Node.js GM gamma() Function

The gamma() function is an inbuilt function in the GraphicsMagick library which is used to level of gamma correction. The function returns the true value on success.

Syntax:

gamma(red, green, blue)

Parameters: This function accepts three parameters as red, green, and blue which correct the gamma level of red, green, and blue colors respectively.

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 gamma function
.gamma(1, 3.4, 6)

// Process and Write the image
.write"gamma1.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 borderColor() function
// and set border color to green
.borderColor("Green")

// Invoke border function
.border(62, 32)

// Invoke gamma function
.gamma(3, 45, 10)

// Process and Write the image
.write("gamma2.png", function (err) {
      if (!err) console.log('done');
});

Output:

Reference:

Node.js GM gamma() Function

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