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Nodejs | GM edge() Function
  • Last Updated : 17 Mar, 2020

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 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:






// Include gm library
var 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:




// Include gm library
var 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:




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