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image composed of dots

Jul 2, 2014, 14:04
Post: #1
image composed of dots
Is there a way I can use GIMP to create an image composed of dots all of the same size? Thuss creating different shades by altering the density of the dots, not the size of the dots.

To clarify, in the attached pictures I've made an example using [Filters -> Distort -> Newsprint...]. With this option I can create different shades by altering the dot size keeping a set cell size. What I wan't is a function that can do the opposite, vreate an image whit set dot size and variable cell size.


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Jul 2, 2014, 14:21
Post: #2
RE: image composed of dots
(Jul 2, 2014 14:04)yipman Wrote:  What I wan't is a function that can do the opposite, vreate an image whit set dot size and variable cell size.

Look for a plugin for dithering,
   
This is the filter from G'mic but from memory there are others.

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Jul 2, 2014, 14:34
Post: #3
RE: image composed of dots
Thanks alot!
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Jul 2, 2014, 21:26 (This post was last modified: Jul 2, 2014 21:37 by Esper.)
Post: #4
RE: image composed of dots
its called halftones

you can get the effect with G'MIC -> Patterns -> Op Art

   

and you can also do this in Inkscape, but it is very processor heavy

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Jul 3, 2014, 05:26 (This post was last modified: Jul 3, 2014 05:26 by iForStyle007.)
Post: #5
RE: image composed of dots
Another option using Gimp built-in default stuff:
(mainly HSV noise & Threshold)
*Steps in order from top to bottom of picture.
   
1. duplicate layer(for backup) Foregroundselect click foreground select tool
- left-click a loose selection around the object. (works best with solid backgrounds like this)
- connect your last point to the first.
2. You should now see a blue/colored overlay, left-click to paint a line or more over the object, let go of the click for it to auto mask it. Hold ctrl while clicking to erase bits you don't want in the selection mask.
- when done painting, push enter.
3. Go to:
Filters > Noise > HSV noise
- Pull any value to full as seen in the picture, customize the other sliders. Click OK
4. Next go to:
Colors > Threshold
- Adjust this to you're liking (increase or decrease the density)
it should look something like this ^_^
   
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Jul 3, 2014, 08:17
Post: #6
RE: image composed of dots
(Jul 2, 2014 21:26)Esper Wrote:  its called halftones
..snip..

Halftoning is what the OP does not want

Quote:..I can create different shades by altering the dot size keeping a set cell size. What I wan't is a function that can do the opposite, vreate an image whit set dot size and variable cell size...

There is an earlier post on the subject http://gimpforums.com/thread-oldstyle-ha...-dithering

I had a look through my archives last night and the plugins I remember, are old PS .8BF that might/might-not work with PSPI or xnview, also an old RobA script.

In Gimp; back to G'mic and Black & White -> dithering

Otherwise a better bet is ImageMagick and the -ordered-dither option
   

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