Subject:
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Re: Grayscale Mosaics
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Newsgroups:
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lugnet.build.mosaic
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Date:
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Wed, 5 Jan 2005 14:56:08 GMT
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Viewed:
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6303 times
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To create my Level 42
mosaic I used the Floyd-Steinberg dithering algorythm:
This algorythm was
originally written to convert images to black & white (NO grayscale) to reduce
filesize. I used this very same algorythm in a 3-dimensional space: the
RGB-space (every colour has 0-255 Red, 0-255 Green, 0-255 Blue).
I decide which
colours I want to use in my mosaic, so if I only select white, black, and 3
shades of gray, my Level 42 mosaic might have looked like this (maybe I should
play more with contrast/brightness):
Left:
original / Middle: Floyd-Steinberg / Right: no dithering
Extra in my
program: because (IMO) too many pixels turn gray in other programs, I only turn
a pixel gray if it IS gray (e.g. if calculated distance in RGB-space <20 to
gray). If gray is the best matching colour, but if I actually expect the pixel
to turn into another colour, then I make it turn into that other colour.
I
haven’t tried a SNOT-mosaic because it requires too many tiles.
Maarten
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Message has 1 Reply:
 | | Re: Grayscale Mosaics
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| Maarten, My mosaics are more than just a dithering of the 5 grayscale lego colors. In MLCAD, using a dithering of the 5 colors, I create a palette of 9 colors that I feel tricks the eye into seeing more shades, and therefore a clearer image. Here's (...) (20 years ago, 8-Jan-05, to lugnet.build.mosaic, FTX)
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Message is in Reply To:
| | Grayscale Mosaics
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| A year ago I saw the large Mona Lisa LEGO mosaic in person. I really wanted to be able to create something like that... without printing out an image and creating a LEGO mosaic pixel for stud. I was just never satisfied with computer programs that (...) (20 years ago, 3-Jan-05, to lugnet.build.mosaic, FTX)
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