Who can specifically talk about the layer overlay mode in PS?

1. Normal mode-This is the default mode of layer blending mode, which is commonly used. Do not mix with other layers. When used, lower colors are covered with the colors of pixels in the current layer.

Because color is regarded as light (not physical pigment) in PhotoShop, the subtraction attribute of color will not be used in the composite or color works formed in normal mode. For example, in normal mode, the 50% opaque blue selection above the 100% opaque red selection will produce lavender instead of the deep purple expected when mixing physical pigments. When the opacity of the blue selection increases, the generated color becomes bluer and less red, and blue becomes the color of the combined color until the opacity is 100%. Paint blue on the red area with 50% opacity with brush I, and the result is the same; The more you draw on the red area, the more the blue foreground color becomes the final color of the area. Therefore, in the normal mode, it is impossible to obtain a mixed color that is darker than the darkest color among the two mixed color components.

2. Dissolution mode-The pixel color generated by dissolution mode comes from a random replacement value of the upper and lower mixed colors, which is related to the opacity of the pixel. When the target layer image is superimposed on the bottom layer image in the form of scattered points, it will not have any influence on the color of the image. By adjusting the opacity, the density of scattered points in the target layer can be increased or decreased. The result is usually a grainy picture or a rough line edge.

When the dissolution mode is defined as the mixing mode of layers, it will produce unpredictable results. Therefore, this mode is best used with the shadow application tool in Photoshop. The U 1ssQlve mode uses 100% opaque foreground color (or sampled pixels when used with the rubber stamp tool) to alternate with the underlying original color to create an effect similar to diffusion jitter. The lower the opacity of the color or image sample usually used in the "fusion" mode, the lower the frequency at which the color or proof is dispersed with the pixels of the original image. If the path is traced with opacity less than or equal to 50%, Dissolve mode creates a stripe around the edge of the image. This effect is very important to simulate the edge of damaged paper or the "splash" type of the original picture.

3. Dimming mode-This mode is to compare the RGB values of two layers (i.e. the color brightness values in the RGB channels) when mixing the colors of pixels, and then take the lower value of the two layers to combine them into mixed colors, so that the gray level of the total color is reduced and the darkening effect is produced. Obviously, it is ineffective to synthesize images with white. Check the color information of each channel and the mixed pixel color, and select the darker one as the mixed result. Brighter pixels will be replaced by darker pixels, and the darker pixels will not change.

In this mode, only tones on layers whose colors (or colors applied in dark mode) are darker than the background color are used. This mode removes colors brighter than the background color from the composite image.

4. Multiply mode-positive superposition mode. The color information in each channel is investigated, and the background color is positively superimposed. Its principle is the same as the "subtractive principle" in color mode. The color produced by this mixture is always darker than the original color. If there is a positive overlap with black, only black is produced. And mixing it with white won't have any effect on the original color. Multiply the gray levels of the upper and lower pixel colors to get the color with lower gray level, which becomes the composite color. The effect of layer composition is simply that pixels with low gray level appear and pixels with high gray level do not appear (that is, dark color appears and light color does not appear), resulting in an effect similar to positive film superposition. (Note: the black gray scale is 0, and the white gray scale is 255)

This pattern can be used for coloring and as a pattern for image layers. Multi-mode subtracts the brightness value of the source material from the background image (whether it is colored or placed on the layer) to obtain the final composite pixel color. Applying lighter colors in multi-mode has no effect on the final pixel color of the image. Multi-mode is very popular to simulate shadows. Shadows in reality never depict a brighter color or hue than the source material (shadow) or the background (the area where the shadow is obtained). In this chapter, users will use multiple modes to add drop-down shadows to Lee in the restored image.

5. Color deepening mode-When using this mode, the color value of the layer will be darkened, and the brighter the added color, the more delicate the effect will be. Darkening the color of the bottom layer is similar to positive overlay, but the difference is that the contrast of the bottom layer will be increased according to the superimposed pixel color. Mixing with white has no effect.

The effect of this color deepening mode is similar to that of multi-mode creation, except that the brighter areas on the background disappear and the image areas show clear edge features.

6. Linear deepening mode-Similar to positive superposition, the background color is darkened by reducing brightness to reflect the mixed color. Mixing with white has no effect.