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Nodejs | GM gamma() Function

  • Last Updated : 16 Apr, 2020

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 color respectively.

Return Value: This function returns the GraphicsMagick object.

Example 1:




// Include gm library
var 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:




// Include gm library
var 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:




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