Lynne

images like PNG and JPEG files get blurry when zoomed in beyond 100% of their size. this is true of video files, too, and many other methods of representing graphics. this is because these files contain an exact description of what to show. they tell the computer what colour each… Read More »Lynne Teaches Tech: Why does text on a webpage stay sharp when you zoom in, even though images get blurry?

keybase is a website that allows you to prove that a given account or website is owned by you. to explain how this works, we’ll need to briefly cover public key cryptography. there are many ways to encrypt a file. one such way involves using a password to encrypt the… Read More »Lynne Teaches Tech: What’s Keybase?

most people count using a decimal system. the lowest digit is 0, followed by 1, 2, and so on, through to 9. when you’re counting up and you reach nine, you need to add another digit. there’s no way to express ten with only one digit, so you use two… Read More »Lynne Teaches Tech: What’s an integer overflow?

when you access a website in your browser, its URL (Universal Resource Location) will almost always start with either https:// or http://. this is known as the schema, and tells the browser what type of connection it’s going to be using, and how it needs to talk to the server.… Read More »Lynne Teaches Tech: What do all the parts of a URL or hyperlink mean?

a web browser is a program that displays a HTML document, in the same way that a text editor is a program that displays a txt file, or a video player displays MP4s, AVIs, etc. HTML has been around for a while, first appearing around 1990. HTML alone is enough… Read More »Lynne Teaches Tech: Why are there so few web browsers?

“defrag” is short for “defragment”. when a file is saved to a hard drive, it is physically written to the device by a needle. when you need to read the file, the needle moves along the portion of the disk that contains the data to read it. let’s say you… Read More »Lynne Teaches Tech: What’s “defragging”?

there are many different methods of file compression. one of the simplest methods is run length encoding (RLE). the idea is simple: say you have a file like this:aaabbbbaaaaayou could store it as:a3b4a5to represent that there are 3 a’s, 4 b’s, etc. you would then simply need a program to… Read More »Lynne Teaches Tech: Why does compressing a JPEG make it look worse, even though putting in a ZIP file makes it look the same?

an operating system (OS), such as windows or macOS, handles a lot of low-level stuff. this means that developers don’t have to worry about details like “how to scroll a page” or “how to read text from a file”, because the OS handles it for you. a computer can’t do… Read More »Lynne Teaches Tech: why don’t windows programs work on a mac, and vice versa?

the “analogue loophole” (or the analog loophole) refers to the idea that no matter how hard you try to make sure nobody can make illegal copies of videos, music, or text, there’s always a “hole” in the protection that occurs when it’s no longer digital. digital content can be protected… Read More »Lynne Teaches Tech: what is the “analogue loophole”?

after downloading the image, OCRbot uses tesseract-ocr to extract the text. this is a free (as in libre and gratis) program that uses neural networks to do the job. it’s been trained on a massive dataset of text and has “learned” what letters usually look like. it knows that a… Read More »Lynne Teaches Tech: How does OCRbot work?