Archive for the ‘Gimp video tutorial’ Category
December 18th, 2009 by Rolf
Download the Video! (61.2 MB, 32:10)
Download the Torrent!
Download the Companion File! (767 Bytes!)
Sorry, again a “Nerd Show”. I tackle some problems that have come up with the Python script of the last week and show my way to debug and test while making errors. My first error was to take a test case without colours – my script from last week changed all images to greyscale. Then I learn something useful about merging layers in Python.
But the top of the show is even more nerdy – the Octave plugin allows to access the Octave math software from GIMP. Caluculate your images or do a FFT with them.
The scripters crowd in the forum found a bug in GIMP, saulgoode reported it and it got fixed in a day. Take that, Adobe! 
Then I try to explain why the big blobs in the image featured two shows ago are not made with GIMP but with pure physics in the camera. You can see a Blender video I made about this for #200 of Chris Marquards Tips from the Top Floor show. My part starts at about 11:40 and contains an embarrassing error. Do you get it?
This image by Nachbarnebenan is a good example for a shallow DoF.
The next show will be a simple, non-nerd walk through the post processing of an image. Promised.
The TOC
01:10 Octave Math Plugin
02:10 Number types in Python
06:00 Making a test case
06:30 Finding the wrong layer mode
08:00 Running into a wall and thinking around it
09:40 Isolate the bug
12:40 Cleaning up the code
14:40 Colour halos wit Normal Mode sharpening
16:40 When to use Octave sharpening
17:10 Basics of Photography – Depth of Field and Bokeh
19:00 Image creation with a lens
21:00 Circle of Confusion
22:30 Depth of Field
25:00 Apperture and DoF
28:30 DoF and sensor size
29:00 Dofmaster
30:00 Focal length and DoF
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.
Tags: Depth of Field, DoF, Programming, python
Posted in Gimp, Gimp video tutorial, Programming | 33 Comments »
December 12th, 2009 by Rolf
Download the Video! (77.0 MB, 40:31)
Download the Torrent!
Download the Companion File!
This is the second time I try to get into Python scripting for GIMP. My script in the first show about scripting was simple, just saving some clicks. Now it is more complicated, variables, loops and floating points included. But no parrots!
You find a better version of the programs in the companion file. Following a tip in our Forum I included a Undo Group. So the action can be undone, a behaviour that should have been included from the start.
I mentioned some sources. Instant Python, the official Python Tutorial and the GIMP Python reference. Bert has a script page and a much better version of the Octave sharpening script.
Then we have a UnGIMP composition challenge on the Forum.
Have I forgotten some promised links? Please complain below!
Errata:
The loop counter in the companion file is set to 6 instead of 4. You can change it back or leave it.
Perhaps it is better to take the image size from drw instead of img. See the discussion in the forum. drw.height and drw.width should work also when the layer is smaller than the image.
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.
Tags: octave sharpening, Programming, python, script, sharpening
Posted in Gimp, Gimp video tutorial, Programming | 37 Comments »
December 5th, 2009 by Rolf
Download the Video! (32.7 MB, 17:13)
Download the Torrent! (working!)
If you have problems with the sound – simply reload! There was a glitch.
I was out on a photo walk with a GIMPer from Bremen. One of these shots is post processed in this show. Nothing special, just adjusting the colours with a curve in two different parts of the image. Of course a layer with mask is used to separate the different areas and explained again for the new GIMP users.
The really new information is about uploading images from F-SPOT to 23 and flickr. You have to enable the exporter in the menu Edit/Mange Extensions/Export. 23 is covered by the flickr exporter, they use the same API.
You can find the final image on 23 and flickr, both uploads worked like a charm.
You can participate in episode planning in the Wave. It is open for everybody.
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.
Tags: beginner, F-Spot, layer, layer mask, upload
Posted in Gimp, Gimp video tutorial | 9 Comments »
November 12th, 2009 by Rolf
Download the Video! (22.6 MB, 11:53)
Download the Torrent!
Sorry – no mobile version yet!
A short one this time – I upgraded to Karmic Koala and did a clean install with new partitions and EXT4 file system. And now I am getting the important stuff back on the disk and leave the cruft out. This meant that a lot of the files needed for a proper podcast are still on the external disks.
I take a look a the new Folio by Jeff Curto at Lenswork – because it’s an example of printing an image on paper with a different aspect ratio, the images are really good and Jeff is a friend and I hope he sells a lot of them. Jeff does two podcasts in the Photocast Network, Camera Position and The History of Photography. The last is the only podcast where I have experienced a coffee break.
I use an image from “wbool63″ from the forum to make some nice frames with G’MIC, the Swiss Knife plugin from France.
And I have done….
The TOC
00:20 Greetings and Jeff Curto at lenswork
02:30 Using a white frame and text
03:10 Cropping an image
05:50 Getting a square crop
06:20 Eyes out of focus – no problem here
07:10 G’MIC plugin and frames
No blackboard this time – and no mobile version yet. The upgrade broke the toolchain, I have to compile ffmpeg to get it running again. Software patents are really …….
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.
Tags: cropping, G'MIC
Posted in Friends, Gimp, Gimp video tutorial | 6 Comments »
October 24th, 2009 by Rolf
Download the Video! (53.7 MB, 28:14)
Download the Video for iPods etc (24.1 MB, 28:14)
Download the Torrent! (likely broken)
There are a lot of tutorials out there for “The Other Program”, also called Adobe(R) Photoshop(R). (I hope I got the Rs right, can’t find the page where Adobe(R) told the world how to call this program.) A lot of that stuff is easily translated to GIMP, but there are some serious differences. One are the “Adjustment(R) Layers(R)”. This is a way of applying a curve, gradient, hue or saturation change….. without changing the real image. You can come back later and tweak the curve or the slider – non destructive editing.
There is an easy way to work around this: make a new layer of the visible image and work on that. You have to redo that, if you decide to change something in the lower layers.
To show how to do this I have ripped out a part of John Arnold’s Photowalkthrough podcast and redone the same in GIMP. Photowalktrough is a really good resource for everybody who is into the digital darkroom – independent from the program used. And John has his #100 out! Congratulations!
GIMP will have non destructive editing in a year or two – it’s the main reason for getting GEGL into GIMP and making this big effort of writing a lot of the program again.
In the second part of the show I get the blackboard out and start a new segment in the show. I try to explain how film and sensors are working. I’ll expose you to some of these lessons for about 5 to 190 minutes and will then decide upon your reaction if I should keep this on. I’ll have them at the end of the show – if you are bored you can just skip the rest.
Sorry, there is no TOC up to now. the moment Kevin made one. 
The TOC
00:28 Welcome to PhotoWalkThrough.com from John Arnold
01:05 Welcome to Meet The Gimp from Rolf
02:30 Back to John
02:50 – a curves layer
05:10 – a layer mask
08:20 Back to Rolf
09:00 The original photo
09:20 Make a layer with increased saturation
10:40 Add a gradient layer in soft light mode to alter the sky
12:10 New layer from visible
13:25 Add a layer mask and edit it
15:25 The problem with destructive editing
15:55 But it’s not that big a problem
18:20 New segment – time for lessons
19:55 How film works
24:00 How a sensor works
27:00 Feedback please
28:14 The End
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.
Posted in Gimp, Gimp video tutorial, Photography technical basics | 16 Comments »
October 15th, 2009 by Rolf
Download the Video! (58.1 MB, 30:32)
Download the Video for iPods etc (37.1 MB, 30:32)
Download the Torrent! (likely broken)
The results of the Book Challenge have been so interesting that I have made two shows out of them. This is the second part.
If you want to buy Akkana Peck’s book from amazon.com in the US, go to her website and use her link. She gets a bit more money out of it and you pay the same.
The TOC
00:50 Threshold tool revisited
02:40 Ityker’s image
04:00 Selective decolorisation
05:00 Layer mask for selective decolorisation
05:00 Layer mask shortcuts
06:00 Duotone
08:45 Sample points
10:00 Preventing tonal change of the colorisation layer
11:10 Sharpening layer
12:50 Fake view cam cassete shadow
14:30 Mathias’ image
15:50 Image sources
17:00 Layers for ressources
18:40 Combining different exposures
19:25 Healing spots and bra straps
20:30 Layers for sculpting the hair
22:40 The sky – overlay mode
23:50 The sign
24:00 Layer groups
25:00 Dodge and burn on a layer in soft light mode
26:00 Unsharp mask for enhancing local and global contrast
27:20 The John Arnold Style Vignette(R)
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.
Tags: challenge, layers
Posted in Gimp, Gimp video tutorial | 6 Comments »
October 9th, 2009 by Rolf
Download the Video! (48.0 MB, 25:16)
Download the Video for iPods etc (35.1 MB, 25:16)
Download the Torrent! (likely broken)
The results of the Book Challenge have been so interesting that I have made two shows out of them. This is the first part.
If you want to buy Akkana Peck’s book from amazon.com in the US, go to her website and use her link. She get’s a bit more money out of it and you pay the same.
It’s worth to keep an eye on John Arnold’s Photowalkthrough, perhaps something special is coming up there.
The TOC
03:30 Kevin’s image
04:00 Bracketing
05:30 Darkening parts of the image with curves and layer mask
06:30 Combining different images from the bracketed shots
09:00 image composition
10:00 Spray paint
10:10 Notes in a separate layer
12:00 jd24w9′s image
12:00 Combining background and foreground from different shots
12:50 Don’t merge your layers – keep them!
13:45 Better use a different shot for the sky – fake but easier
14:25 Ted’s image
14:40 Tab toggles the toolbox on and off the screen
15:00 Divide the image in several parts and process them differently
16:30 Overlay Mode for enhancing brickwork
17:15 Making a surreal sky with multiply mode
18:45 Gimpel’s image
20:00 Threshold tool for black and white
21:15 painting over the image
22:00 Wrapping up
22:35 Server problems and PCN
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.
Tags: challenge
Posted in Gimp, Gimp video tutorial | 4 Comments »
October 2nd, 2009 by Rolf
Download the Video! (56.3 MB, 29:50)
Download the Video for iPods etc (41.4 MB, 29:50)
Download the Torrent! (likely broken)
Download the Companion File!
I had not enough time this week to make a proper show about the results of my challenge. (Next week I’ll have no school! ) Instead I make the blog image for the next show in this one. You’ll see a bit about the transform tools (rotate, scale, sheer and perspective) which have picked up a transparency slider somewhere since the show I made about them. Very nice to have! I was pointed to that by Jan Kardel’s video.
If you want to make an incredible amount of money it is a good idea to learn GIMP. Sergey Brin did that, created the logo of his startup and got rich. I downloaded the xcf and peeked under the hood. Just standard stuff – as you have seen by Philippe.
The TOC
03:00 Grabbing images from the web
04:30 Elipse select tool
05:00 Copy and paste between images
05:30 Shrink (scale) a layer
07:25 Blurring with a layer mask and the blend tool
09:45 Copy and paste between images
10:35 Don’t work on the layer mask
11:25 Move the layer
11:55 Scale the layer
14:10 Rotate the layer
15:30 Revealing parts of a layer with a mask
17:30 Cropping to a square
18:20 Scale the image
18:40 Exporting to png
19:45 The GOOGLE logo in GIMP
22:10 Analysis
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.
Tags: transform tools
Posted in Gimp, Gimp video tutorial | 12 Comments »
September 25th, 2009 by Rolf
Download the Video! (100.0 MB, 52:38)
Download the Video for iPods etc (61.9 MB, 52:38)
Download the Torrent! (likely broken)
Download the Companion File!
This week you’ll get both hosts of the show in one package. Philippe (southern France) and I (northern Germany) discuss the results of the Double Book Challenge in the “From Scratch” section. We use Skype and the connection is not as good as we were used to it between Chile and Germany. So expect some funny noises added to the accents.
At the end of the show we both come up with a random number and calculate in a highly scientific way who wins the two books. I’ll give you all a chance to find out in the video if you have won and contact the winners later next week. And IF YOU have won, send me your contact data so that I can forward them to APRESS, who sponsor the prizes.
All the images we talked about are in the companion file.
Tags: challenge, gimp book
Posted in Gimp, Gimp video tutorial, meetthegimp | 15 Comments »
September 18th, 2009 by Rolf
Download the HD-Video! (18.7 MB, 9:52)
Download the Video for iPods etc (18.0 MB, 9:52)
Download the Torrent! (most likely broken…)
This is a short show about how to extract the colours out of an image and put them into a palette. The next version of GIMP will allow the export of the palettes in a lot of designer and programmer friendly ways.
There is a sound problem with this video. I had massive clicking in the sound file. I got a fair amount of it removed, but now I sound like I had recorded it in an empty trash can.
David Gowers made some very good comments about this show below. I pull them up here:
“That ‘new color from FG’ button you use is good for something (i’m not sure what). However I have to say, in the context in which you were using it, it would have been more appropriate IMO to use the ‘add to palette’ option of the eyedropper (then you just click with the eyedropper once to add a color to the active palette. If you have selected a color in the palette, the new color will get added to the right of that color (and will become the new active color).
Dragging rather than clicking will update the color as you move the cursor, and you can release the mouse button when you are happy with the color you have (which will be the one now stored in the palette).
AFAIK, the reason you cannot edit the color name is because you have not selected a palette entry by clicking on it.”
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.
Tags: palette
Posted in Gimp, Gimp video tutorial | 8 Comments »
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