until you merge layers or save in picture as .jpg
There are many resources and websites that offer information about Photoshop layers. Some of these websites that offer information are Adobe, Photoshop Essentials and Photoshop Cafe.
Photoshop layers may not import into After Effects if the file format is not compatible or if the layers are not properly organized in Photoshop. Make sure to save the Photoshop file in a format that After Effects supports, such as PSD or TIFF, and ensure that the layers are named and organized correctly for easy import.
You don't need to use an adjustment layer, an adjustment layer will effect any layers that are under that layer, and you may not want to affect all layers, just one. An adjustment layer is good for non-destructive editing, because it can be easily turned on or off, or deleted without making any permanent changes to the pixels of the lower layers. You can also mask out certain parts of the adjustment layer by adding a layer mask so that it will only affect a selected area, but remember, it will still affect all layers under the first one, which may not be preferable if the layers have any transparency.
To add colored lighting in Photoshop, you can use the "Gradient Map" adjustment layer. First, create a new adjustment layer by clicking on the "Create new fill or adjustment layer" icon at the bottom of the Layers panel and selecting "Gradient Map." Then, choose a gradient that represents the colors you want to use for the lighting effect. Adjust the blending mode and opacity of the layer to fine-tune the effect.
color layers is simply color layers
Open the Layers window.
Adjustment layers calculate or show you only preview how image will look if you decide to export it with applied adjustment. When using Adjustment layers you are not working with pixels and everything can be changed at any time till image is in PSD format (or layered TIFF). You can change Adjustment later or even delete it without affecting pixels in image in other words same as nothing was happen.
Yes, .psd files maintain the layers you create in Photoshop so that the next time you open your .psd file in Photoshop you can continue to work directly onto the layers.
One layer.
To store image parts.
To select all layers in photoshop for a PC open up your layers window (It is under window - layers), hold down the shift key and click on each layer that you want to group together or edit.
One way is to create clipping mask. First create layer with adjustment you want to apply to several layers on top of last layer of group you want to change, then select all layers you want to apply that adjustment by holding Ctrl while clicking layer one by one, then navigate kursor at line when adjustment layer touch layer below (last layer of group you want to change), hold down Alt key and cursor will change to little triangle with two squares behind, then click left mouse button and you will create clipping mask, adjustment layer will affect only previously selected layers.