objective-c - 请问如何实现图片中效果的效果?

Question

更换头像 后面的背景图片跟着头像的颜色更换,但是后面背景图片的颜色比较浅

• 哪位兄弟能提供一点思路?

• 最好提供 demo 演示一下?

Answer 1

Use canvas to load images. HTML5 canvas has a getImageData() method to get the color of a pixel at a certain point, and then lighten the color (you can add transparency to the effect), but the point where you get the pixel may not be the color you want.
I think it’s best to submit it to the server for processing

Answer 2

Isn’t this a white translucent mask?

Answer 3

According to what you said, you need to get the main color of the entire picture, and then set the background to be consistent with the main color, but a slightly lighter color. You can use transparency, or you can also reduce the color depth. If your background is a picture, then you have to change the picture according to the color.

There are quite a few libraries for getting the main color, such as DBImageColorPicker, etc.

Answer 4

It should be a translucent mask on top, and what’s underneath the mask is the enlarged avatar