Node.js GM recolor() Function

Last Updated : 31 Mar, 2023

The recolor() function is an inbuilt function in the GraphicsMagick library which is used to apply a color translation matrix to the image channels. The function returns the true value of success.

Syntax:

recolor( matrix )

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

Matrix: This parameter is used to specify the value as a string of a matrix which is decoded as a color transformation matrix.

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 recolor function
.recolor('4 0 0, 0 6 0, 9 0 1')
 
// Process and Write the image
.write("recolor1.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 recolor function
.recolor('10 0 0, 2 6 0, 9 0 5')
 
// Process and write the image
.write("recolor2.png", function (err) {
    if (!err) console.log('done');
});