Node.js GM shade() Function

The shade() function is an inbuilt function in the GraphicsMagick library which is used to shade the image using a distant light source. The function returns the true value of success. 

Syntax:

shade( azimuthal angle, elevation angle )

Parameters: This function accepts two parameters as mentioned above and described below:

• azimuthal angle: This parameter stores the value of the azimuthal angle.
• elevation angle: This parameter stores the value of the elevation angle.

Return Value: This function returns the GraphicsMagick object with an image added. 

Original Image:

Example:

javascript

// Include gm library
const gm = require('gm');

// Import the image
gm('gfg.png')

// Set stroke color
.stroke("#fe1232")

// Set fill color
.fill("#1200ff")

// Draw Rectangle using drawRectangle function
.drawRectangle(10, 2, 130, 30, 1, 2)

// Invoke shadefunction with azimuthal
// as 45 and elevation angle as 90
.shade(45, 90)

// Process and Write the image
.write("shade1.png", function (err) {
    if (!err) console.log('done');
});

Output:

Reference:

• http://www.graphicsmagick.org/GraphicsMagick.html#details-shade
• https://www.npmjs.com/package/gm

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