24ways: articles: 1 row where where "published" is on date 2009-12-01

1 row where "published" is on date 2009-12-01

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Link	rowid ▼	title	contents	year	author	author_slug	published	url	topic
181	181	Working With RGBA Colour	When Tim and I were discussing the redesign of this site last year, one of the clear goals was to have a graphical style without making the pages heavy with a lot of images. When we launched, a lot of people were surprised that the design wasn’t built with PNGs. Instead we’d used RGBA colour values, which is part of the CSS3 specification. What is RGBA Colour? We’re all familiar with specifying colours in CSS using by defining the mix of red, green and blue light required to achieve our tone. This is fine and dandy, but whatever values we specify have one thing in common — the colours are all solid, flat, and well, a bit boring. Flat RGB colours CSS3 introduces a couple of new ways to specify colours, and one of those is RGBA. The A stands for Alpha, which refers to the level of opacity of the colour, or to put it another way, the amount of transparency. This means that we can set not only the red, green and blue values, but also control how much of what’s behind the colour shows through. Like with layers in Photoshop. Don’t We Have Opacity Already? The ability to set the opacity on a colour differs subtly from setting the opacity on an element using the CSS opacity property. Let’s look at an example. Here we have an H1 with foreground and background colours set against a page with a patterned background. Heading with no transparency applied h1 { color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); } By setting the CSS opacity property, we can adjust the transparency of the entire element and its contents: Heading with 50% opacity on the element h1 { color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); opacity: 0.5; } RGBA colour gives us something different – the ability to control the opacity of the individual colours rather than the entire element. So we can set the opacity on just the background: 50% opacity on just the background colour h1 { color: rgb(0, 0, 0); background-color: rgba(255, 255, 255, 0.5); } Or leave the background solid and change the opacity on just th…	2009	Drew McLellan	drewmclellan	2009-12-01T00:00:00+00:00	https://24ways.org/2009/working-with-rgba-colour/	code

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