Make a web page screenshot service

I'll take you step by step into how to make a service that takes screenshots of webpages and returns them as an image.

Exploiting perceptual colour difference for edge detection

Think colour isn't important in image processing algorithms? Let's try it both ways, and see for yourself.

Usability Nightmare: Xfce Settings Manager

Rant: Why can't anyone make a good settings screen?

Fighting Blog Comment Spam with Qwen3 and Ollama

When programmers design web sites (comic)

Simulating freehand drawing with Cairo

Four ways of handling asynchronous operations in node.js

Javascript was not designed to do asynchronous operations easily. If it were, then writing asynchronous code would be as easy as writing blocking code. Instead, developers in node.js need to manage many levels of callbacks. Today, we will examine four different methods of performing the same task asynchronously, in node.js.

A Quick Measure of Sortedness

How do you measure the "sortedness" of a list? There are several ways. In the literature this measure is called the "distance to monotonicity" or the "measure of disorder" depending on who you read. Here, I propose another measure for sortedness.

Tool for Creating UML Sequence Diagrams

If you have to draw something called "UML Sequence Diagrams" for work or school, you already know that it can take hours to get a diagram to look right. Here's a web site that will save you some time.

I found Security Vulnerability in your web application