What is the role of computing in photoshop images?

The "Calculate" command is a processing factory, its raw materials are various choices (selection, mask, channel), products are new channels (documents, selection), and the mixed mode is production line. The same raw materials are sent to different production lines to produce different products.

What can't replace the Apply Image command with the current layer function? Namely "addition" and "subtraction".

It is very difficult to give consideration to details and contrast in the "Calculate" command, because taking care of details is the first priority, and the contrast adjustment in the layer is much more flexible.

In the application image, the compensation value of the "addition" blending mode is set to "-128" to ensure that the blended highlights will not exceed the brightness of the original image and will not be reflected.

Structure of the Calculation Command dialog box:

Source 1: indicates mixed color.

Source 2: stands for primary colors.

Blending: indicates the result color.

Layer: The source can be different images, and the only restriction is that the two computed images must have the same size. If the two images are different in size, consider dragging one into the other.

Channel; one passage

Source can be a different form of choice, except "red"

green

Besides the blue channel, there is also a gray channel. If the document has a selection, the selection will also appear as a channel in the Channel drop-down menu of the Calculation Command dialog box. If there are graphics in the layer,

Layer mask, this layer mask will also appear in the channel drop-down menu of this layer. If there is a normal layer in the document, a channel named "transparent" will appear under its "channel" option, which represents the diagram.

Opacity of the layer; The greater the opacity, the brighter and darker the channel.

Several ways to get channels:

1. You can get a black channel by clicking "Create a new channel" in the channel panel.

2. You can save the selection in the document as a channel through the "Save Selection" command in the "Select" menu.

You can get a new channel by copying the existing channel.

4. Mix two existing channels with the "Calculate" command to get a new channel.

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