Node.js GM quality() Function
The quality() function is an inbuilt function in the GraphicsMagick library which is used for JPEG/MIFF/PNG/TIFF compression levels. If the filter type is 4 or less, the specified filter type is used for all scanlines:0: none, 1: sub, 2: up, 3: average, 4: Path. The function returns the true value on success.
Syntax:
quality( level )
Parameters: This function accepts a single parameter which is mentioned above and defined below:
- level: This parameter is used to specify the level of the quality.
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 quality function with // average parameter .quality(3) // Process and Write the image .write( "quality1.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 quality function with // sub-option via 1 // 0: none // 1: sub // 2: up // 3: average // 4: Paeth .quality(1) // Process and write the image .write( "quality2.png" , function (err) { if (!err) console.log( 'done' ); }); |
Output:
Reference:
- http://www.graphicsmagick.org/GraphicsMagick.html#details-quality
- https://www.npmjs.com/package/gm
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