Let's say I have
<div class="myDiv">Hi there</div> I want to put a background-image and give it an opacity of 0.5 – but I want that the text I have written will have full opacity (1).
If I would write the CSS like this
.myDiv { opacity:0.5 } everything will be in low opacity – and I don't want that.
So my question is – How can I get low-opacity background image with full opacity text?
So here is an other way:
background-image: linear-gradient(rgba(255,255,255,0.5), rgba(255,255,255,0.5)), url("your_image.png"); 
linear-gradient. The accepted answer I wrote is over 4 years old ;)
Nope, this cannot be done since opacity affects the whole element including its content and there's no way to alter this behavior. You can work around this with the two following methods.
Add another div element to the container to hold the background. This is the most cross-browser friendly method and will work even on IE6.
HTML
<div class="myDiv"> <div class="bg"></div> Hi there </div> CSS
.myDiv { position: relative; z-index: 1; } .myDiv .bg { position: absolute; z-index: -1; top: 0; bottom: 0; left: 0; right: 0; background: url(test.jpg) center center; opacity: .4; width: 100%; height: 100%; } Another trick is to use the CSS 2.1 :before or CSS 3 ::before pseudo-elements. :before pseudo-element is supported in IE from version 8, while the ::before pseudo-element is not supported at all. This will hopefully be rectified in version 10.
HTML
<div class="myDiv"> Hi there </div> CSS
.myDiv { position: relative; z-index: 1; } .myDiv:before { content: ""; position: absolute; z-index: -1; top: 0; bottom: 0; left: 0; right: 0; background: url(test.jpg) center center; opacity: .4; } Due to the behavior of z-index you will have to set a z-index for the container as well as a negative z-index for the background image.
See test case on jsFiddle:
width: 100%; height: 100%; to the .bg so that ie6 can spread the bg inside the parent div. jsfiddle.net/sbGb4/2
z-index is a pain, but this should be relatively safe as long as you give the parent a positive index.::before pseudo-element. Was this the one you were looking for?div { width: 200px; height: 200px; display: block; position: relative; } div::after { content: ""; background: url(image.jpg); opacity: 0.5; top: 0; left: 0; bottom: 0; right: 0; position: absolute; z-index: -1; } <div> put your div content</div> I implemented Marcus Ekwall's solution but was able to remove a few things to make it simpler and it still works. Maybe 2017 version of html/css?
html:
<div id="content"> <div id='bg'></div> <h2>What is Lorem Ipsum?</h2> <p><strong>Lorem Ipsum</strong> is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p> </div> css:
#content { text-align: left; width: 75%; margin: auto; position: relative; } #bg { position: absolute; top: 0; bottom: 0; left: 0; right: 0; background: url('https://static.pexels.com/photos/6644/sea-water-ocean-waves.jpg') center center; opacity: .4; width: 100%; height: 100%; } Hello to everybody I did this and it worked well
var canvas, ctx; function init() { canvas = document.getElementById('color'); ctx = canvas.getContext('2d'); ctx.save(); ctx.fillStyle = '#bfbfbf'; // #00843D // 118846 ctx.fillRect(0, 0, 490, 490); ctx.restore(); }section{ height: 400px; background: url(https://images.pexels.com/photos/265087/pexels-photo-265087.jpeg?w=1260&h=750&auto=compress&cs=tinysrgb); background-repeat: no-repeat; background-position: center; background-size: cover; position: relative; } canvas { width: 100%; height: 400px; opacity: 0.9; } #text { position: absolute; top: 10%; left: 0; width: 100%; text-align: center; } .middle{ text-align: center; } section small{ background-color: #262626; padding: 12px; color: whitesmoke; letter-spacing: 1.5px; } section i{ color: white; background-color: grey; } section h1{ opacity: 0.8; }<html lang="en"> <head> <meta charset="UTF-8"> <title>Metrics</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons"> </head> <body onload="init();"> <section> <canvas id="color"></canvas> <div class="w3-container middle" id="text"> <i class="material-icons w3-highway-blue" style="font-size:60px;">assessment</i> <h1>Medimos las acciones de tus ventas y disenamos en la WEB tu Marca.</h1> <small>Metrics & WEB</small> </div> </section> The approach of using an inner absolute element with 100% width and height didn't work for me due to how the layout changed and the how impractical it was to keep track.
So I came up with a solution; rendering the image to a canvas with a set alpha, and then getting a blob URL from the canvas.
async function generateDataUrlFromImage(src: string, opacity: number) { return new Promise(async (resolve) => { const img = document.createElement('img'); img.src = src; await img.decode(); const canvas = document.createElement('canvas'); canvas.width = img.naturalWidth; canvas.height = img.naturalHeight; const ctx = canvas.getContext('2d')!; ctx.globalAlpha = opacity / 100; ctx.drawImage(img, 0, 0); canvas.toBlob((blob) => { resolve(URL.createObjectURL(blob!)); }); }); } Not the most efficient, but it's foolproof in terms of layout since you can really use background-image. It might not be performant enough for other images, the image that I needed to use was a small 150x150px pattern so it's good enough; I benched it at about 20ms.
This can be done by using the different div class for the text Hi There...
<div class="myDiv"> <div class="bg"> <p> Hi there</p> </div> </div> Now you can apply the styles to the
tag. otherwise for bg class. I am sure it works fine
None of the solutions worked for me. If everything else fails, get the picture to Photoshop and apply some effect. 5 minutes versus so much time on this...
<!DOCTYPE html> <html> <head></head> <body> <div style=" background-color: #00000088"> Hi there </div> <!-- #00 would be r, 00 would be g, 00 would be b, 88 would be a. --> </body> </html> including 4 sets of numbers would make it rgba, not cmyk, but either way would work (rgba= 00000088, cmyk= 0%, 0%, 0%, 50%)
