Adobe illustrator 10 Manuale Utente

Pattern applies a halftone-like square pattern to simulate any colors not in the color 

table.

Noise applies a random pattern similar to the Diffusion dither method, but without 

diffusing the pattern across adjacent pixels. No seams appear with the Noise dither 
method. 

Transparency and Matte Select a combination of Transparency and Matte options to 
specify how transparent pixels in the image are optimized:

To make fully transparent pixels transparent and blend partially transparent pixels with 

a color, select Transparency and select a matte color. 

To make all pixels with greater than 50% transparency fully transparent and all pixels 

with 50% or less transparency fully opaque, select Transparency and choose None from 
the Matte menu. 

To fill fully transparent pixels with a color and blend partially transparent pixels with the 

same color, select a matte color and deselect Transparency.

To select a matte color, click the Matte color swatch and select a color in the color picker. 
Alternatively, choose an option from the Matte menu: Eyedropper (to use the color in the 
eyedropper sample box), White, Black, or Other (to use the color picker).

Interlace Select Interlaced to create an image that displays as a low-resolution version in 
a browser while the full image file is downloading. Interlacing can make downloading 
time seem shorter and can assure viewers that downloading is in progress. However, inter-
lacing also increases file size.

Web Snap Specify a tolerance level for shifting colors to the closest Web palette equiva-
lents (and prevent the colors from dithering in a browser). A higher value shifts more 
colors. 

JPEG is the standard format for compressing continuous-tone images such as photo-
graphs. Optimizing an image as a JPEG format relies on lossy compression, which selec-
tively discards data. (See 

Optimization panel for JPEG format 
A. File format menu B. Quality Level menu C. Optimize menu

Quality Choose an option from the Quality Level menu, or specify a value in the Quality 
text box. The higher the Quality setting, the more detail the compression algorithm 
preserves. However, using a high Quality setting results in a larger file size than using a low 
Quality setting. View the optimized image at several quality settings to determine the best 
balance of quality and file size.

C

A

B