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