Review
- Navigator Pallet/Hand Tool
- JPEG vs. RAW vs. PSD
- Undo vs. History Pallet vs. Revert
- Image Size
- Color Modes
Before You Begin to Edit
- It is always a good idea to keep your original image somewhere secure, as a backup, and work on a copy
- Always convert to .psd first, before beginning any editing
Layers
- Images in Adobe Photoshop are made up of layers. Initially, each image has only one layer (called the background layer), but you can add more layers to the image.
- Layers are very useful for editing images and creating special effects. For example, you could make a copy of a layer and make some changes to it. If you don't like the results, you can delete the layer and still have your original layer as a backup. You can also combine images by putting different content on different layers.
- Note: Keep in mind that layers (except for adjustment layers) require a substantial amount of memory. Photoshop files with large numbers of layers typically are large files.
- To work with layers, display the Layers palette by choosing Layers from the Window menu. The following is an example of the layers palette along with an image.
The first column of the layers palette shows which layers are currently visible, indicate by the eye icon (). In the above example all the layers are visible. You can change a layer's visibility by clicking the eye icon in the first column of the layer
- Note: Even when a layer is visible, part of it may be transparent. For example, this happens if you select part of an area and then press the delete key. When part of a layer is transparent, the layers underneath it can show through.
- You can change the opacity of a layer by entering a value between 0 and 100 in the Opacity field at the top of the layers palette. For example, at an opacity of 10%, the layer would be nearly transparent; at an opacity of 90%, it would be almost completely opaque. The opacity default is 100%.
- Editing you do within Photoshop affects the current layer. In the example above, "Layer 1" is the current layer.
- To make a layer the current layer, click on the layer in the Layers palette.
- To change the name of the layer, double-click on the layer's name, then type in a new name.
To lock (prevent changes to) a layer, click one of the Lock: boxes near the top of the layers palette. From left to right, they are: lock transparent areas, lock pixels (prevent changes to non-transparent areas), lock layer position, and lock all.
Other actions can be performed by clicking on icons at the bottom of the layers palette:
- To link two or more layers, first select them by shift-clicking on them in the layers palette. Then click the link layers icon. When they are linked they move together, so if you reposition a layer you will simpultaneously reposition all layers linked to it.
- To add effects to a layer (for example, shadows), click on the layer styles icon.
- To add an adjustment layer, click the Adjustment layer icon (adjustment layers are discussed below).
- To create a new layer, click the new layer icon at the bottom of the Layers palette, or duplicate a layer by dragging the layer to the new layer icon.
- To delete a layer, click the trash icon, or drag the layer to the trash icon (next to the new layer icon).
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