Tài liệu 3D Game Programming All in One- P14 doc

Straight Airbrush Lines

We can restrict the movement of our airbrush in order to make consistent lines, by doing

the following:

1. Click the image where you want the line to begin.

2. Press and hold the Shift key.

3. Click the image where you want to end the line (press the right mouse button to

use the background color).

4. Keep adding line segments of either color by clicking with the left or right mouse

button.

5. Release the Shift key to end the line.

Clone Brush

The Clone Brush is the eighth tool from the top of the Tool palette. Use the Clone Brush

to copy part of an image to another location. You can clone within an image, between

bitmap layers, or between two grayscale or 24-bit color images. For example, if a photo￾graph has a flaw against a multitoned or multicolored background, such as skin or cloth,

you can use the Clone Brush to copy the background over the flaw.

When you use the Clone Brush, you work with two image areas: the source area, which is

the area you copy from; and the destination (or target) area, which is the area you copy to.

The destination can be within the same image or in another image of equal color depth.

Clone Brush Options

The Clone Brush shares many options with the other brushes. However, one option is

unique to the Clone Brush and has a big effect on how it operates: the Aligned Mode option.

With this option enabled, the source area moves with the brush each time you release the

mouse button. When you release and then reclick the mouse button, the brush resumes

cloning the image relative to the distance from the source area.

With this option disabled, the source area does not move when you release the mouse but￾ton. Each time you release and then reclick the mouse button, the starting point for

cloning returns to the source area.

There is also the Sample Merged option. With this option enabled, the brush will clone all

visible data rather than just the data from the current layer. If not enabled, only the data

on the current layer when the source point was defined is cloned.

tip

When you clone from one image to another, make sure that the two images have the same color

depth before you begin.

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Cloning

To use the Clone Brush, follow this procedure:

1. Position the cursor over the part of the image that you want to copy. Set the source

area by right-clicking the source area once. Your computer beeps to indicate that

you have selected the source area.

2. To place the cloned image on a specific layer or in a selection, select that layer or

area now. Paint Shop Pro only clones within the selection.

3. Move the cursor to the area to which you want to start copying the image. This can

be within the same image or in another image of the same color depth.

4. Press and hold the left mouse button to make the crosshairs appear over the source

area to indicate which pixel you are copying.

5. Drag the mouse to clone from the source area to the destination area.

6. Release the mouse button to end the brush stroke.

7. To resume cloning, start over at step 5. Remember that the location of the source

area depends on the clone mode.

Eraser

Use the Eraser to replace colors in an image with the background color or with a trans￾parency. When you drag the Eraser across a bitmap layer, all the pixels in its path become

transparent. When used on a background, the Eraser produces a different effect. It acts like

a paintbrush, replacing the existing color with the current foreground or background color.

The Eraser retains the information it has removed from a layer. To restore the erased

image, you can right-click and drag the Eraser over the transparent areas.

To use the Eraser:

1. Activate the Eraser by clicking its button in the Tool palette. (The Eraser is in the

seventh slot from the bottom. Refer back to Figure 8.27.)

2. Use the Tool Options palette to configure the Eraser tip for your needs.

3. Drag the cursor across a layer to erase the color.

Selecting

There are several ways to select things in Paint Shop Pro. When working with bitmap

images on raster layers, you select pixels with one of two tools, Selection or Freehand.

When working with vector layers, you select objects with the Vector Object Selection tool.

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Selection Tool

Use the Selection tool to create a selection in a specific preset shape. The Selection tool is

located in the fifth slot from the top of the Tool palette (refer back to Figure 8.27). As with

other tools, you have a range of tool options to use (see Table 8.4).

To make a selection:

1. Click the Selection button on the Tool palette.

2. Place the cursor on the image.

tip

To create a rectangular, square, or rounded rectangular or square selection, place the cursor at a

corner of the area you want to select.

To create a circular or elliptical selection, place the cursor at the center of the area you want to

select.

To create a selection using the other shapes, place the cursor at a point that would form the cor￾ner of an imaginary rectangle enclosing the shape.

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Table 8.4 Selection Tool Options

Option Description

Selection Type Choose one of the selection shapes from this drop-down box. Your choices are

rectangle, square, rectangle or square with rounded corners, ellipse, circle, triangle,

pentagon, hexagon, octagon, one of two star shapes, and one of three arrow shapes.

Mode Normally you would use the Selection tool in Replace mode, where each time you use

the tool, you create a new and different selection. You can use Add mode if you want

each selection you make to be added to the previous selection. Remove mode

removes the area of each selection from a previous selection. You will find, however,

that it is probably best to just use Replace mode and press the Shift key to

temporarily invoke Add mode or the Control key to temporarily invoke Remove mode.

Feathering Feathering controls the sharpness of a selection's edges. By fading a set width (in

pixels) along the edges, it produces a smooth transition between a selection and

the surrounding area. The feathering value is the width of the transition area in

pixels. A higher feathering value creates softer edges by feathering more pixels.

Feathering is useful when pasting a selection. The fading helps the selection blend

into the background.

Anti-alias Anti-aliasing is similar to feathering, but more precise. It produces a smooth-edged

selection by partially filling in pixels along the edge, making them semitransparent. If

anti-aliasing is not applied, the edges of a selection can appear jagged. Anti-aliasing

is useful when combining images and when working with text.

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