G'MIC Droste.

2-ton · **Posted:** Thu Jun 14, 2012 3:39 pm **(#41)**

What checkbox? I'll post a screen shot, you know, a picture is worth............

Erisian · **Posted:** Thu Jun 14, 2012 3:42 pm **(#42)**

The one marked Internet at the bottom of your list. You've already got it checked.

Draconian · **Posted:** Thu Jun 14, 2012 3:43 pm **(#43)**

All the way at the bottom next to the refresh arrows.

Erisian · **Posted:** Thu Jun 14, 2012 3:50 pm **(#44)**

2-Ton - have you ever used About/Additional filters?

2-ton · **Posted:** Thu Jun 14, 2012 7:47 pm **(#45)**

yes. I learned this from the gmic on my 2.6--I refresh, then go in and tic all the boxes, then refresh again, then go in and untick all the boxes, and refresh again. sometimes I also click apply. I know that is overkill but I figure that way I cover all bases.

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12516

2-ton is right; had to do this myself in the ol' 2.6 days so it works. Am lucky in 2.8 so far (all the externals worked with no problem).

PhotoComix · **Joined:** Apr 12, 2010 **Posts:** 5870

Not sure if better post here or open a new topic on the flickr group....

I was thinking from long to ask if was possible port a droste effect to gmic, and i was wondering if would be possible port other type of mapping

To make the question more clear, i may easily found the formula for the various mapping but if i remember well for mathmap was needed to have the inverse formula and how get it for me was a enigma

And in gmic ?

1 ) supposing i get the mapping formulas (easy to find googling )..hem ...how to convert in a gmic filter ?
2) for most i found interesting i have a MathMap code, will be useful ?

A practical example (i have also a animated version but i fear would be more complex ) this map rectangles to ellipsoid but with a peculiar distortion that make the ellipsoid look more 3D ...

as here

What if Dali was Cristhian? by PhotoComiX, on Flickr

a before/after

BEFORE

varanasi, india by babasteve, on Flickr
AFTER (the left half mirrored horizontally + rectangle2ellipsoid )

Floating Egg Project by PhotoComiX, on Flickr

IF the input image ration is 1:1 ,if is a square, then the result looks is a sort of spherical mapping

here the MM code

Code: Select all

filter rel2ellv3(image in)
xprime=x/sqrt(1-4*(y/H)*(y/H));
yprime=y/sqrt(1-4*(x/W)*(x/W));
in(xy:[xprime,yprime])
end 

PS

Talking about Escher here a MM filter for a "Escher Balcony " mapping

Maurits Cornelius Escher - Balcony by mavrikha, on Flickr

Code: Select all

filter Balkon (image in, float rmax:0-1 (0.5),float p1:0-100 (40),float p2:0-20 (5),float p3:0-10 (5.5), float p4:0-10 (1.57))
# Searching Escher's Balkon transform

r1=r/H;
rprime=r1;
aprime=a;
if(r1<rmax) then
rprime=-(-p2+sqrt(p2+p1/2-p1*r1))/p3*cos(p4*r1)
end;
in(ra:[rprime*H,aprime])
end

not as easy to use as the rect2ell but still a quite interesting effect

Alonte · **Joined:** Jun 04, 2011 **Posts:** 254

cool how do i get it?

Rod · **Joined:** May 16, 2010 **Posts:** 14709 **Location:** USA

Alonte wrote:

cool how do i get it?

You have to copy those 2 codes to 2 separate files.
Name them whatever you want but make sure both have the mm extension.
Now place those 2 files in the mathmap > expressions > and pick a folder. I placed mine in map.

PhotoComix · **Joined:** Apr 12, 2010 **Posts:** 5870

Rod wrote:

Alonte wrote:

cool how do i get it?

You have to copy those 2 codes to 2 separate files.
Name them whatever you want but make sure both have the mm extension.
Now place those 2 files in the mathmap > expressions > and pick a folder. I placed mine in map.

i posted hoping they could be translated for gmic

As for mathmap all that codes are included in the build i hosting ,but if you use another here a nice animated version of rectangle to ellipsoid

Code: Select all

filter anim_rect2ell(image in)
xprime=x/sqrt(1-4*(y/H)*(y/H));
yprime=y/sqrt(1-4*(x/W)*(x/W));
in(xy:[x+t*(xprime-x),y+t*(yprime-y)])
end

2-ton · **Posted:** Sat Jun 16, 2012 11:07 pm **(#51)**

well I am still hoping that Droste will magically appear in my Arrays and Frames, lol.

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12516

What version of g'mic do you have 2-ton? Droste will only show up if you have version 1.5.1.5 period (which is the latest full release).

2-ton · **Posted:** Sun Jun 17, 2012 8:45 am **(#53)**

I have whatever version comes with Partha's McGimp download.
I think it is 1.5.1.4, at least that is what is highlighted in the about section of my gmic

Erisian · **Posted:** Sun Jun 17, 2012 8:47 am **(#54)**

Get the latest from http://sourceforge.net/projects/gmic/files/

2-ton · **Posted:** Sun Jun 17, 2012 8:55 am **(#55)**

I am running on a mac, and forgot how to put in a new gmic. I did it on 2.6 but that was a while ago. Also don't know if macs need their own version because the last two gimps I downloaded, Partha had them already included.
*stashed the 1515 mac version on my desktop for now...until I find out how and where to put it.

Erisian · **Posted:** Sun Jun 17, 2012 8:57 am **(#56)**

Mac versions are available at the link I gave. You'll need somebody else's help with installing as I've never used a Mac.

2-ton · **Posted:** Sun Jun 17, 2012 9:00 am **(#57)**

I did find my version...now to wait for some sympathetic person to tell me how to upgrade gmic. Since it's built in to my mcgimp, I am not sure it that makes a difference.

Erisian · **Posted:** Sun Jun 17, 2012 9:05 am **(#58)**

It probably makes no difference as it's packaged with Gimp and not built into it. If it's anything like Windows, you probably have a user plugin folder and it will just be a case of removing the old one and replacing it.

molly · **Joined:** Apr 07, 2010 **Posts:** 14182

viewtopic.php?f=23&t=1706
akky's instructions on how to install GMIC in Mac.

2-ton · **Posted:** Sun Jun 17, 2012 9:15 am **(#60)**

Thanks Molly, will go look.
It is not in my users plug in folder, nor listed as a separate folder. If it's there, it's tucked away where I can't find it. And if I put another one in the plug in folder, I might end up with two gmics and ruin them both! I will have to do some research!

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