Excuse me, what is the name of this technology that puts forward the dark part of a photo, uses one color (such as red) as the background color in the bright part, and only presents red and black as a

Excuse me, what is the name of this technology that puts forward the dark part of a photo, uses one color (such as red) as the background color in the bright part, and only presents red and black as a whole? I don't know if there are any specific terms, but I know roughly what you want to know!

I have an image processing plug-in here, which can get the effect of your picture. Color and black and white can be treated like this.

Here is: filter-"coloring", which changes the color into a single tone. By adjustment, you can change various colors and their shades!

Whether it is black and white or color, even monochrome, it will change from depth to light and shade. It is wrong to call it bicolor. Is it better to call it full color (all the same color)?

Approximate effect:

original drawing

monocolour

monocolour