Upper layer range from 0 - 255 from lower to upper and Lower Layer range from 0 - 255 from left to right in all RGB channels. When Upper Layer's mode change to Linear Burn, it will blend in and darken the lower layer and produce the Linear Burn sample image above.
By analysing the samples images we can see that the any part of the lower layer never get whiter. The pixels get darker when the upper layer's pixel is darker.
This mode is useful for color enhancement or special effects..
Linear Burn darken the color of lower layer with the color of upper layer. It is almost same as Color Burn, but the result is even darker as the color get darker, and the final result will never lighter than content of lower layer. See the sample layers below.
Instead of immediately showing you how to do a cool layer mode trick that might be rarely use by you, we will explain the true mechanism working behind every layer mode. By fully understanding the fundamental of every layer mode, you will be able to apply layer mode into any problem you might run into when the time come.
Layer mode is about blending the content of two or more layers together to produce intended result. The result of one blending can be both final artistically result or intermediate result that use for further image correction or enchancement.
Layer mode blending the content of layers by calculating the Red, Green and Blue value of every pixels against its lower layer Red, Green and Blue value. Almost all layer mode do calculation on each color channel separately, that is mean upper layer Red value will be only use for calculating against lower layer Red value, and same thing happen to Green and Blue.
While most of the layer mode do calculation on RGB channel, some layer mode do use HSB(Hue, saturation and brightness) for the calculation, e.g. Hue, saturation, color and luminosity mode.