Adobe ADBCD17648MC Manuale Utente

USING PHOTOSHOP ELEMENTS 8
Color and tonal correction

Specify the gradient fill you want to use:

•

To choose from a list of gradient fills, click the triangle to the right of the gradient fill displayed in the Gradient Map 
dialog box. Click to select the desired gradient fill, and then click in a blank area of the dialog box to dismiss the list.

•

To edit the gradient fill currently displayed in the Gradient Map dialog box, click the gradient fill. Then modify the 
existing gradient fill or create a new gradient fill.

By default, the shadows, midtones, and highlights of the image are mapped respectively to the starting (left) color, 
midpoint, and ending (right) color of the gradient fill.

Select neither, one, or both of the Gradient Options:

•

Dither adds random noise to smooth the appearance of the gradient fill and reduce banding effects.

•

Reverse switches the direction of the gradient fill, reversing the gradient map.

Click OK.

The Invert filter inverts the colors in an image. You might use this command to make a positive black-and-white image 
negative or to make a positive from a scanned black-and-white negative. 

When you invert an image, the brightness value of each pixel is converted into the inverse value on the 256-step color-
values scale. For example, a pixel in a positive image with a value of 255 is changed to 0.

Select an image, layer, or area.

Choose Filter

  > Adjustments

  > Invert.

The Posterize filter lets you specify the number of tonal levels (or brightness values) for each channel in an image and 
then maps pixels to the closest matching level. For example, choosing two tonal levels in an RGB image gives six colors, 
two for red, two for green, and two for blue.

This command is useful for creating special effects, such as large, flat areas in a photograph. Its effects are most evident 
when you reduce the number of gray levels in a grayscale image. But it also produces interesting effects in color images.