Nodejs | GM quality() Function

The quality() function is an inbuilt function in the GraphicsMagick library which is used to JPEG/MIFF/PNG/TIFF compression level. If filter-type is 4 or less, the specified filter-type is used for all scanlines:0: none, 1: sub, 2: up, 3: average, 4: Paeth. The function returns the true value on success.

Syntax:

quality( level )

Parameters: This function accepts 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:

filter_none

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// Include gm library
var 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');
});

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Output:



Example 2:

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// Include gm library
var 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 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');
});

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Output:

Reference:




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