Here's a method I came across. Works quite well for certain photos... http://blogs.linux.ie/xeer/2004/10/01/cartoonizing-photos-with-the-gimp/

Donncha.

Jad Madi wrote:

http://www.flickr.com/groups_topic.gne?id=30241

On 5/28/05, Jad Madi wrote:

any idea how to apply camera to comic book technique with gimp?

The more detail you provide in your question the better chance you have of getting exactly the answer you want. If you want an effect like that seen in the Rhino picture you need to learn about Halftones, which is very much retro comic book style as opposed to some of the other simplrer more straighforward Cartoon effects like:

Filters, Artistic,
Cartoon...

The wikipedia page isn't a bad place to start if you want to learn more about Halftones:
http://en.wikipedia.org/wiki/Halftone

There is also a plugin for the gimp that can achieve this effect but it was confusingly called "Newsprint". The Newsprint plugin failed to mention the term Halftone in the short description so even when I knew what I was looking for it still took me ages to actually find the gimp version.

http://bugzilla.gnome.org/show_bug.cgi?id=301201 Thanks to Michael Natter the next version of the gimp Plugin Browser has a more flexible search tool which will hopefully make things easier to find in future but I still think the Newsprint plugin could benefit from an overhaul/rename/improved documentation.

Here's an example from the RedHat Getting started guide which uses the Newsprint plugin
http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/step-guide/s1-images-gimp.html

Gimp User Manual, examples of Plugins including an example of Newsprint http://www.mhatt.aps.anl.gov/dohn/software/gimp/GUMC/#918427

A GUG tutorial that makes various text effects using the Newsprint plugin http://gug.sunsite.dk/tutorials/tomcat2/

Sincerely

Alan Horkan

Inkscape http://inkscape.org Open Clip Art http://OpenClipArt.org Dia http://gnome.org/projects/dia/

On Sun, 29 May 2005, Donncha O Caoimh wrote:

Date: Sun, 29 May 2005 00:04:34 +0100 From: Donncha O Caoimh
To: Jad Madi
Cc: gimp-user@lists.xcf.berkeley.edu Subject: Re: [Gimp-user] Camera to Comic Book

Here's a method I came across. Works quite well for certain photos... http://blogs.linux.ie/xeer/2004/10/01/cartoonizing-photos-with-the-gimp/

Donncha.

Jad Madi wrote:

http://www.flickr.com/groups_topic.gne?id=30241

On 5/28/05, Jad Madi wrote:

any idea how to apply camera to comic book technique with gimp?

I really like this technique!

Besides the mentioned Newsprint filter there's Gimp's own Filters/Artistic/Cartoon which can help a lot with the black parts. Edge detection on a desaturated version of the layer can also help with delineating the contours

The link that Jad Madi supplied also referenced the original Photoshop tutorial at
http://www.macmerc.com/sections.php?op=viewarticle&artid=209&page=1

Some of the methods that are used must be done differently in Gimp, but apart from that it's the same moves. Admittedly I can't get my attempts to turn out as nice as theirs.

1) The crosshatching technique in the dark areas is very essential to this. I'm sure real Gimp-wizzes can achieve spectacular results with the GIMPressionist or whatever but I'm a novice at that. .. New layer
.. Drag the pattern 'Stripes 48x48' onto the layer .. Filters/Map/Displace: In X and Y displace source menuboxes choose the original layer
.. Add layer mask to the layer which should be distorted now (right click on the layer in the layer menu .. Copy original layer (select layer, Ctrl+C) and paste to the mask (left click on mask, Ctrl-X, Ctrl-H) .. Apply Curves to the mask (Layer/Color/Curves). Set the curve to something like this: `\_ or ``|__

2) He often uses a combination of Photoshop's Threshold (for making something black-white) and a Diffuse filter which does anisotropic filtering. I can only guess what it does as I don't have Photoshop, but I think that Diffuse+anisotropic == Filters/Noise/Spread with a bit of antialiasing to soften up the hard threshold. You should get the same effect by copying the layer to a new image, double the size, applying Spread, downscaling with Cubic interpolation and copying back again. Anybody who knows a better technique?

3) His Filter/Artistic/Poster Edges is somewhat of a riddle to me, especially since he sets Edge Thickness and Edge Intensity to 0.

4) Then comes my biggest problem: He uses Filter/Artistic/Cutout which has it's closest sibling in Gimp's Image/Mode/Indexed (applyed to a copy of the layer - set dithering to None, not Floyd-Steinberg, and a low color count) or perhaps Layers/Colors/Posterize. HOWEVER this renders very noisy borders between color bands. How to simplify the borders is beyond me, unless one does a Filters/Blur/Gaussian Blur first, but is that good? Perhaps use Filters/Noise/Spread a bit to loosen up on the sharp color areas

5) He uses the original layer with blend-mode 'Color' for changing the colors of his posterized layer. I don't think that Gimp and Photoshop uses the same blend-scheme because he recommends changing both the saturation and lightness of the color-layer for cartoonish style. Nothing happens in Gimp when I change the layers saturation. But making a second layer with mode set to 'Saturate' does somewhat the same.

That's what I can think of right know..

Regards Centipede

On Sun, 2005-05-29 at 16:44 +0100, Alan Horkan wrote:

The more detail you provide in your question the better chance you have of getting exactly the answer you want. If you want an effect like that seen in the Rhino picture you need to learn about Halftones, which is very much retro comic book style as opposed to some of the other simplrer more straighforward Cartoon effects like:

Filters, Artistic,
Cartoon...

The wikipedia page isn't a bad place to start if you want to learn more about Halftones:
http://en.wikipedia.org/wiki/Halftone

There is also a plugin for the gimp that can achieve this effect but it was confusingly called "Newsprint". The Newsprint plugin failed to mention the term Halftone in the short description so even when I knew what I was looking for it still took me ages to actually find the gimp version.

http://bugzilla.gnome.org/show_bug.cgi?id=301201 Thanks to Michael Natter the next version of the gimp Plugin Browser has a more flexible search tool which will hopefully make things easier to find in future but I still think the Newsprint plugin could benefit from an overhaul/rename/improved documentation.

Here's an example from the RedHat Getting started guide which uses the Newsprint plugin
http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/step-guide/s1-images-gimp.html

Gimp User Manual, examples of Plugins including an example of Newsprint http://www.mhatt.aps.anl.gov/dohn/software/gimp/GUMC/#918427

A GUG tutorial that makes various text effects using the Newsprint plugin http://gug.sunsite.dk/tutorials/tomcat2/

Sincerely

Alan Horkan

Inkscape http://inkscape.org Open Clip Art http://OpenClipArt.org Dia http://gnome.org/projects/dia/

On Sun, 29 May 2005, Donncha O Caoimh wrote:

Date: Sun, 29 May 2005 00:04:34 +0100 From: Donncha O Caoimh
To: Jad Madi
Cc: gimp-user@lists.xcf.berkeley.edu Subject: Re: [Gimp-user] Camera to Comic Book

Here's a method I came across. Works quite well for certain photos... http://blogs.linux.ie/xeer/2004/10/01/cartoonizing-photos-with-the-gimp/

Donncha.

Jad Madi wrote:

http://www.flickr.com/groups_topic.gne?id=30241

On 5/28/05, Jad Madi wrote:

any idea how to apply camera to comic book technique with gimp?

For those interested, I have started to make a number of hatchings (or whatever you say in english). Hopefully they are a little bit prettier and more natural to use as fillings of dark areas than the clean stripes you get from wrapping pure lines. I'll add rotated versions too to be used as second layer for making crosshatches.

So far there are only two, but I have more in the drawer coming up.

They can be found at: http://artcamilla.dk/vaultage/cornucopia/gimp-patterns/ under the names hatch-XXX.
The reason I used .PAT files instead of just .JPG is that I could specify a more descriptive name than the name of the file. If these cartoon endeavours turn out okay, I might make a plug-in for it.

Regards, Centipede

1) The crosshatching technique in the dark areas is very essential to this. I'm sure real Gimp-wizzes can achieve spectacular results with the GIMPressionist or whatever but I'm a novice at that. .. New layer
.. Drag the pattern 'Stripes 48x48' onto the layer .. Filters/Map/Displace: In X and Y displace source menuboxes choose the original layer
.. Add layer mask to the layer which should be distorted now (right click on the layer in the layer menu .. Copy original layer (select layer, Ctrl+C) and paste to the mask (left click on mask, Ctrl-X, Ctrl-H) .. Apply Curves to the mask (Layer/Color/Curves). Set the curve to something like this: `\_ or ``|__