To change a selection marquee into a path, with the path
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onscreen, click the Make Work Path From Selection icon on the bottom of the Paths panel The path created is a rough approximation of the selection marquee and you ll almost certainly want to edit it after creating and saving the Work Path If you hold ALT/OPT while clicking
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Path Selection tool Selects an entire path for repositioning When you re working on a path (or it s simply selected), you can move it by pressing CTRL/CMD+A to select the entire path and then using the Direct Selection tool to move it; the Path Selection tool becomes unnecessary
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this button, you can choose a Tolerance, an amount of fidelity with which Photoshop traces your active marquee selection as a path The default value is 2 pixels
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Photoshop CS4 QuickSteps to Making Selections PC QuickSteps Getting Know Your PC
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Working with Transparency Use the Layers Panel Create New Layers Linking and Unlinking Layers Edit with Layers Manipulating Layer Groups Create a Layer Group Flattening an Image Merge a Layer with the Layer Beneath It Merge Linked Layers Merge Visible Layers Checking File Size Using the Masks Panel Create Layer Masks Editing a Mask Masking a Layer Group Work with Clipping Masks Work with Opacity and Fill Adjust Layer Opacity or Fill
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Editing Layers and Selections
Layers and layer masks are the key to creating advanced effects, such as replacing backgrounds, combining photos, and making collages They allow you to build complex compositions while still maintaining control of the individual elements Better yet, they allow you to keep all your assets intact so you can change how you use them later Think of layers as a combination of photographs and overhead transparencies that can be stacked up, one on top of the other, almost indefinitely You can use a layer mask to hide all or part of a layer and then vary a layer s opacity to achieve the desired effect You can use layer styles to create drop shadows and other effects
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Photoshop CS4 QuickSteps
Editing Layers and Selections
WORKING WITH TRANSPARENCY
One of the big advantages of working with a stack of layers is that you can make all or parts of layers transparent, thereby revealing or hiding the images they contain In this way, you build up an image, layer by layer See Work
Work with Layers
As you work with an image, making changes to it, you can make the changes to other layers instead of to the original image, which is thereby protected from being altered as you experiment and edit the new image you re trying to create This is referred to as nondestructive editing Only when you merge the layers into one is the image permanently altered As long as you retain the layers, you can always return to the original image There are several kinds of layers that you may be working with:
with Opacity and Fill and Work with Layer Masks in this chapter to see how to use these tools to create and control transparency when you create layered images
When working on documents with multiple layers, you often need to temporarily hide individual layers By doing so, you avoid having to sort through layers that are crucial to the document but that do not currently need editing To hide a layer so that you can see only the visible layers, click the eye icon at the far left of the layer thumbnail in the Layers panel The icon disappears and the
Background layer The original image containing the contents to be altered It is always on the bottom of the stack of layers You cannot change the opacity or blend mode of a background layer You can, however, convert a background layer into a regular layer or make a copy of it, and then you can modify it and move it in the stack Adjustment layer A layer that changes the layers beneath it with color or tonal alternations, but without changing the actual pixels of the image layer Unlike the background layer or another image layer, the adjustment layer doesn t contain recognizable image contents Rather, it contains color or tonal changes The adjustment layer is a mask that you paint on using black, white, and shades in between to hide or reveal the effect attributed to the adjustment layer Fill layer Fills a layer with a solid, gradient, or patterned fill The fill layer itself contains the color, unlike the adjustment layer, which modifies other layers beneath it Layer group A group of linked layers By linking several image elements, you can treat them as a single element An image can be made up of several layer groups Masked layer Enables you to paint a selection, or mask, that alters the image by blocking out parts of the image or partially revealing the image (making it more or less transparent) Clipping mask A layer beneath another layer whose nontransparent regions determine what is visible on the layer above it It is a nondestructive arrangement and produces effects visually similar to looking at an image through a cut-out stencil
layer is hidden To reveal a hidden layer, click the empty space at the far left of the layer thumbnail in the Layers panel The eye icon reappears