Lyle and Souphead and Ronounours for this interesting filter. I know how you feel OMG, I also had to work out where and how to add the preset to the faves. Got there eventually.

Appreciate the comments, but I'm just a user. Souphead and David deserve all the credit for creating this cool new toy (preset). I just have way too much on my hands currently. lol

My eyeball image.

Nice Rod. Here is my Droste Explosion put through again.

So, I've created a copy (in Testing/Souphead) called Testing Droste which implements the edge wrap, reflect and rotate. To be clearer, it's the options that appear on the Settings tab that come with all MATHMAP filters as below:



At the bottom of the test filter, I put an option to switch on and off anti-aliasing (on by default) and to pick one of "wrap", "reflect" or "rotate" for X and Y edges. I didn't implement the color pick option because I can't get it to work. If someone can show me how they work with Droste, I can implement it - maybe.

One thing to note is that sometimes the edge may be visible because of the anti-aliasing. In that case, switch the anti-aliasing off.

Here is a quick look:



The top left is the original output with Blank/Blank. As you can see, there is a load of black (out of range) space. The top right is with Reflect for the X edge and blank for the Y edge. The lower left is with blank for X edge and Reflect for Y edge and finally, the lower right is reflect for both.

You can also get some interesting effect by sending one through again. This one below is the X edge with reflect sent in with again to Droste with both X and Y edges with reflect:



Anyway, try it out and if nobody finds any problems, I'll update the "real" one in a few days.

Souphead.

Wrap feature appears to be working Souphead.

Nice Martin ! Do not hesitate to replace the version in the main tree if you see that everything is working smoothly.

Looking great to me! Thanks.

And wrapped.