Using ImageMagick

[r57shell]

I don't know, why there is no such topic. So, I will be one who start it.
Note: \ in the end of line, means to continue line

Quantization and Color reducing
Anyway, for one who interested in imagemagick way:

First, to generate Genesis Colors, according to this:
Put in file genesis_colormap.txt such info:

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# ImageMagick pixel enumeration: 8,1,255,Gray
0,0: (0,0,0)  
1,0: (9,9,9)  
2,0: (16,16,16)  
3,0: (22,22,22)  
4,0: (27,27,27)  
5,0: (32,32,32)  
6,0: (38,38,38)  
7,0: (47,47,47)

Next, build Color map

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convert -size 32x16 xc: \
   -channel R genesis_colormap.txt -fx "v.p{i&7,0}/47*255" \
   -channel G genesis_colormap.txt -fx "v.p{j&7,0}/47*255" \
   -channel B genesis_colormap.txt -fx "v.p{(i>>3)|((j>>3)<<2),0}/47*255" \
   -scale 600%% -filter point genesis_colormap.png

And after it, if you want to translate image into Genesis Colors:

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convert my_img.png -dither Riemersma -remap genesis_colormap.png my_img_gen.png

And if you want to reduce colors:

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convert my_img.png -dither Riemersma -colors 15 +dither -remap genesis_colormap.png my_img_15.png

Original, Genesis colors, Genesis 15 colors, Genesis 30 colors:


Almost all settings:

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сonvert my_img.png -colorspace <colorspace> -quantize <colorspace> -dither <dither> -colors <number> +dither -remap genesis_colormap.png my_img_gen.png

Colorspaces: RGB, YCrCb, YUV, Lab, HSL, and many others...
Dither: Riemersma, FloydSteinberg, None.

Two pass:

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сonvert my_img.png -colorspace <colorspace> -quantize <quantize> +dither -colors <number> -unique-colors _tmp_map.png
сonvert my_img.png -quantize <quantize> -dither <dither> -remap _tmp_map.png my_img_gen.png

I don't know why, but two pass method gives another result.
If someone knows how to set dither strength, then please, let me know too.

Random Maps Generation
This is something, that I tested some months ago.
Example result:


I have done it with command:

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convert -size 1000x1000 plasma:gray50-gray50 -blur 0x2 \
                 -channel G -auto-level +channel -set colorspace sRGB \
                 tiles.gif -virtual-pixel tile  -fx "u[floor(7.999*u.g)+1]" \
                 map.png

tiles.gif:


How does this work:
1) ImageMagick generates fractal "plasma": http://en.wikipedia.org/wiki/Diamond-square_algorithm
2) Next, gray channel maps into several levels (7 in this example).
3) Each level will correspond to certain layer (dirt, sand, spice...)

Result of this program obviously rough. But, with making some improvements, and may be pre/post processing, you can get good results.

One more example:

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convert -rotate 45 -size 1415x1415 -seed 12 plasma:gray50-gray50 -blur 0x2 \
                 -channel G -auto-level +channel -set colorspace sRGB \
                 -crop 1000x1000+207+207 -fx 'floor(8.7*u.g)/8'  map1.png
convert -rotate 45 -size 1415x1415 -seed 12 plasma:gray50-gray50 -blur 0x2 \  
                 -channel G -auto-level +channel -set colorspace sRGB \
                 -crop 1000x1000+207+207 \
                 tiles.gif -virtual-pixel tile -fx 'u[floor(8.7*u.g)+1]'  map2.png

Grayscale - layers map, and resulting map.

[r57shell]

Finding common palette
Just combine all images into one.
http://www.toptenz.net/wp-content/uploa ... acters.png

You can make it in any editor, or use ImageMagick.

Stack images vertical:

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convert img1.png img2.png img3.png ... img_n.png -append out.png

Or stack images horizontal:

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convert img1.png img2.png img3.png ... img_n.png +append out.png

Or make matrix with three columns from images:

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convert \
 ( img1.png img2.png img3.png +append) \
 ( img4.png img5.png img6.png +append) \ 
 ( img7.png img8.png img9.png +append) \
 ... \
 -append out.png

And then, after you combine all images into one, just reduce colors.

And get colors:

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convert mortalkombat_16.png -format
 %c histogram:info:-

It's output:

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    302593: (  0,  0,  0) #000000 black
    234819: ( 49, 49, 49) #313131 srgb(49,49,49)
     80894: ( 49, 49, 87) #313157 srgb(49,49,87)
     88098: ( 87, 49, 49) #573131 srgb(87,49,49)
     88066: ( 87, 87, 49) #575731 srgb(87,87,49)
     60004: ( 87, 87, 87) #575757 grey34
     42590: ( 87, 87,174) #5757AE srgb(87,87,174)
     31732: ( 87,146,174) #5792AE srgb(87,146,174)
     32211: (119,119,119) #777777 srgb(119,119,119)
     54173: (146,119, 87) #927757 srgb(146,119,87)
     67456: (174, 87, 49) #AE5731 srgb(174,87,49)
     52573: (174,146,146) #AE9292 srgb(174,146,146)
     76458: (206,146, 87) #CE9257 srgb(206,146,87)
     57355: (206,206,174) #CECEAE srgb(206,206,174)
     41698: (255,255,206) #FFFFCE srgb(255,255,206)

Or get colors image:

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convert mortalkombat_16.png -unique-colors -filter Point -scale 1600% mortalkombat_16_colors.png

Some two colors was remapped into one, so on this image to get 16 colors, I will need to set "-colors" parameter to 17.

[Chilly Willy]

Great posts... some of us use imagemagick and don't think about it, but others could use hints on doing stuff we take for granted. I use imagemagick all the time, but never thought to start a thread on it.

[bastien]

hi ,
First thanks for this tuto , i want to use this way now
but when i write this code :

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convert -size 32x16 xc: \
   -channel R genesis_colormap.txt -fx "v.p{i&7,0}/47*255" \
   -channel G genesis_colormap.txt -fx "v.p{j&7,0}/47*255" \
   -channel B genesis_colormap.txt -fx "v.p{(i>>3)|((j>>3)<<2),0}/47*255" \
   -scale 600%% -filter point genesis_colormap.png

it will send me this error :

convert.exe no encode delegate for this image format ...
i sue the lastest version : ImageMagick-6.0.2-Q16

[r57shell]

Latest version: ImageMagick-6.8.5
I use: ImageMagick-6.8.3
Note: \ in end of line, means Continue line!
I will add this note in beginning

You can skip this step, just download resulting image.

[bastien]

Thnaks you very much !
Now it works very well

[bastien]

did you have a way for convert an image into 30 color mode but with 8*8 tiles use only one palette?
Because with this way the palette are mixed into one tiles.

[r57shell]

did you have a way for convert an image into 30 color mode but with 8*8 tiles use only one palette?

It is very complicated problem, and very specific. I don't know "best" way.
But you can:
1) Find 30 colors palette
2) Split 30 colors into two palette depending on your things
3) Map image into each palette independent.
4) Mix by tile. I mean, select tile yourself.
But even splitting 30 colors into two palette has n! / ((n - m)! * m!) = 155117520 variants .
See this topic, for some another tools.

[frederic]

did you have a way for convert an image into 30 color mode but with 8*8 tiles use only one palette?
Because with this way the palette are mixed into one tiles.

I made a Perl script that does that. The script tries to optimize the palettes so that the image is not altered too much. See this post: viewtopic.php?p=20127#20127.

[r57shell]

ImageMagick for ActiveState Perl

How to make ImageMagick work with Perl.

For Unix: http://www.imagemagick.org/script/perl-magick.php

For Windows:
1) Download ImageMagick with suffix "-dll.exe" installer. Remember x68 or x64.
2) Install with options: install for ActiveState Perl and remember version.
3) Download ActiveState Perl version needed for ImageMagick.
4) Open "cmd.exe" (WIN+R "cmd.exe")
5) Write "ppm install <path to ImageMagick\PerlMagick\Image-Magick.ppd>" without <>, and press Enter.
This Will show: "Installing package 'Image-Magick.ppd'..."
Installation process done.
Test: goto into ImageMagick\PerlMagick\demo directory, and run any script

[Ti_]

Test: goto into ImageMagick\PerlMagick\demo directory, and run any script

This will not help me.
I use trick CORE_DB_magick_.dll renamed to CORE_RL_magick_.dll ;
after that I copied other 5 dlls he wanted to directory with script.

Now it wants cluster. script.
I use other trick: I take it from Cluster.pm and copy it to perl folder, with create other folder called "Algorithm".
But after that it wants other file - I tried to use dll from installed cluster.dll for win. But that dll doesn't work.

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Can't find 'boot_Algorithm__Cluster' symbol in ./Cluster.dll

I've also tried to use what readme says:

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  ppm install http://bonsai.ims.u-tokyo.ac.jp/~mdehoon/software/cluster/Algorithm-Cluster.ppd

and....

ppm install failed: The PPD does not provide code to install for this platform

All soft that wants dll should burn in hell...

[r57shell]

3) Download ActiveState Perl version needed for ImageMagick.

This is your problem.

[Ti_]

3) Download ActiveState Perl version needed for ImageMagick.

This is your problem.

Can you write which versions of Perl and Magick works with together?

[r57shell]

I don't know it.

2) Install with options: install for ActiveState Perl and remember version.

[Ti_]

I don't know it.

2) Install with options: install for ActiveState Perl and remember version.

I tried this order (firstly unistalled all), and it show me version 5.16.3 - that was same version that I have.

So, nothing changed - error msg with DLL.

And I aslo tried scripts from folder. (I used trick to get it work with dll again) - what should they do? some doesn't work, some do nothing or print errors, maybe because of wrong DLL.

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Exception 435: unable to open image `black': No such file or directory @ error/b
lob.c/OpenBlob/2644 at demo.pl line 14.