trace and asciiart

please add pbmtoascii function from imagemagick, as well as autotrace delegate for bitmap tracing

[jcupitt]

Hi @Berserk82, what platform are you using? Do you mean to the Windows binary, or to the toolkit menu?

I'm running Debian 8 and windows 10.
I mean the pbmtoascii command in imagemagick and the libautotrace delegate for imagemagick

https://rrt2x7.wordpress.com/2013/07/29/text-to-ascii-art-conversion-using-image-magick/
and
http://stackoverflow.com/questions/1132601/how-to-convert-a-jpeg-image-into-svg-format-using-imagemagick

[jcupitt]

I've got autotrace sort-of working as a nip2 menu item, but it's a bit wonky still, I think we'll need an addition to vips for it to work well.

Put this in a file called Autotrace.def in nip2's start directory:

// autotrace as a menu item
// make sure you have the "autotrace" command-line program installed

Autotrace_item = class  
    Menuaction "_Trace" "convert a bitmap to a SVG file" {
    action x = class
        _result {
        _vislevel = 3;

        despeckle = Scale "Despeckle level" 1 20 1;
        line = Scale "Line threshold" 1 20 1;

        command
            = "autotrace %s " ++ join_sep " " [ofmt, ofile, desp, lint]
        {
            ofmt = "-output-format svg";
            ofile = "-output-file %s";
            desp = "-despeckle-level " ++ print despeckle.value;
            lint = "-line-threshold " ++ print line.value;
        }

        _result 
            = Image output
        {   
            [output] = vips_call "system" 
                [command]
                [$in => [x.value],
                 $in_format => "%s.ppm",
                 $out => true,
                 $out_format => "%s.svg"
                ];
        }
    }
}

For a 200x200 pixel source image, I see 4 or 5 FPS as I drag the sliders around, which is rather impressive. I've only done controls for a couple of the autotrace options, but it would be easy to add more.

You'll need git master vips and nip2, unfortunately.

Thanks a lot. 

Inviato dal mio dispositivo Samsung

-------- Messaggio originale --------
Da: John Cupitt notifications@github.com
Data: 24/02/2016 11:06 (GMT+01:00)
A: jcupitt/nip2 nip2@noreply.github.com
Cc: berserk82 berserk82.ia@gmail.com
Oggetto: Re: [nip2] trace and asciiart (#55)

I've got autotrace sort-of working as a nip2 menu item, but it's a bit wonky still, I think we'll need an addition to vips for it to work well.

Put this in a file called Autotrace.def in nip2's start directory:

// autotrace as a menu item
// make sure you have the "autotrace" command-line program installed

Autotrace_item = class
Menuaction "_Trace" "convert a bitmap to a SVG file" {
action x = class
_result {
_vislevel = 3;

    despeckle = Scale "Despeckle level" 1 20 1;
    line = Scale "Line threshold" 1 20 1;

    command
        = "autotrace %s " ++ join_sep " " [ofmt, ofile, desp, lint]
    {
        ofmt = "-output-format svg";
        ofile = "-output-file %s";
        desp = "-despeckle-level " ++ print despeckle.value;
        lint = "-line-threshold " ++ print line.value;
    }

    _result 
        = Image output
    {   
        [output] = vips_call "system" 
            [command]
            [$in => [x.value],
             $in_format => "%s.ppm",
             $out => true,
             $out_format => "%s.svg"
            ];
    }
}

}

For a 200x200 pixel source image, I see 4 or 5 FPS as I drag the sliders around, which is rather impressive. I've only done controls for a couple of the autotrace options, but it would be easy to add more.

You'll need git master vips and nip2, unfortunately.

—
Reply to this email directly or view it on GitHub.

What about ASCII Art?

[jcupitt]

Here's a slightly better Autotrace.def:

// autotrace as a menu item
// make sure you have the "autotrace" command-line program installed

Autotrace_item = class 
    Menuaction "_Trace" "convert a bitmap to an SVG file" {
    action x = class 
        _result {
        _vislevel = 3;

        despeckle = Scale "Despeckle level" 1 20 1;
        line = Scale "Line threshold" 1 20 1;
        center = Toggle "Trace centreline" false;
        scale = Scale "SVG scale" 0.1 10 1;

        command 
            = "autotrace %s " ++ join_sep " " 
                [ofmt, ofile, desp, lint, cent]
        {
            prog = search_for_error "autotrace"; 
            ofmt = "-output-format svg";
            ofile = "-output-file %s";
            desp = "-despeckle-level " ++ print despeckle.value;
            lint = "-line-threshold " ++ print line.value;
            cent = if center then "-centerline " else "";
        }

        _result 
            = Image output
        {
            [output] = vips_call "system" 
                [command] 
                [$in => [x.value],
                 $in_format => "%s.ppm", 
                 $out => true,
                 $out_format => "%s.svg[scale=" ++ print scale.value 
++ "]"
                ];
        }
    }
}

It needs nip2 8.3, which should appear very soon.

I had a look at pbmtoascii (it's part of netpbm, not imagemagick, I think), but I'm not sure how well it would work in nip2. There's no easy way to display a text image within nip2, so how would you get feedback on your settings?

[jcupitt]

I've added this menu item to nip2, I should say, it'll be at the bottom of the Filter menu.

Are you talking about pbmtoascii?
In either case, thanks for your work