SVG <feFuncR> Element
SVG stands for Scalable Vector Graphic. It can be used to make graphics and animations like in HTML canvas.
In this article, we will learn about the <feFuncR> element which is an SVG filter primitive that is used to transfer function for the red component of the input graphic of its parent <feComponentTransfer> element. <feComponentTransfer> element implements color manipulations on each color channel separately.
The four color channels of this element are as follows.
- <feFuncR> element: This element is used to transfer function for the red component of the input graphic of its parent <feComponentTransfer> element.
- <feFuncG> element: This element is used to transfer function for the green component of the input graphic of its parent <feComponentTransfer> element.
- <feFuncB> element: This element is used to transfer function for the blue component of the input graphic of its parent <feComponentTransfer> element.
- <feFuncA> element: This element is used to transfer function for the alpha component of the input graphic of its parent <feComponentTransfer> element.
Note: Remember when you perform color manipulations the element should only have one child element of each type.
Syntax:
<feFuncR type="type_name" tableValues="value_name"/>
The core attribute used:
- id: It is used to assign a unique name to an element
- lang: It is used to specify the primary language used in contents and attributes containing text content of particular elements.
- tabindex: It is used to allow you to control whether an element is focusable and to define the relative order of the element for the purposes of sequential focus navigation.
- xml:base: It is used to specify a base IRI other than the base IRI of the document or external entity.
- xml:lang: It is used to be the primary language used in contents and attributes containing text content of particular elements.
- xml:space: It is used to handle whitespace characters inside elements.
Transfer function attributes:
- type: It is a generic attribute and it has different meanings based on the context in which it’s used.
- tableValues: It is used to define a list of numbers defining a lookup table of values for a color component transfer function.
- slope: It is used to indicate the vertical stroke angle of a font.
- intercept: It is used to define the intercept of the linear function of color component transfers when the type attribute is set to linear.
- amplitude: It is used to control the amplitude of the gamma function of a component transfer element when its type attribute is gamma.
- exponent: It is used to define the exponent of the gamma function.
Example 1: In the below code, we will make use of the SVG <feFuncR> element.
HTML
<!DOCTYPE html> < html > < body > < svg width = "640" height = "550" viewBox = "0 0 640 550" > < defs > < filter id = "new" filterUnits = "objectBoundingBox" x = "0%" y = "0%" width = "100%" height = "100%" > < feComponentTransfer > < feFuncR type = "table" tableValues = "0 0 1 0" /> </ feComponentTransfer > </ filter > </ defs > < image x = "10" y = "10" width = "280" height = "350" preserveAspectRatio = "true" xlink:href = "https://media.w3wiki.net/wp-content/uploads/20210915115837/gfg3-300x300.png" /> < image x = "310" y = "10" width = "280" height = "350" preserveAspectRatio = "true" filter = "url(#new)" xlink:href = "https://media.w3wiki.net/wp-content/uploads/20210915115837/gfg3-300x300.png" /> </ svg > </ body > </ html > |
Output:
Example 2: In the below code, we will make use of the <feFuncR> element.
HTML
<!DOCTYPE html> < html > < body > < svg width = "640" height = "550" viewBox = "0 0 640 550" > < defs > < filter id = "new" filterUnits = "objectBoundingBox" x = "0%" y = "0%" width = "100%" height = "100%" > < feComponentTransfer > < feFuncR type = "table" tableValues = "1 0 0 0" /> </ feComponentTransfer > </ filter > </ defs > < image x = "10" y = "10" width = "280" height = "350" preserveAspectRatio = "true" xlink:href = "https://media.w3wiki.net/wp-content/uploads/20210915115837/gfg3-300x300.png" /> < image x = "310" y = "10" width = "280" height = "350" preserveAspectRatio = "true" filter = "url(#new)" xlink:href = "https://media.w3wiki.net/wp-content/uploads/20210915115837/gfg3-300x300.png" /> </ svg > </ body > </ html > |
Output:
Reference: https://developer.mozilla.org/en-US/docs/Web/SVG/Element/feFuncR
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