CSS can be used to apply a dark filter to an image

Question

CSS can be used to apply a dark filter to an image

Recently, I came across a unique challenge involving a div with an image background:

<div class="image-cover" style={{ backgroundImage: 'url(' + item.image + ')' }}>
      <div className="name">{item.name}</div>
</div>

(this code is written in React and the above div has the image set as a background.)

I was looking to add a dark gradient overlay on the image, starting from the bottom and fading up. Most online resources suggest adding the image directly to the CSS for such effects. However, my case involves dynamic assignment of the image URL during runtime through HTML.

Do you have any suggestions on how I can achieve this desired effect of darkening the image within this setup?

javascript html css

Answer 1

Answer №1

To create a unique design, you can blend an image and a gradient together in the following ways:

div {
  height: 200px;
  width: 500px;
  background-image:
    linear-gradient(black,
                    transparent 20%,
                    transparent 80%,
                    black),
    url(http://lorempixel.com/500/200/nature/1/);
}

<div></div>

Another approach is to utilize a pseudo element for a different effect:

div {
  height: 200px;
  width: 500px;
  background: url(http://lorempixel.com/500/200/nature/1/);
}
div::after {
  content: '';
  display: block;
  height: 200px;
  width: 500px;
  background: linear-gradient(transparent, black);
}

<div></div>

Answer 2

To create a unique design, you can blend an image and a gradient together in the following ways:

div {
  height: 200px;
  width: 500px;
  background-image:
    linear-gradient(black,
                    transparent 20%,
                    transparent 80%,
                    black),
    url(http://lorempixel.com/500/200/nature/1/);
}

<div></div>

Another approach is to utilize a pseudo element for a different effect:

div {
  height: 200px;
  width: 500px;
  background: url(http://lorempixel.com/500/200/nature/1/);
}
div::after {
  content: '';
  display: block;
  height: 200px;
  width: 500px;
  background: linear-gradient(transparent, black);
}

<div></div>

Answer 3

Answer №2

To achieve the desired visual effect, I utilized a linear-gradient background for the div's ::before pseudo-element. The strategy involves overlaying the div with its ::before pseudo-element and then applying a gradient background to it:

.image-overlay {
    position: relative;
}

.image-overlay::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* Adjust the color values to achieve the desired opacity */
    background: linear-gradient(to top, rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 0.25));
}

For a demonstration of this technique in action, refer to this JSFiddle link.

Answer 4

To achieve the desired visual effect, I utilized a linear-gradient background for the div's ::before pseudo-element. The strategy involves overlaying the div with its ::before pseudo-element and then applying a gradient background to it:

.image-overlay {
    position: relative;
}

.image-overlay::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* Adjust the color values to achieve the desired opacity */
    background: linear-gradient(to top, rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 0.25));
}

For a demonstration of this technique in action, refer to this JSFiddle link.

Answer 5

Answer №3

Inset Box-Shadow

Benefit: concise code, no extra pseudo-element required

Drawback: The size and offset values for the box shadow in the current W3 standard can only be absolute (not percentage-based), making it difficult to handle dynamically changing sizes of the shadowed element without JavaScript calculating the dimensions.

While there are superior solutions available, here is an alternative option (less optimal).

div {
  display: inline-block;
  background:url(http://unsplash.it/200/200);
  width:200px;
  height:200px;      
}

.darkened{
  box-shadow: inset 0 -200px 200px -100px rgba(0,0,0,.9);
}

<div></div>
<div class="darkened"></div>

Answer 6

Inset Box-Shadow

Benefit: concise code, no extra pseudo-element required

Drawback: The size and offset values for the box shadow in the current W3 standard can only be absolute (not percentage-based), making it difficult to handle dynamically changing sizes of the shadowed element without JavaScript calculating the dimensions.

While there are superior solutions available, here is an alternative option (less optimal).

div {
  display: inline-block;
  background:url(http://unsplash.it/200/200);
  width:200px;
  height:200px;      
}

.darkened{
  box-shadow: inset 0 -200px 200px -100px rgba(0,0,0,.9);
}

<div></div>
<div class="darkened"></div>

Answer 7

Answer №4

Need help setting multiple backgrounds for an element using code?

let myImageURL = "https://i.sstatic.net/QqkeF.png"; // example image URL
let cssBackgroundURL = "url(" + myImageURL + ")"; // convert to CSS background URL format
let gradientPattern = "linear-gradient(to top, rgba(0, 0, 0, 1), rgba(255, 0, 0, 0))";
element.style.backgroundImage = gradientPattern + "," + cssBackgroundURL;

<div id="element" style="height:128px; width: 256px;">
    #element
</div>

,

To dynamically convert and add image URLs as background images in CSS, create a custom gradient pattern and include them as a comma-separated list in the backgroundImage property of the element's style attribute.

I used the variable name element for demonstration purposes - feel free to use document.getElementById.

Edit: Your code looks good! You can easily incorporate the background image list into your templates based on the above standalone code snippet I provided for testing.

Answer 8

Need help setting multiple backgrounds for an element using code?

let myImageURL = "https://i.sstatic.net/QqkeF.png"; // example image URL
let cssBackgroundURL = "url(" + myImageURL + ")"; // convert to CSS background URL format
let gradientPattern = "linear-gradient(to top, rgba(0, 0, 0, 1), rgba(255, 0, 0, 0))";
element.style.backgroundImage = gradientPattern + "," + cssBackgroundURL;

<div id="element" style="height:128px; width: 256px;">
    #element
</div>

,

To dynamically convert and add image URLs as background images in CSS, create a custom gradient pattern and include them as a comma-separated list in the backgroundImage property of the element's style attribute.

I used the variable name element for demonstration purposes - feel free to use document.getElementById.

Edit: Your code looks good! You can easily incorporate the background image list into your templates based on the above standalone code snippet I provided for testing.

CSS can be used to apply a dark filter to an image

Answer №1

Answer №2

Answer №3

Inset Box-Shadow

Answer №4

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