Node.js GM sharpen() Function

Last Updated : 30 Mar, 2023

The sharpen() function is an inbuilt function in the GraphicsMagick library which is used to sharpen the image. It uses a Gaussian operator of the given radius and standard deviation (sigma).

Syntax:

sharpen( radius, sd )

Parameters: This function accepts two parameters as mentioned above and described below:

radius: This parameter stores the radius value of the sharpness.
sd: It is an optional parameter that stores the standard deviation of the image.

Return Value: This function returns Gmagick to sharpen the image.

Original Image:

Example 1:

javascript

// Include gm library
const gm = require('gm');
 
// Import the image
gm('1.png')
 
// Invoke sharpen function with
// radius as 10 ad standard
// deviation as 2
.sharpen(10, 2)
 
// Process and Write the image
.write("1b.png", function (err) {
    if (!err) console.log('done');
});

Output:

Example 2:

javascript

// Include gm library
const gm = require('gm');
 
// Import the image
gm('1.png')
 
// Set stroke color
.stroke("#fe1232")
 
// Set fill color
.fill("#1200ff")
 
// Draw Rectangle using drawRectangle function
.drawRectangle(10, 2, 130, 30, 1, 2)
 
// Invoke Sharpen Function with radius as 10
.sharpen(10)
 
// Process and Write the image
.write("1a.png", function (err) {
    if (!err) console.log('done');
})