Can't unlock PS background layer?

#PS background layer cannot be unlocked?

PS If there is only one background layer, it cannot be unlocked. The problem is because the PS file needs to have at least one layer, and this layer can be a background layer or a normal layer. Solution: In the layers panel, create a new layer, so that the background layer will be unblocked and converted into a normal layer.

What are layers?

In layman’s terms, layers are like films containing elements such as text or graphics. They are stacked one on top of another in order to form the final effect of the page. Layers allow precise positioning of elements on the page. Text, pictures, tables, and plug-ins can be added to layers, and layers can also be nested inside.

For example, if you paint on sheets of transparent cellophane, you can see the content on the paper below through the cellophane above, but no matter how you paint on the upper layer, it will not affect the bottom. of cellophane, the upper layer will obscure the image below. Finally, the cellophane is superimposed, and the final composite effect can be changed by moving the relative positions of each layer of cellophane or adding more cellophane.

This is a simple metaphor for the concept of "layers" in Photoshop. The layers of application software such as AUTO CAD can be described with a similar simple metaphor.

Layer composition

Each layer is composed of many pixels, and the layers are stacked up and down to form the entire image. To use an analogy, each layer is like a transparent "glass", and the layer content is drawn on these "glasses". If the "glass" has nothing, it will be a completely transparent and empty layer. When each "glass" has an image, all layers are viewed from top to bottom to form an image display effect. Let's give an example: For example, if we draw a face on paper, we draw the face first, then the eyes and nose, and then the mouth. After finishing the painting, I found that the position of the eyes was a little crooked. Then the only option is to erase the eyes and repaint them, and also make some corresponding repairs to the face. This is of course very inconvenient. The same is true in the design process. It is rare that a work is completed in one go. It often takes several revisions before a satisfactory effect is achieved.

So imagine if we don’t draw directly on the paper, but first lay a layer of transparent plastic film on the paper, and draw the face on this transparent film. After painting, apply a layer of film to paint the eyes. Lay out another sheet and draw the nose. As shown in the picture below, the face, nose, and eyes are divided into three transparent film layers to create the final effect. The finished product is visually identical to the previous one.

Although the visual effect is the same, the layered works are highly modifiable. If you feel that the position of the eyes is wrong, you can move the layer of film where the eyes are located separately to achieve the modification effect. You can even discard the film and paint the eyes again. The rest of the face, nose and other parts are not affected because they are painted on different layers of film. This method greatly improves the convenience of later modifications. Avoid duplication of effort as much as possible. Therefore, it is wise to create images in layers.

The layer is like a transparent "glass", and the layer content is drawn on these "glasses". If the "glass" has nothing, it will be a completely transparent and empty layer. When each "glass" has an image, it is enough to look at all the layers from top to bottom to form an image display effect. There is no need to memorize the concepts, as long as you can understand them.

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