The filter attribute of CSS can add a variety of visual effects to web elements. Common filters include 1.grayscale() grayscale processing, 2.sepia() browning, 3.saturate() saturation adjustment, 4.hue-rotate() hue transformation, 5.invert() color inversion, 6.brightness() brightness adjustment, 7.contrast() contrast adjustment, 8.blur() blur, 9.drop-shadow() shadow; multiple filters can be superimposed and smooth animations can be achieved with transition. They are suitable for hover interaction, background effects and other scenarios, but attention should be paid to performance and compatibility issues.
filter attribute of CSS is a very practical tool that allows you to easily add various visual effects on web pages, such as blur, contrast adjustment, grayscale processing, etc. It not only makes the page look more interesting, but it can also be used to enhance the interactive experience or preview the image.
Here are some common usage scenarios and specific suggestions:
Basic usage of image filters
filter attribute can be directly applied to pictures, background images and even videos. Its syntax is simple:
img {
filter: brightness(50%);
}The above code will reduce the brightness of the picture to 50%. You can superimpose multiple filters, separated by spaces:
filter: grayscale(100%) contrast(200%);
Commonly used basic filters include:
-
grayscale(): Set the grayscale of the image -
sepia(): Set the brownness of the image -
saturate(): Adjust color saturation -
hue-rotate(): Change the hue -
invert(): Invert color -
brightness(): adjust the brightness -
contrast(): Adjust the contrast -
blur(): blur image -
drop-shadow(): Add shadow (similar tobox-shadow, but suitable for graphic content)
Note: blur() and drop-shadow() affect performance comparison, especially when using large images or dynamic elements.
Making hover effect improves interaction
A common practice is to apply some filter changes to enhance the sense of interaction when the mouse is hovering over the picture. For example:
.thumbnail {
filter: grayscale(30%);
transition: filter 0.3s ease;
}
.thumbnail:hover {
filter: grayscale(0%) brightness(100%);
}The advantage of this is that the user can intuitively perceive operability, which is suitable for content display areas such as gallery, card layout, etc.
Tips:
- Use
transitionto smooth the filter changes - Don't add too many filters at once, as it can easily cause visual confusion
- Mobile terminals should pay attention to performance issues, especially when complex filters are used in the sliding list
Coupled with pseudo-elements as background effects
You can also combine pseudo-elements such as ::before or ::after ) to add filter effects to the background. For example, make a translucent black mask with a little blur:
.container {
position: relative;
}
.container::before {
content: "";
position: absolute;
top: 0; left: 0;
width: 100%; height: 100%;
background: rgba(0, 0, 0, 0.5);
backdrop-filter: blur(5px);
-webkit-backdrop-filter: blur(5px); /* compatible with Safari */
} backdrop-filter is used here instead of ordinary filter , because it will only affect the background part and will not change the content of the current element itself. This technique is often used for background blur effect of modal boxes and pop-up layers.
It should be noted that backdrop-filter has average compatibility in some browsers. It is best to check the browser support status of the target user before using it.
Basically that's it. Although the filter attribute of CSS is simple, it is very flexible in actual projects and can produce many interesting effects. As long as you master a few commonly used functions and combine them with transition animations and pseudo-elements, you can achieve many cool and practical designs.
The above is the detailed content of Applying visual effects using css filter property. For more information, please follow other related articles on the PHP Chinese website!
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