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 Post subject: Yet another mosaic method for mosaic: the tutorial.
PostPosted: Mon Feb 22, 2016 3:35 pm  (#1) 
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OK; this one's for Diego. You folks know I hate doing these. lolol

Step one: your target (picture of a Christmas cactus flower I took a few years back).

Attachment:
cactus_flower.jpg
cactus_flower.jpg [ 185.61 KiB | Viewed 3452 times ]


Step two: Run Isophotes:

Attachment:
isophotes.png
isophotes.png [ 96.61 KiB | Viewed 3452 times ]


Now run Mosaic Helper (not showing screen shot)

Now stroke the resulting path with a dot.


Attachments:
dot.png
dot.png [ 115.49 KiB | Viewed 3452 times ]

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 Post subject: Re: Yet another mosaic method for mosaic: the tutorial.
PostPosted: Mon Feb 22, 2016 3:38 pm  (#2) 
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Result of the stroke:

Attachment:
stroked_dots.png
stroked_dots.png [ 76.04 KiB | Viewed 3450 times ]


Threshold the dots (turns out you can do this; I didn't play with this when I tried when I first started rendering these as I should; tried to convert to 2-bit but that didn't work. Saving as PBM and then using the result does work, but apparently Threshold works too so this is the better way of doing this):

Attachment:
threshold.png
threshold.png [ 20.62 KiB | Viewed 3450 times ]


Once you do this, run Skeleton (quick):


Attachments:
skeleton.png
skeleton.png [ 116.56 KiB | Viewed 3450 times ]

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Lyle

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 Post subject: Re: Yet another mosaic method for mosaic: the tutorial.
PostPosted: Mon Feb 22, 2016 3:42 pm  (#3) 
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Now convert the result of your Isophotes to all black (dup, top layer set to darken and merge down):

Attachment:
isophotes_black.png
isophotes_black.png [ 57.94 KiB | Viewed 3449 times ]


Invert the Skeleton result and merge the Isophotes black to create the mask:

Attachment:
mask.png
mask.png [ 74 KiB | Viewed 3449 times ]


Now colorize the cells (mask on top; target on bottom):


Attachments:
colorize.png
colorize.png [ 164.96 KiB | Viewed 3449 times ]

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Lyle

Psalm 109:8

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 Post subject: Re: Yet another mosaic method for mosaic: the tutorial.
PostPosted: Mon Feb 22, 2016 3:53 pm  (#4) 
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OK; the result (resized and embellished; not going to do a tut on that). :)


Attachments:
cactus_flower.jpg
cactus_flower.jpg [ 915.91 KiB | Viewed 3428 times ]

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Lyle

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 Post subject: Re: Yet another mosaic method for mosaic: the tutorial.
PostPosted: Mon Feb 22, 2016 6:12 pm  (#5) 
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Lyle: cannot find Mosaic helper. Where do I find it?


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 Post subject: Re: Yet another mosaic method for mosaic: the tutorial.
PostPosted: Mon Feb 22, 2016 6:36 pm  (#6) 
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Check thread below, Pat. Rob posted it there (a few replies down). :)

viewtopic.php?f=9&t=2714

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Lyle

Psalm 109:8

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 Post subject: Re: Yet another mosaic method for mosaic: the tutorial.
PostPosted: Tue Feb 23, 2016 12:42 am  (#7) 
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thanks a lot Lyle, today I will try to repeat your steps and see what I can get !

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 Post subject: Re: Yet another mosaic method for mosaic: the tutorial.
PostPosted: Tue Feb 23, 2016 1:02 am  (#8) 
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Hope to see what you can come up with Diego. My bet is this can all be done withing G'MIC, but Rob's mosaic creator is just a great Script-fu for doing this. :)

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Lyle

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 Post subject: Re: Yet another mosaic method for mosaic: the tutorial.
PostPosted: Tue Feb 23, 2016 2:40 am  (#9) 
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I don't know.
My problem is arriving to the phase where all lines(paths) are converted to dots, i.e. arriving to have a layer which does only show "designing" dots. I'm terribly incompetent with paths.
Anyhow, I'll try again later.

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 Post subject: Re: Yet another mosaic method for mosaic: the tutorial.
PostPosted: Tue Feb 23, 2016 3:10 am  (#10) 
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Lyle, Thank you very much for this nice tutorial to get such a bright result. You make many people grow in knowledge and be thankful for that. :clap :tyspin
Here your tut in PDF. :) :bump


Attachments:
The Tutorial by Lyle.pdf [1.49 MiB]
Downloaded 220 times

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