The modulate() function is an inbuilt function in the GraphicsMagick library which is used to vary the brightness, saturation, and hue of an image. The function returns the true value of success.
Syntax:
modulate( brightness, saturation, hue )
Parameters: This function accepts three parameters as mentioned above and described below:
- Brightness: This parameter is used to specify the value of the brightness level.
- Saturation: This parameter is used to specify the value of the saturation level.
- Hue: This parameter is used to specify the value of the hue level.
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 borderColor() function // and set border color to green .borderColor('Green')
// Invoke resize function .border(10, 30) // Invoke modulate function .modulate(50, 50, 50) // Process and Write the image .write("modulate1.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 motionBlur() function .modulate(120, 110, 130) // Process and write the image .write("modulate2.png", function (err) {
if (!err) console.log('done');
}); |
Output:
Reference: