Detailed explanation of photoshop calculation command?

The calculation command is to calculate the gray values of the corresponding pixels in two channels according to a certain mathematical formula, and save the results to the target channel or a new channel. The calculation method is determined by the specified mixing mode. When executing the calculation command, it should be noted that the size of the source image must be the same as the size of the target image, otherwise it cannot be synthesized. The source image and the target image can be different channels of the same image or different layers in the same hierarchical file. The synthesis effect of two or more images can be achieved by executing the calculation command, but the mixed image is a gray image and can also be used as an alpha channel or a selection. The options in the dialog box can only be color channel, alpha channel and gray channel.

Before executing the calculation command, you need to be familiar with the effects of various mixing modes.

The greatest value of the calculation command is that it provides a powerful and accurate selection method, which is different from the selection method in the toolbox. It adopts the attributes of the pixel itself (such as brightness, hue, saturation, etc. ) as a starting point, the choice of pixels is determined through a series of certain ways, and this choice is expressed in the form of channel images, and finally the images are processed in the form of selection.

The mixed mode of addition and subtraction is only available when calculating and applying image commands. The addition mode can increase the pixel values in two channels, and the subtraction mode can subtract the pixel values in the source channel from the corresponding pixels in the target channel.

The Calculation Command dialog box is divided into four parts. Source one, source two, mixing and result.

Where the source 1 and the source 2 are separate channels or gray-scale combined channels from open files, which are used as target objects for setting and participating in mixing.

The blending option is used to set the blending mode of the source 1 and the source 2, where the opacity option controls the strength of the calculation command and the opacity of the objects in the source 1.

You can set the calculation result in the drop-down list of the result option.