Difference between revisions of "Extension reference"

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''
 
''
 
=Color=
 
=Color=
 +
 
==Brighter==
 
==Brighter==
 
Brightens the color(s) by dividing each RGB channel by 0.9. Channels with a value of 0 remain unaffected. Although brighter and darker are inverse operations, the results of a series of invocations will cause inconstancies due to rounding errors. Use '''More Light''' if you want to brighten up black areas as well.
 
Brightens the color(s) by dividing each RGB channel by 0.9. Channels with a value of 0 remain unaffected. Although brighter and darker are inverse operations, the results of a series of invocations will cause inconstancies due to rounding errors. Use '''More Light''' if you want to brighten up black areas as well.
  
 
==Custom...==
 
==Custom...==
 
'''Note:''' This effect is half broken in 0.45! The original values are overwritten by the new ones, which means things like the last example won't work as expected.
 
  
 
Allows you to evaluate different functions for each channel. '''r''', '''g''' and '''b''' are the ''normalized'' values of the red, green and blue channels. The resulting RGB values are automatically clamped.
 
Allows you to evaluate different functions for each channel. '''r''', '''g''' and '''b''' are the ''normalized'' values of the red, green and blue channels. The resulting RGB values are automatically clamped.
 +
 +
'''Note:''' This effect is half broken in 0.45! The original values are overwritten by the new ones, which means things like the last example won't work as expected.
  
 
===Examples===
 
===Examples===
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:Green Function:'''0.2125 * r + 0.7154 * g + 0.0721 * b'''
 
:Green Function:'''0.2125 * r + 0.7154 * g + 0.0721 * b'''
 
:Blue Function:'''0.2125 * r + 0.7154 * g + 0.0721 * b'''
 
:Blue Function:'''0.2125 * r + 0.7154 * g + 0.0721 * b'''
 
  
 
==Darker==
 
==Darker==
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Inverts each RGB channel (255-value).
 
Inverts each RGB channel (255-value).
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 +
==Randomize==
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 +
Converts to HSL, randomizes hue and/or saturation and/or lightness and converts it back to RGB.
  
 
==Remove Blue==
 
==Remove Blue==
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Sets the red channel to 0.
 
Sets the red channel to 0.
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 +
==Replace Color...==
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 +
Replaces a specific color with another one.
  
 
==RGB Barrel==
 
==RGB Barrel==

Revision as of 01:57, 16 October 2007

A page with info about the Effects and particularly some PNGs / screenshots. To learn more about effects and how to write new ones, check out this page : Inkscape Effects

Color

Brighter

Brightens the color(s) by dividing each RGB channel by 0.9. Channels with a value of 0 remain unaffected. Although brighter and darker are inverse operations, the results of a series of invocations will cause inconstancies due to rounding errors. Use More Light if you want to brighten up black areas as well.

Custom...

Allows you to evaluate different functions for each channel. r, g and b are the normalized values of the red, green and blue channels. The resulting RGB values are automatically clamped.

Note: This effect is half broken in 0.45! The original values are overwritten by the new ones, which means things like the last example won't work as expected.

Examples

Default (doesn't change anything):

Red Function:r
Green Function:g
Blue Function:b

Half the red, swap green and blue:

Red Function:r*0.5
Green Function:b
Blue Function:g

ITU-R Recommendation BT.709 for grayscale:

Red Function:0.2125 * r + 0.7154 * g + 0.0721 * b
Green Function:0.2125 * r + 0.7154 * g + 0.0721 * b
Blue Function:0.2125 * r + 0.7154 * g + 0.0721 * b

Darker

Darkens the color(s) by multiplying each RGB channel with 0.9. Although brighter and darker are inverse operations, the results of a series of invocations will cause inconstancies due to rounding errors. Less Light is usually a better option, because it operates in the HSL color space.

Desaturate

Desaturates the color(s) by dividing the sum of the minimum and maximum channel values by two. Use Grayscale if you want something closer to the human perception of luminance.

Grayscale

Creates a grayscale version of the color(s) via the PAL/NTSC formula (0.299 * RED + 0.587 * GREEN + 0.114 * BLUE).

Less Hue

Converts to HSL color space, subtracts 0.05 from the hue, wraps if necessary, and converts it back to RGB again.

Less Light

Converts to HSL color space, subtracts 0.05 from the lightness, clamps if necessary, and converts it back to RGB again.

Less Saturation

Converts to HSL color space, subtracts 0.05 from the saturation, clamps if necessary, and converts it back to RGB again.

More Hue

Converts to HSL color space, adds 0.05 from to hue, wraps if necessary, and converts it back to RGB again.

More Light

Converts to HSL color space, adds 0.05 from to lightness, clamps if necessary, and converts it back to RGB again.

More Saturation

Converts to HSL color space, adds 0.05 from to saturation, clamps if necessary, and converts it back to RGB again.

Negative

Inverts each RGB channel (255-value).

Randomize

Converts to HSL, randomizes hue and/or saturation and/or lightness and converts it back to RGB.

Remove Blue

Sets the blue channel to 0.

Remove Green

Sets the green channel to 0.

Remove Red

Sets the red channel to 0.

Replace Color...

Replaces a specific color with another one.

RGB Barrel

Rotates the RGB channels (RGB->BRG->GBR->RGB...).

Developer Examples

Export

Groups to PNGs

Generate from Path

Inset/Outset Halo

InsetOutsetExample.png

Parameters:

Width
20
Number of steps
5

Creates translucent copies of the path inside and outside the path.

Extrude

ExtrudeExample.png

Parameters:

Magnitude
20
Angle
45

Interpolate

Outline

Iterpolate does a linear interpolation between 2 or more paths. It basically means that it "fills in the gaps" between the paths according to the number of steps given.

Basic Usage

To use the interpolation effect, select the paths that you wish to interpolate, and go to Effects > Generate From Path > Interpolate. Choose your options, and Click OK.

Basic Example

View figure 1 below, where there are 2 identical paths.

Interpolate1.png


Here is the result when the interpolation effect is called with a "Steps" value of 6.

Interpolate2.png


Options

One of the great features of the inkscape interpolation is "transform style", which transforms the

It appears that you need to convert an object to a path first (Path > Object to path ; Shift-Ctrl-c). You can alter the number of steps used and choose one of two methods.

File:Interpolate blueSquare-redCircle.png

Pattern along Path

Star pattern and a line path:

PatternAlongPathExample1.png

Pattern along path:

PatternAlongPathExample2.png

Parameters:

Copies of the pattern
repeated
Deformation type
snake
Space between copies
0
Normal offset
0
Tangential offset
0
Pattern is vertical
unchecked
Duplicate the pattern before deformation
checked

PatternAlongPathExample3.png

Modified parameter:

Deformation type
ribbon

Images

Modify Path

Envelope

Add Nodes

Color Markers to Match Stroke

Flatten Beziers

FlattenBeziersExample.png

Parameters:

Flatness
10

Fractalize

FractalizeExample.png

Parameters:

Subdivisions
6
Smoothness
4.0

Jitter nodes

JitterNodesExample.png

Parameters:

Maximum Displacement
50.0
Shift Nodes
checked
Shift Node Handles
checked
Use Normal Distribution
checked

Perspective

Straighten Segments

StraightenSegmentsExample.png

Parameters:

Percent
50
Behavior
1

Render

Visualise Path

Number Nodes

NumberNodesExample.png

Parameters:

Font Size
20
Dot Size
10px

Kochify

To use, select one path consisting of only line segments and apply the effect. Kochify will replace the given path with a path that has a copy of the original path in between each two adjacent nodes in the original path. If the original path input has bezier curves, the effect will effectively replace them with lines and then apply the effect. For more information about Kochify from a developers perspective, look here. Requires: python.