Adobe photoshop elements 2 Manual Do Utilizador

CHAPTER 4

To make adjustments to a portion of your 
image, make a selection in the document 
window. (See “Selecting pixels” on page 114.)

Do one of the following:

Choose Enhance > Adjust Brightness/
Contrast > Brightness/Contrast.

Create a new Brightness/Contrast adjustment 
layer, or open an existing Brightness/Contrast 
adjustment layer. (See “Using adjustment and 
fill layers” on page 101.)

Drag the sliders to adjust the brightness and 

contrast.

Dragging to the left decreases the level; dragging to 
the right increases it. The number at the right of 
each slider value displays the brightness or 
contrast value. Values range from –100 to +100. 

Click OK.

The human eye perceives color in terms of three 
characteristics—hue, saturation, and brightness 
(HSB), while computer monitors display colors by 
generating varying amounts of red, green, and 
blue (RGB) light. Photoshop Elements lets you use 
the HSB and RGB color models to select and 
manipulate color.

Based on the human perception of color, the HSB 
model describes three fundamental characteristics 
of color: 

Hue is the color reflected from or transmitted 
through an object. It is measured as a location 

on the standard color wheel, expressed as a 
degree between 0 and 360. In common use, hue 
is identified by the name of the color such as red, 
orange, or green.

Saturation, sometimes called chroma, is the 
strength or purity of the color. Saturation repre-
sents the amount of gray in proportion to the 
hue, measured as a percentage from 0 (gray) to 
100 (fully saturated). On the standard color 
wheel, saturation increases from the center to 
the edge.

Brightness is the relative lightness or darkness of 
the color, usually measured as a percentage from 
0 (black) to 100 (white).

Although you can use the HSB model in 
Photoshop Elements to define a color in the Color 
Picker dialog box, there is no HSB mode available 
for creating and editing images.

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