Node.js GM equalize() Function
The equalize() function is an inbuilt function in the GraphicsMagick library which is used to perform histogram equalization to the image. The function returns the true value of success.
Syntax:
equalize()
Parameters: This function does not accept any parameters.
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 equalize function .equalize() // Process and Write the image .write( "equalize1.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, "w3wiki!" ) // Invoke borderColor() function // and set border color to green .borderColor( "Green" ) // Invoke border function .border(62, 32) // Invoke equalize() function .equalize() // Process and write the image .write( "equalize2.png" , function (err) { if (!err) console.log( 'done' ); }); |
Output:
Reference:
- http://www.graphicsmagick.org/GraphicsMagick.html
- https://www.npmjs.com/package/gm