Node.js GM edge() Function

The edge() function is an inbuilt function in the GraphicsMagick library which is used to detect edges within an image. The function returns the true value on success.

Syntax:

edge( radius )

Parameters: This function accepts a single parameter as mentioned above and described below:

radius: This parameter is used to specify the radius of the edges within the image.

Return Value: This function returns the GraphicsMagick object.

Example 1:

javascript

// Include gm library
const gm = require('gm');
 
// Import the image
gm('1.png')
 
// Invoke borderColor() function
// and set border color to green
.borderColor('Green')
 
// Invoke resize function
.border(10, 30)
 
// Invoke edge function
.edge(13)
 
// Process and Write the image
.write("edge1.png", function (err) {
      if (!err) console.log('done');
});

Output:

Example 2:

javascript

// Include gm library
const gm = require('gm');
 
// Import the image
gm(600, 300, 'white')
 
// Set the color for the stroke
.stroke("green", 3)
 
// Set the font 
.font("Helvetica.ttf", 60)
 
// Call to drawText Function
.drawText(100, 280, "w3wiki!")
 
// Invoke borderColor() function and
// set border color to green
.borderColor("Green")
 
// Invoke border function
.border(62, 32)
 
// Invoke edge() function
.edge(20)
 
// Process and write the image 
.write("edge2.png", function (err) {
      if (!err) console.log('done');
});

Output:

Reference:

http://www.graphicsmagick.org/GraphicsMagick.html
https://www.npmjs.com/package/gm

javascript

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