June 30th, 2009 by Rolf (6 Comments)
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Paths are a powerful tool in GIMP – and not so easy to understand. So I’ll make a two part series out of them.
Paths are Bezier curves and are controlled by anchor points and handles.With enough time and determination you can give them any form you want. A path can be generated with the path tool, from a selection and from a text in GIMP. And it can be stored and even exported as a SVG file.
So they do fit more into a vector based program like Inkscape. If you use them for drawing something, ask yourself if you are using the right tool.
Gimp has a good documentation about path basics , the paths tool, the dialog and the paths menu.
The last part of the video is edited in a hurry – you’ll notice some blunders.
The TOC
01:10 Path concept
03:05 Adding the Path dialog in GIMP
04:20 Adding a path with the Path tool
05:50 The Paths dialog
06:40 Turn a path into a selection
07:20 Stroke the path
07:50 Path context menue
08:40 Turn a selection into a path
09:40 Turn a text into a path and back
11:50 Put a text on a path
14:30 Don’t use GIMP for vector graphics
15:00 Wrapping up
Meet the GIMP Video Podcast by Rolf Steinort and Philippe Demartin is licensed under a Creative Commons Attribution-Share Alike 3.0 Germany License.
Permissions beyond the scope of this license may be available at http://meetthegimp.org.
June 26th, 2009 by Rolf (2 Comments)
June 23rd, 2009 by Rolf (5 Comments)
… too much work to be done up to tomorrow. But Thursday one will be out.
June 16th, 2009 by Rolf (13 Comments)
Podcast Video (23.3MB) [26:00m]:
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It’s toning time again. Toning is done do black and white images to increase their “volume”, the perceived contrast range. We only have 256 values on the screen, so a bit of colour can be good.
In #39 I had shown how to make a Duotone or Tritone out of a monochrome image. And then Paul Wellner Bou showed in his Blog an easier way to do this.
It’s working, but why? To answer that, I look into the HSV colour model and try to explain the effects of the different layer modes.
A little bit about sharpening in an extra layer with “value” as the mode and a pointer to faking analog camera frames in digital images with a script and an original Hasselblad frame made by Marcus Ranum are at the end of the episode.
The TOC
01:00 Toning images
02:00 Toning enhances the visual volume
03:50 The recipe for a duotone
04:30 Adding a layer in colour mode and adding a layer mask from an image copy
07:00 Doing the same for the second tone
08:00 Inverting the mask
09:20 Switching layers on and off
10:30 Sharpening in Value mode
12:20 Unsharp mask
15:10 Explanation of Colour and Value mode
17:10 HSV colour model
20:00 A fake view camera frame
22:20 Multiply mode
23:40 A real Hasselblad frame
Meet the GIMP Video Podcast by Rolf Steinort and Philippe Demartin is licensed under a Creative Commons Attribution-Share Alike 3.0 Germany License.
Permissions beyond the scope of this license may be available at http://meetthegimp.org.
June 9th, 2009 by Rolf (6 Comments)
June 3rd, 2009 by Rolf (1 Comment)
Joel dicusses “c2g“, a GEGL function new in GIMP 2.6.
“The idea behind c2g is to convert each pixel to B&W using an optimal white balance: the black and white points are calculated for each pixel according to its surrounding, giving the closer pixels more weight (and following a gaussian curve). And basically this mimics the way our human eye perceives the image – how we perceive a color (or grey nuance) depends not only on its value, but on its environment.”
Interesting stuff – and controversly discussed in the comments to that post. Check them out too!
June 2nd, 2009 by Rolf (22 Comments)
Podcast Video (61.7MB) [45:26m]:
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This weeks show starts with some additional talk about tablets. After Episode 101 there still was the question if a Wacom Bamboo tablet is “good enough”. Matthias visited me with his tablet and we sat in a street cafe and compared. (Sorry, the sound in this segment is not very good and out of sync.) The Bamboo is as good as the Intuos if you don’t need diffenrent pens. I would buy one. (Too bad that I don’t get money from W….)
Then I follow a comment from Steinar and explore the Device Status dialog. It gives you all information you need about your row of input devices. Even if they are plugged in too late. 
In the image I tackled last week were some really big damages. And I tried to fix them with the Resynthesis plugin and G’MIC. Both did well with small defects and considerably good with the big ones. The were only at loss where knowledge about the world was needed – like in the back of the chair. We know that the wood goes on – the computer does not.Perhaps the result would have been better with the first plugin if I had followed Tobias’ tip thouroughly.
UPDATE: If you call the Resynthesis plugin via Filters/Enhance/Smart remove selection you get a much better result. See in the image on the right.
Both plugins are not easy to use and need ore time to explore than I was motivated to invest.I found no way to “automagically” select the damged parts of the image. Perhaps a scan in full colour mode would have been better. Ther may be a colour difference between dirt and image that can be exploited for a selection. So, scan in RGB!
There is a an other plugin perhaps usable for such work. It’s the Wavelet decomposer. I’ll try that in a later show.
At the end of the show I tell you a bit more about this young man, show Norman’s version of the reconstructed image and propose a different approach with an oval “matte”, like it must have been in the original.
The TOC
00:30 Comparing the Wacom Bamboo with the Intuos
05:40 2 tablets, 1 machine
06:30 The “Device Status” dialog
13:30 Going back to the “Portrait of a Young Man”
14:00 Resyntesizer and Wavelet Decompose
16:15 G’MIC
17:30 Comparing G’MIC and Resynthesizer
18:00 Please scan in RGB even if the image is monochrome!
19:20 Take care with the eyes!
20:30 Preparing a mask for the plugins
24:40 Using a colour for the mask
28:30 The G’MIC plugin at work
32:40 Resynthesizer at work
34:40 Comparing the results
36:00 Conclusion
37:00 Who is in the image?
39:00 Norman’s version of the image
39:40 Making an oval frame
43:40 Good bye!
Meet the GIMP Video Podcast by Rolf Steinort and Philippe Demartin is licensed under a Creative Commons Attribution-Share Alike 3.0 Germany License.
Permissions beyond the scope of this license may be available at http://meetthegimp.org.
May 26th, 2009 by Rolf (11 Comments)
Podcast Video (26.9MB) [34:37m]:
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Again Norman has an interesting task for me – restoring old images. John Edwin Frewer was photographed in London around 1866/7 – of course not digital. I’ll tell you a bit more about him in the next episode.
His image was on a glass plate negative and was then copied as a contact print to photographic paper. The guys who took the image were a bit sloppy and left some lint and marks on the image. And then came 140 years of storage and handling.
Norman has offered to restore the images and I’ll try to help him with this and the next episode. In this one I revisit the clone tool and explore the heal tool. It’s the right tool for tackling all the spots in the image.
The show starts with greeting to Russia, A lot of visits to the site are from there and comments in Cyrillic are getting more. Google translate helps not a lot and so we are looking for some help from Russia. You speak Russian? Become an Editor for this blog and decide what’s real and what’s SPAM. And to all the Russian visitors here – please try to write in English, even if you think it’s not good enough. We will understand you better than Google translate – or ask.
Then I show a plugin that turns dull screenshots into nice reflecting 3-D product shot.
This plugin was written by Fabian A. Scherschel, the German part of the Linux Outlaws podcast. Fabian is drinking beer and talking with Dan Lynch (several cups of tea) about Linux, Open Source news, politics and more.
I think you’ll hear about a really good video podcast about GIMP there soon, so check them out.
The TOC
00:30 Greetings to Russia
02:48 Linuxoutlaws and screenshot plugin
08:25 Norman has a new problem
09:00 What’s wrong with this image from 1870?
14:10 How much to correct
15:10 Make a backup layer
15:30 Clone tool
17:30 Heal tool
22:10 Undo a whole area
23:20 Working on the face
25:30 Verschlimmbessern
26:50 Comparison of clone and heal tool
29:10 Keep the pattern of the suit
31:00 Tedious work ahead, but….
31:20 perhaps a G’MIC can help?
32:50 Wrap up
Meet the GIMP Video Podcast by Rolf Steinort and Philippe Demartin is licensed under a Creative Commons Attribution-Share Alike 3.0 Germany License.
Permissions beyond the scope of this license may be available at http://meetthegimp.org.
May 24th, 2009 by Rolf (10 Comments)
There is a lot to do until then, too much to get finished in the planned half year interval. So don’t hold your breath and enjoy 2.6.x. Behind the link are some examples of GEGL effects.
And consider to help in developing or donate to speed things up!
May 23rd, 2009 by Rolf (5 Comments)
A bit late, but finally here!
Philippe was working on bank notes – but it turned out to be a too big task for the available time. The designers of these notes have one thing on top of their minds – make it difficult to copy.
Do you remember the show about 
