Node.js GM threshold() Function
The threshold() function is an inbuilt function in the GraphicsMagick library which is used to modify the image such that any pixel’s intensity value greater than the threshold is assigned the maximum intensity (white), or otherwise is assigned the minimum intensity (black). The function returns the true value of success.
Syntax:
threshold( value, flag )
Parameters: This function accepts two parameters as mentioned above and described below:
- value: This parameter is used to specify the value of the threshold (it can be a percentage).
- flag: This parameter is used to specify whether a given value is a bool value or not. By setting ‘true’, the percentage mode is enabled.
Return Value: This function returns the GraphicsMagick object.
Original Image:
Example 1:
javascript
const gm = require( 'gm' );
.threshold(30, true )
.write( "threshold1.png" , function (err) {
if (!err) console.log( 'done' );
});
|
Output:
Example 2: Overwriting the file.
javascript
const gm = require( 'gm' );
gm(600, 300, 'white' )
.stroke( "green" , 3)
.font( "Helvetica.ttf" , 60)
.drawText(100, 280, "GeeksforGeeks!" )
.threshold(30, false )
.write( "threshold2.png" , function (err) {
if (!err) console.log( 'done' );
});
|
Output:
Reference:
Last Updated :
29 Mar, 2023
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