If all your document contains is the Background, then you should be able to save the image in just about any file format without losing information. In fact, that's the whole reason why the Background image exists.
The Background image has the same limitations as most of the common file formats in use today (such as JPEG and EPS): it's always 100% opaque, no part of the background can extend beyond the document's bounds, and it's not actually considered a layer since most file formats don't support layers (with a few exceptions such as. It might be the same size and it relates to the other pages in the pad, but it has some qualities that make it quite different. If you liken the layers to the individual pages in a pad of tracing paper, you could think of the pad's cardboard backing as the Background image. The Background image in Photoshop (which some people refer to as the Background layer) is a bit different than the other layers that make up your image. You can even change it to solid white by changing the Grid Size setting to None. You can change the checkerboard's appearance by choosing Edit > Preferences > Transparency & Gamut. If you'd rather make all the layers visible, Control-click (Mac) or right-click (Windows) on the eyeball icon and choose Show/Hide All Other Layers. Option or Alt-clicking a second time will bring those same layers back into view. To quickly turn off all the eyeballs in the Layers palette and view only the layer you're interested in, simply Option-click (Mac) or Alt-click (Windows) one of the eyeball icons. Just changing the layer's name back to "Background" will not do the job. If your document doesn't have a background (because you accidentally deleted or renamed the background), you can convert one of the existing layers into a background by choosing Layer > New > Background from Layer. To change this, you can reorder the layers by dragging them up or down in the Layers palette ( Figures 3.7 to 3.10). The topmost layers can often obstruct your view of the underlying images. You can change the stacking order of the layers by dragging the name of one layer above or below the name of another layer in the Layers palette. Unlike previous versions, Photoshop CS2 allows you to have more than one layer active at a time, but for now we'll stick to working with one layer to keep things simple. As you Command/Ctrl-click on different parts of your image (circle, square, triangle in this example), watch the Layers palette to see which layer becomes active. That will cause the topmost layer that contains information under your cursor to become active. Or, if you'd rather not use the Layers palette, Command-click (Mac) or Ctrl-click (Windows) on your image while the Move tool is active. To change the active layer, just click the name of another layer. The layer you're currently working on will be highlighted in the Layers palette. I like working with a safety net, so before using these tools, I create a new layer where I can easily edit the changes without disturbing the underlying image. Because these tools apply changes directly to the active layer, the changes are difficult to modify once they've been applied. I often create a new layer before using any of the painting tools or the Gradient tool.
You can use this simple document you've just created to try out the concepts in the following sections that describe the features of the Layers palette ( Figure 3.6). Finally, create a third layer and draw a triangle ( Figure 3.5) with yet another color (create the triangle by using the Polygon Shape tool with the Sides setting to 3 in the Options bar).
Once you're done with the first shape, create another layer and use the Rectangle Shape tool to draw a square on it, but with a different color ( Figure 3.4). Now, click and drag across your image to draw a big circle ( Figure 3.3). Next, click on your foreground color and pick out a bright color, choose the round Shape tool (it's called an Ellipse and is grouped with the Rectangle Shape tool found below the Type tool in the Tools palette) and click on the rightmost icon of the three available in the upper left of the Options bar. Then, click the New Layer icon at the bottom of the Layers palette to create an empty layer. The only time that won't work is when the Background is active-Photoshop can't add a new layer below the Background.Ĭhoose File>New and create a document that is around 200 x 200 pixels in size with a transparent background (the resolution doesn't matter at this point). If you hold the Command key (Mac) or Ctrl key (Windows) when clicking the New Layer icon, the new layer will appear below the active layer instead of on top of it.
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