The tutorial mainly uses Photoshop to explain the layer blending mode brightening effect through the example, the blending mode of a layer refers to the superposition mode between two layers, that is, the stack effect of multiple layers, and if only one layer cannot be superimposed, it is necessary to have two layers or more than two layers to achieve the blending mode of the layer. The layer mode of Photoshop is divided into 6 groups, which are "normal" and "dissolve" which are not dependent on the underlying image. To darken the underlying image of the "dimming", "multiply", "color deepening", "linear deepening" and "dark", so that the underlying image to lighten the "light", "filter", "Color Dodge", " Linear dodge "and" light ", increase the contrast of the underlying image" superposition "," soft light "," strong Light "," light "," Point Light "," linear Light "and" solid color mixing ", contrasting the" difference "and" exclusion "of upper and lower layers," hue "," saturation "," Color "and" Brightness. " In which, the second and third groups of layer blending mode is completely opposite, such as "multiply Bottom" is the "color" of the opposite mode. The "strong light" mode adds a high light to the image, while the "dot-light" and "linear Light" modes can add texture to the image with the adjustment of transparency. Hue and color mode add colors to the image.
In order for us to better understand, we will use a pattern to try the way to let you in-depth understanding of the role and function of layer blending mode, and the resulting changes. In this, the focus of the analysis to make the underlying image of the blending mode, before beginning, first of all, do not rely on the underlying image of the "normal" and "dissolved" mode.
The "normal" and "dissolve" modes in a layer's blending mode do not depend on other layers. Normal mode is the default mode for Photoshop, where the resultant color or shaded image does not use the additive subtraction attribute of the color. The "dissolution" mode will produce an unknown result, alternating with the underlying original color to create an effect similar to the diffusion jitter, which is randomly generated. The lower the opacity of a color or image sample is usually used in "dissolve" mode, the higher the frequency of the color or image sample jitter with the original image pixel. They do not belong to the common pattern, you can understand.
Cut to the chase, in the image using the "brighten", "Filter Color", "Color Dodge", "linear dodge" and "Light" mode mixed, its black will disappear completely, any area brighter than black may highlight the following image. Now, let's take a look at how the layer blending mode works:
Open Photoshop to create a new grayscale-mode square document. Open the Gradient tool on the toolbox, and in the Gradient Editor dialog box that pops up, select black and white gradient and set the smoothness value to "0%", as shown in Figure 1.
Figure 1 Setting the gradient editor
Stretch the black and white gradient from left to right on the new document, and view the histogram, as shown in Figure 2. It's interesting to compare the histogram of smoothness 100% and 0%.
Figure 2 Black and white gradient effect and histogram display open the Layers panel, copy the "background" layer, get the "background copy" layer and rotate clockwise 90 degrees, as shown in Figure 3
Figure 3 Copy layer and rotate direction
Underneath the open Layers panel, by pressing the "Create new fill or adjust Layer" button, select the "Hue Separation" command in the menu, and set the "level" value to "10" in the Pop-up Tone separation dialog box, 10 levels of stripes appear, as shown in Figure 4
Figure 4 Tint Separation grayscale image
According to the formation of the above color-level model to understand the basis of the layer blending mode, the following step-by-step to make the bottom of the image to brighten several modes of in-depth analysis.
1, "lighten" mode
View the color information in the layer, automatically detect the color information for the red, green, and blue three channels, and select a lighter color in the base or blend color as the result color. pixels darker than the blend color are replaced, and pixels that are brighter than the blend color remain unchanged. You can turn off the open background copy layer (blend color) and the background layer (base color) to compare its changes, as shown in Figure 5
Figure 5 The result color of the "lighten" mode