Understanding Basic Image Processing Algorithms A Hands-on JavaScript Tutorial

image processing in node js

With the help of Javascript libraries and frameworks, developers can create dynamic visuals using image processing in the browser. Image processing is one such task that can benefit from parallel execution. In this article, we’ll explore how to leverage Node.js’ worker_threads module to process images asynchronously, improving performance and responsiveness.

Custom Jimp

image processing in node js

If you’re considering using Jimp as your primary image processor, check out the full documentation on the official GitHub and npm pages. The blur() method blurs an image by r pixels using a blur algorithm that produces an effect similar to a Gaussian blur, only much faster. Jimp offers both callback- and Promise-based APIs for manipulating images. If your web application supports user-uploaded images, you probably need to transform them to fit the design specification of your app. Large images are frustrating to deal with since they take forever to load and are even more frustrating to store into the database. There’s a way we can make our images more user-friendly, loader faster, and even higher quality.

  1. However, for this tutorial, we’ll take a brief look at some of the main functions from this module as well.
  2. Additionally, developers should be aware of the various image formats available and choose the best format for their project.
  3. Another common use case is to watermark an image with a logo.
  4. Here are a few tips on how tosetup a development environment for image-js.

Sharp: A High-Performance Image Processing Library for Node.js

Sharp can read JPEG, PNG, WebP, AVIF, TIFF, GIF, and SVG image formats. This module can produce images in JPEG, PNG, WebP, AVIF, and TIFF formats as well as uncompressed raw pixel data. At the time of writing, sharp doesn’t have a native way of adding text to an image. To add text, first, you’ll write code to draw text using Scalable Vector Graphics(SVG). Once you’ve created the SVG image, you’ll write code to composite the image with the sammy.png image using the composite method. You will receive no output, but an image file sammy-resized-compressed.jpeg is saved in your project directory.

Challenges of Using Javascript for Image Processing

Jimp exposes parseBitmap so you can fall back to jimp to do the heavy lifting. Resizing an image is typically 4x-5x faster than using thequickest ImageMagick and GraphicsMagick settingsdue to its use of libvips. We read every piece of feedback, and take your input https://traderoom.info/ very seriously. Setting x to 50% draws the text in the middle of the container on the x-axis, and setting y to 50% positions the text in the middle on y-axis of the SVG image. We’re printing out the value to our console and checking if there’s an error.

image processing in node js

The rotate() method rotates an image clockwise by a given number of degrees. You can also calculate the raw pHash (no padding or custom base). You can then use this in distanceFromHash to calculate the hash distance from a loaded image.

image processing in node js

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Enter y to save the changes you made in the file, and confirm the file name by pressing ENTER or RETURN key. The documentation provides a list of the options for each of the above functions. The ImageMagick module has been unmaintained for some time and the developers even advise using the GraphicsMagick module instead. However, for this tutorial, we’ll take a brief look at some of the main functions from this module as well.

Now that you’ve read an image and extracted its metadata, you’ll now resize an image, change its format, and compress it. Now, when you use sharp() to read the image, it creates a sharp instance. You then chain the metadata() method of the sharp module to the instance. The method returns an object containing the image metadata, which you store in the metadata variable and log its contents using console.log().

Convolution filters are algorithms that allow developers to adjust brightness, contrast, saturation, hue, and other parameters. Sharp is a high-performance Node.js module for resizing, converting, and manipulating images in various formats. It’s built around the libvips library and provides https://traderoom.info/10-best-node-js-image-manipulation-libraries-in/ a simple but powerful API for image processing. In this section, you’ll composite sammy-transparent.png over the underwater.png. This will create an illusion of sammy swimming deep in the ocean. To composite the images, you’ll chain the composite() method to the sharp instance.

We chain the flop() method to the sharp instance to flop the image over the y-axis. We chain the flip() method to the sharp instance to flip the image over the x-axis. In this example, we generate a cropping box 500px wide by 300px high and positioned 740px from the image’s left border and 340px from the image’s top border. With the extract method, any part of the image that fits inside the box will be retained. We use the metadata() function to extract the image metadata. We save the metadata variable and log to the terminal using console.log().

Next, you’ll save the SVG image as a png with sharp so that you can see how SVG is drawing the text. Once that is done, you’ll composite the SVG image with sammy.png. You gave the svg element a width of 750 and height of 483 so that the SVG image will have the same size as sammy.png. This will help in making the text look centered on the sammy.png image. Without specifying any options, GraphicsMagick will maintain the aspect ratio of the original image. If both width and height are given, the image will be resized until it reaches the maximum value for one or the other.

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