- #Image quality with copyimage generator
- #Image quality with copyimage upgrade
- #Image quality with copyimage code
Once you have the data you can manipulate it, either pixel by pixel or using the canvas API.Ĭaveat: the image must be on the same domain as the code that modifies the canvas because of security reasons. Anything that is an image can be a data source for a canvas: an img element, a video element or even another canvas.
One of the things canvas is good at is modifying images. The first thing we need to create a logo from an image containing a font set is to modify images. Var canvas = document.querySelector('canvas') The reference is there to modify the element itself (for example resize it) and the context gives you the API to modify it. To work with canvas, you need two things: a reference to the canvas element and one to its context. The HTML needed for the examples in this article is basic: Once you understand it, this is a very powerful feature, though.įor this purpose here, we won't need the whole API, just a few parts of it. Furthermore, it has a dynamic coordinate system, which is quite a brain-teaser the first time you use it. It has many ways to manipulate your brush and the fill you are using. It allows you to paint on the canvas using rectangles, lines, arcs and gradients. The canvas API is rudimentary, but also powerful. It also means that social media sites like Facebook index it and show the image as the thumbnail. This not only makes people happier who can not change their browser. When I use canvas for animations I tend to provide a static image as the fallback. Is not something we should consider good fallback content.
#Image quality with copyimage upgrade
Quick aside: "This product uses canvas and needs JavaScript and your browser doesn't support it, upgrade to something useful, you monkey" Of course, it is still good to have it in your document as you can provide fallback content inside it.
So, it's role in markup is to be a placeholder for functionality that is relying on JS. It does exactly nothing without JavaScript interaction.
The canvas element is a weird one in HTML. Originally, I planned to create a fiddle for each example, but I have no internet right now. The whole article and demos is hosted on GitHub, so feel free to download and play with the examples. In this article, I will explain how I did some of that, repeat some canvas basics and show simpler examples of the editor features.
#Image quality with copyimage generator
Many years ago (15, to be exact) I created a logo generator that allows you to put together a logo from a charset pixeled on a C64. Demo: Hacking around lack of download supportĭuring my time off from work, I went back to one of my old passions: pixeling stuff on a Commodore 64.Workaround for lacking download support.Canvas, images and pixels - things I learned building an 8 bit logo generator Canvas, images and pixels - things I learned building an 8 bit logo generator Table of Contents
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