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mightyscape-1.1-deprecated/extensions/fablabchemnitz_imagetracerjs/imagetracerjs-master/options.md
2020-08-18 20:17:36 +02:00

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## Options
Using a custom options object:
```javascript
var options = { ltres:2, qtres:1, pathomit:8 }; // Any option can be omitted which will be set to the default
// Adding custom palette. This will override numberofcolors.
options.pal = [{r:0,g:0,b:0,a:255}, {r:0,g:0,b:255,a:255}, {r:255,g:255,b:0,a:255}];
// Using these options and appending the SVG to an element with id="svgcontainer"
ImageTracer.imageToSVG(
'panda.png', /* input filename / URL */
function(svgstr){ ImageTracer.appendSVGString( svgstr, 'svgcontainer' ); }, /* callback function on SVG string result */
options /* custom options object */
);
```
#### Tracing
|Option name|Default value|Meaning|
|-----------|-------------|-------|
|```corsenabled```|```false```|Enable or disable [CORS Image loading](https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image)|
|```ltres```|```1```|Error treshold for straight lines.|
|```qtres```|```1```|Error treshold for quadratic splines.|
|```pathomit```|```8```|Edge node paths shorter than this will be discarded for noise reduction.|
|```rightangleenhance```|```true```|Enhance right angle corners.|
#### Color quantization
|Option name|Default value|Meaning|
|-----------|-------------|-------|
|```colorsampling```|```2```|0: disabled, generating a palette; 1: random sampling; 2: deterministic sampling|
|```numberofcolors```|```16```|Number of colors to use on palette if pal object is not defined.|
|```mincolorratio```|```0```|Color quantization will randomize a color if fewer pixels than (total pixels*mincolorratio) has it.|
|```colorquantcycles```|```3```|Color quantization will be repeated this many times.|
#### Layering
|Option name|Default value|Meaning|
|-----------|-------------|-------|
|```layering```|```0```|0: sequential ; 1: parallel|
#### SVG rendering
|Option name|Default value|Meaning|
|-----------|-------------|-------|
|```strokewidth```|```1```|[SVG stroke-width](https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/stroke-width)|
|```linefilter```|```false```|Enable or disable line filter for noise reduction.|
|```scale```|```1```|Every coordinate will be multiplied with this, to scale the SVG.|
|```roundcoords```|```1```|rounding coordinates to a given decimal place. 1 means rounded to 1 decimal place like 7.3 ; 3 means rounded to 3 places, like 7.356|
|```viewbox```|```false```|Enable or disable SVG viewBox.|
|```desc```|```false```|Enable or disable SVG descriptions.|
#### Blur preprocessing
|Option name|Default value|Meaning|
|-----------|-------------|-------|
|```blurradius```|```0```|Set this to 1..5 for selective Gaussian blur preprocessing.|
|```blurdelta```|```20```|RGBA delta treshold for selective Gaussian blur preprocessing.|
#### Debug
|Option name|Default value|Meaning|
|-----------|-------------|-------|
|```layercontainerid```|No default value|Edge node layers can be visualized if a container div's id is defined.|
|```lcpr```|```0```|Straight line control point radius, if this is greater than zero, small circles will be drawn in the SVG. Do not use this for big/complex images.|
|```qcpr```|```0```|Quadratic spline control point radius, if this is greater than zero, small circles and lines will be drawn in the SVG. Do not use this for big/complex images.|
#### Initial palette
|Option name|Default value|Meaning|
|-----------|-------------|-------|
|```pal```|No default value|Custom palette, an array of color objects: ```[ {r:0,g:0,b:0,a:255}, ... ]```|
---
## Option presets
![Option presets gallery](docimages/option_presets.png)
```javascript
this.optionpresets = {
'default': {
// Tracing
corsenabled : false,
ltres : 1,
qtres : 1,
pathomit : 8,
rightangleenhance : true,
// Color quantization
colorsampling : 2,
numberofcolors : 16,
mincolorratio : 0,
colorquantcycles : 3,
// Layering method
layering : 0,
// SVG rendering
strokewidth : 1,
linefilter : false,
scale : 1,
roundcoords : 1,
viewbox : false,
desc : false,
lcpr : 0,
qcpr : 0,
// Blur
blurradius : 0,
blurdelta : 20
},
'posterized1': { colorsampling:0, numberofcolors:2 },
'posterized2': { numberofcolors:4, blurradius:5 },
'curvy': { ltres:0.01, linefilter:true, rightangleenhance:false },
'sharp': { qtres:0.01, linefilter:false },
'detailed': { pathomit:0, roundcoords:2, ltres:0.5, qtres:0.5, numberofcolors:64 },
'smoothed': { blurradius:5, blurdelta: 64 },
'grayscale': { colorsampling:0, colorquantcycles:1, numberofcolors:7 },
'fixedpalette': { colorsampling:0, colorquantcycles:1, numberofcolors:27 },
'randomsampling1': { colorsampling:1, numberofcolors:8 },
'randomsampling2': { colorsampling:1, numberofcolors:64 },
'artistic1': { colorsampling:0, colorquantcycles:1, pathomit:0, blurradius:5, blurdelta: 64, ltres:0.01, linefilter:true, numberofcolors:16, strokewidth:2 },
'artistic2': { qtres:0.01, colorsampling:0, colorquantcycles:1, numberofcolors:4, strokewidth:0 },
'artistic3': { qtres:10, ltres:10, numberofcolors:8 },
'artistic4': { qtres:10, ltres:10, numberofcolors:64, blurradius:5, blurdelta: 256, strokewidth:2 },
'posterized3': { ltres: 1, qtres: 1, pathomit: 20, rightangleenhance: true, colorsampling: 0, numberofcolors: 3,
mincolorratio: 0, colorquantcycles: 3, blurradius: 3, blurdelta: 20, strokewidth: 0, linefilter: false,
roundcoords: 1, pal: [ { r: 0, g: 0, b: 100, a: 255 }, { r: 255, g: 255, b: 255, a: 255 } ] }
},// End of optionpresets
```