Episode 173: Lots of Dots

Download the Video! (14:10 26.9MB)

Meet the GIMP is on Youtube! Mike AKA Eppic has started this channel and is uploading all the old episodes. Thank You!

I need some dot patterns for a project with Moiré. And so this episode is deveted to building dot patterns out of a grid without grid lines. Misterious? Have a look at the video!

The video ends a bit abrupt. Cinelerra went on strike with the last part of the footage. So some stuff is left as an exercise for you!

The TOC

00:20 We are on YouTube!
01:00 The Importance of Dots
02:00 The Grid filter makes crosses
03:00 Blurr and Threshold to make circles
04:25 Colour to Alpha – making white transparent
04:55 Patterns for the Bucket Fill
05:50 Measurements in the pattern
06:25 Cropping
07:00 Saving as .pat
08:45 Cropping again – same but different
10:00 Moiree demo
11:00 Getting smaller dots
11:15 No Threshold Tool on transparency
11:20 Curves tool on Alpha Channel
13:30 Cinelerra on strike

Creative Commons License
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.

8 thoughts on “Episode 173: Lots of Dots

  1. One of the neat features of GIMP is that the contents of the Clipboard buffer can be select as your current pattern (or brush). This means that one does not have to export the pattern image to a .pat file (unless one wants a permanent copy). Just perform either an Edit->Cut or an Edit->Paste and then choose the first pattern in the pattern dialog (the first one is always the Clipboard).

    Also, one can fill a layer by dragging a pattern from the Patterns dialog (or from the Toolbox pattern widget if the Preferences have been set to show it) and dropping it on the image window. (Again, this also works for brushes, though for brushes a new layer is created.)

    Combining these two features, one can quickly fill an image with dots by the following steps:

    1) Drag one of the circle brushes onto your image window (this creates a new layer).
    2) Open “Layer->Boundary Size…” and increase the layer dimensions to match your “grid size” (you can optionally Center the layer if you wish).
    3) “Edit->Cut” (this deletes the layer but also copies it to the Clipboard).
    4) Drag your Clipboard pattern onto your image window.

    This is not to disparage the method shown in the video, merely to present an alternative approach.

  2. Interesting episode this time. How did you arrive at the variable size dots in the blog post image?

    Also, even though you had problems with cinelerra, I am interested in how you use it to make your HD videos. I have been trying with some HD footage and having problems even getting started. I know this is off topic for this post, but is there a forum thread where you discuss it? Or is there a cinelerra forum that you find useful?

    Thanks

    • Cinelerra has a steep learning curve. I read the manual and some tutorials on their site. There is not much additional material around.

      The mailing list is quite helpful and responsive.

      I have big problems at the moment with HD footage from my Panasonic DMC-TZ7. Video and sound are not in sync while editing. But after rendering all is fine. Nasty to edit, because the sound is off, you have to cut along the mouth movements and not along the voice.

      I ended up in speed learning OpenShot for the video for my class…..

      The podcast is a screen recording with the sound in a separate WAV file. Much easier to handle and not so bad if the sync is not perfect.

Anything to add from your side of the computer?