One of the most used items in the node editor is what allows you to merge or combine two images: Node “MIX”.
With this node you mix a base image (connected to the input of the upper), a second image (bottom entry), operating on individual pixels and corresponding in the two images. The way it produces the output image is determined by the option checked in the dropdown menu.
To add a blend node select:
Add->Color->Mix
Size (output resolution) the image produced by the joining node is the size of the base image. The alpha transparency value and channels “The” mix well.
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 Snowman Snow |
We will use previous images to illustrate the way in which the node acts “Mix”. To do this we will need two input nodes with images, node “Mix” and a viewer where we can see the result in each case study:
Importantly, the overall result will be different depending on which is the base image and which the secondary, which is determined by the order of the node connection Mix (upper or lower connector yellow).
The value “Fac” factor indicates the mixture of the two images. This can be defined by a picture or a map of values, such as a mask or a depth map.
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| The connection sequence determines which image is the base and which is superimposed | |
Image blending options
There are sixteen total mixing options:
Mix: Mixture
The background pixel is covered by the foreground with alpha values.
Color MIX : Mix
Add: Add
The pixels are added. Fac. controls the amount of the second shot to add image. It offers a brilliant result. The result is opposite to subtract mode “subtract”.
Color MIX : Add
Subtract: Subtract
The pixel values are subtracted from each. A result of the dark.
It can be considered as opposed to adding “Add”.
Color MIX : Subtract
Multiply: Multiply
Returns a result darker than either of the pixels in most cases (except one of them is equal to white = 1). Completely white layers do not change them substantively. The black layers give black result. In this case we can say that is opposite screen mode “Screen”.
Color MIX : Multiply
Screen: Screen
The pixel values are inverted and multiplied by itself, the result is again reversed. This returns a brighter than the input pixels in most cases (except one of them is equal to 0). The black layers do not change the background (vice versa) – completely white layers give white result.
“Opposite” Multiply mode “Multiply”.
Color MIX : Screen
Overlay: Superposition
A combination of display mode and Multiply mode, depending on the base color.
Color MIX : Overlay
Divide: Divide
The background pixel (top connector) is divided by the second image: if it is white (= 1,0), the first is not changed, the darker the second, brighter the result (division by 0,5 – Medium gray ! – is the same as multiplying by 2,0), if the second is black (= 0.0, since division by zero is impossible), Blender no change el pixels fund.
Color MIX : Divide
Difference: Difference
The pixels are subtracted from each, and the absolute value (the possible values are negative). So, the result shows the distance between the two parameters, black for matching colors, white to opposite colors (one is black, other white). The result looks a bit odd in many cases.
This mode can be used to invest part of the base image, and to compare two images (black results if they are equal), such as a mask for extracting an image.
Color MIX : Difference
Darken: Obscure
The pixels are compared with each other and selects the smallest value. Completely white layers do not change the background color, color and black layers give black result.
Color MIX : Darken
Lighten: Lighten
Both parameters are compared with each other and take the most. black color layers do not change the image and the white layers give white result.
Color MIX : Lighten
Dodge: Dodge
Operation is performed between the brightness of the image based on the gradient (variation) in the other. The results are seen in the lighter areas of the image where the slope is whiter. Use the Fac. to control the amount of the slope affecting the operation.
Color MIX : Dodge
Burn: Burn
Darken a pixel based on the gradient of another lighting. It results makes the picture darker.
Color MIX : Burn
Color: Color
Adds color to each pixel, staining the whole with the color of the second image. Use this option to increase the tone of an image.
Color MIX : Color
Value: Valor HSV
The RGB values of the pixels are converted to HSV values. Both pixel values are mixed, and the hue and saturation of the base image is combined with the value of the image used for the mixture and converted back to RGB.
Color MIX : Value
Saturation: HSV Saturation
The RGB values of the pixels are converted to HSV values. The saturation of the pixel is mixed, and hue and value of the base image is combined with the saturation of mixed and subsequently converted back to RGB format.
Color MIX : Saturation
Hue: Color HSV
The RGB values of the pixels are converted to HSV values. Both pixel tone mix, and the value and saturation of the base image is combined with mixed color and is converted back to RGB format.
Color MIX : Hue
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