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: