Node.js GM recolor() Function

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');
});

Output:

Reference:

Node.js GM recolor() Function

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