Calculating colour contrast from hex colour code (php, javascript)

This time I have a nice little snippet to offer you: there is an easy way of calculating contrast from hex colour codes. I needed this on one of my web apps where I wanted to display the background of certain buttons in one colour and wanted the app to automatically calculate if I should set black or white as foreground colour for the button so it's easy to read.

Transferwise pay button

I created a new button on this blog for donations. Scroll all the way to the bottom, you will find it in the right hand side pane: find the Donate button on this blog. If you're already there, why not click it and send me something, of course, if you like the information you're getting here. ;)

How to leave a facebook network

*** EDITED: Unfortunately this solution does not seem to work at this stage as facebook seems to have changed their code to prevent people from being removed from their primary network. I encourage you to report this to them by filling out this form and they might eventually do it for you: http://www.facebook.com/help/contact.php?show_form=profile_bug. As a workaround, you may choose a different network, that you are ok to keep, then you can remove your old network. If anyone reading this has a solution, please feel free to comment below. I'm however keeping the original post for the sake of history tracking. ***

I might be an exception, but it did disturb me a lot to have the name of a network added under my name in facebook when looking in friend lists, such as my friend's friend list, or when you open the link of the list of people who liked a post... etc. You might just want to get rid of your primary network for other reasons (one of the simplest, not part of it anymore), but to be honest, when I tried to remove this annoying network name from below my name, I did not find a solution up until today.

Simple IT Center button based website

Simple IT Center button based websiteA good example as to how to simplify a central information website only using big buttons making sure it's easy to choose from.

Here you go: GetIT Center

Note: I used the image preload setting I explained in my previous post about CSS Preload images (hover backgrounds).

Vista Button with Gimp

Today I was looking for a tutorial about how to create a nice 3D-like button in Gimp (a very good quality freeware image editor) and found this article: Vista Button | Gimp-tutorials.net. It's very detailed and comprehensible, thanks again, dude! ;)