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How to crop an image using crop() function in Node Jimp?
NodeJS – Crop() is an inbuilt function that is used to crop the images. We can use crop to select/crop an image within specified coordinates and dimnesions.
Syntax
crop( x, y, w, h, cb )
Definition of crop() paramters
x – It will hold the value of x co-ordinate of cropping. (Required)
y – It will hold the value of y co-ordinate of cropping. (Required)
w – This parameter is used to store the width of the cropping image. (Required)
h – This parameter is used to store the height of the cropping image. (Required)
cb – This is an optional parameter that can be invoked after the compilation is complete.
Input Image
Using Node JIMP – CROP()
Before proceeding to use crop() functions, please check that the following statements are already executed for setting up the environment.
npm init -y // Initialising the Node environment
npm install jimp --save // Installing the jimp dependency
Create a crop.js file and copy-paste the following code snippet in it.
Use node crop.js to run the code.
Note − The method name should match with the JS file name. Only then it will be able to call the desired method.
Example
const Jimp = require('jimp') ;
async function crop() { // Function name is same as of file name
// Reading Image
const image = await Jimp.read
('/home/jimp/tutorials_point_img.jpg');
image.crop(100, 50, 470, 270)
.write('/home/jimp/crop.jpg');
}
crop(); // Calling the function here using async
console.log("Image is processed successfully");Output
Using Node JIMP – CROP() with 'cb' optional parameters
Example
const Jimp = require('jimp') ;
async function crop() {
// Reading Image
const image = await Jimp.read
('/home/jimp/tutorials_point_img.jpg');
// Checking if any error occurs while cropping
image.crop(150, 0, 1000, 1800, function(err){
if (err) throw err;
})
.write('/home/jimp/crop.jpg');
}
crop();
console.log("Image is processed successfully");Output
/home/jimp/ >> node crop.js // On running the above code snippet Image is processed successfully (node:194779) UnhandledPromiseRejectionWarning: RangeError [ERR_OUT_OF_RANGE]: The value of "offset" is out of range. It must be >= 0 and <= 1119996. Received 1120040 at boundsError (internal/buffer.js:49:9) at Buffer.readUInt32BE (internal/buffer.js:192:5) at Jimp.<anonymous> (/home/jimp/node_modules/@jimp/plugincrop/dist/index.js:43:37) at scan (/home/jimp/node_modules/@jimp/utils/dist/index.js:53:9) at Jimp.scanQuiet (/home/jimp/node_modules/@jimp/core/dist/index.js:1262:32) at Jimp.cropQuiet (/home/jimp/node_modules/@jimp/plugincrop/dist/index.js:42:12)
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