Adobe Creative Suite 2 CLASSROOM IN A BOOK [Electronic resources] نسخه متنی

When is it a good idea to downsample an image?

What are the advantages of using a duotone instead of simply converting an image to grayscale?

How can you check out the different character sets and alternate glyphs of an OpenType font?

How do you find the different Libraries in Illustrator?

How do you map artwork to the surface of a 3D object in Illustrator?

Downsampling, which means to reduce the number of pixels used to define an image, is especially useful when moving from print to Web. For a good quality print, an image with 250 dpi or more is needed, but for viewing on screen a lower resolution of 72 ppi is sufficient and the file size can be reduced by downsampling the image. Important to understand is that downsampling reduces the information (pixels) stored in an image. You cannot recover this lost information once the image has been downsampled.

A duotone, a color photograph printed in only two colors, has a greater tonal range than a grayscale image, which is printed in just one color. While a Photoshop image can contain 256 levels of gray, a printing press might reproduce as few as 50 levels of gray per ink. The additional color information of the two inks of the duotone adds more depth to the image, and makes its appearance less coarse. In the example of the wine label the duotone provides a richer background than just a grayscale image, picking up key tones in the center of the image. Duotones in sepia colors often evoke often an impression of past-time photographyand for the wine label this conveys the quality of an old, noble product.

The Glyphs palette displays all the characters and character variants included in an OpenType font, given that the font design has been provided with them.

To open the Glyphs palette in InDesign, you choose Type > Glyphs or Window > Type & Tables > Glyphs. In Illustrator, choose Type > Glyphs. Photoshop has access to the OpenType features if you select Window > Character, but it does not offer a Glyphs palette.

Illustrator comes with a wide variety of preset brushes, graphic styles, swatches and symbols. To view the different libraries, choose Window, and select Brush Libraries, Graphic Style Libraries, Swatch Libraries or Symbol Libraries.

To map artwork to a 3D object, add the image you want to use to the Symbols palette, select the 3D object, and double-click 3D Revolve in the Appearance palette to open the 3D Options dialog box. Click the Map Art button. Select the Surface to map the artwork to, and then choose the image from the Symbol pop-up menu. The image can then be positioned and scaled on the selected Surface in the Map Art dialog.