To change the color of the image using CSS filter, it can be done by combining common filter functions. 1. grayscale() can grayscale(), which is often used in the "disabled" state, such as grayscale(100%); 2. sepia() can add retro tones, such as sepia(80%), which is often paired with saturate() or contrast(); 3. hue-rotate() can change the main tones, such as hue-rotate(90deg), which is suitable for adjusting the overall color distribution; 4. Multiple filters can be used in combination, such as sepia(70%) contrast(110%) brightness(95%), which achieves more complex effects, and multiple functions are separated by spaces, and the order does not affect the result.
It is actually not difficult to change the color of the picture using CSS filter. The key is to understand the combination of several commonly used filter functions. Let me directly talk about the key points: The filter attribute allows you to adjust the color, contrast, transparency and other visual effects of web page pictures through code without using image editing software .
Here are a few scenarios and methods you are most likely to use.
1. Use grayscale() to turn the picture into gray
This is one of the most common needs, such as if you want the image to look "disabled" or unify the style.
img {
filter: grayscale(100%);
}-
grayscale(100%)means complete grayscale, the smaller the value, the more color it retains. - This method will not affect the original transparency or contrast of the image.
Tips : You can combine the hover effect to restore the color of the picture when hovering, and enhance the sense of interaction.
img {
filter: grayscale(100%);
transition: filter 0.3s;
}
img:hover {
filter: grayscale(0%);
} 2. Use sepia() to add retro tones to the picture
Want the pictures to look like old photos? sepia() comes in handy.
img {
filter: sepia(80%);
}-
sepia(100%)is the thickest retro color, and the lower the value, the lighter the effect. - It is usually used with
saturate()orcontrast()to bring up a more natural effect.
3. Use hue-rotate() to change the main color of the picture
This function can rotate the hue of the picture, which is suitable for you to make the picture look a certain color overall, such as changing from blue to green.
img {
filter: hue-rotate(90deg);
}- The value of
hue-rotate()is angle, ranging from 0deg to 360deg. - When using it, you may need to try a few more values to find the most suitable color effect.
Note : This filter will not change the light and darkness of the picture, but will only affect the color distribution.
4. Use multiple filter functions in combination
The power of CSS filter is that you can use multiple filters at once.
For example, if you want the picture to turn tan into an old photo style, you can write it like this:
img {
filter: sepia(70%) contrast(110%) brightness(95%);
}Common combinations include:
-
grayscale brightness contrast: controls grayscale and light and dark contrast -
hue-rotate saturate: adjusts hue and saturation -
brightness opacity: creates a "translucent light" effect
Key points : Multiple filters are separated by spaces, and the order does not affect the final effect (but it is recommended to be in logical order when writing).
Basically that's it. Although CSS filter cannot replace professional image processing tools, it is already flexible enough for web design. If you use it too much, you will find that it is actually a very practical visual adjustment tool.
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