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, "GeeksforGeeks!")

// 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