Adobe 23101335 User Guide - Page 201
Adding spot colors (Photoshop), About spot colors, Creating spot channels
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ADOBE PHOTOSHOP 6.0 191 User Guide Adding spot colors (Photoshop) Spot colors are special premixed inks used instead of, or in addition to, the process color (CMYK) inks. Each spot color requires its own plate on the press. (Because a varnish requires a separate plate, it is considered a spot color, too.) For information on printing spot color plates, see "Printing color separations" on page 389. If you are planning to print an image with spot colors, you need to create spot channels to store the colors. Note: To export spot channels, save the file in DCS 2.0 format or PDF. (See "Saving files in Photoshop EPS or DCS format (Photoshop)" on page 359.) About spot colors Note the following when working with spot colors: • For spot color graphics that have crisp edges and knock out the underlying image, consider creating the additional artwork in a page-layout or illustration application. • To apply spot color as a tint throughout an image, convert the image to Duotone mode and apply the spot color to one of the duotone plates. You can use up to four spot colors, one per plate. (See "Printing color separations" on page 389.) • The names of the spot colors print on the separations. • Spot colors are overprinted on top of the fully composited image. Each spot color is overprinted in the order it appears in the Channels palette. • You cannot move spot colors above a default channel in the Channels palette except in Multichannel mode. • Spot colors cannot be applied to individual layers. • If you print an image that includes spot color channels to a composite printer, the spot colors print out as extra pages. • You can merge spot channels with color channels, splitting the spot color into its color channel components. Merging spot channels lets you print a single-page proof of your spot color image on a desktop printer. Creating spot channels You can create a new spot channel or convert an existing alpha channel to a spot channel. To create a new spot channel: 1 Choose Window > Show Channels to display the Channels palette. 2 To fill a selected area with a spot color, make or load a selection. 3 Do one of the following to create a channel: • Ctrl-click (Windows) or Command-click (Mac OS) the New Channel button ( ) in the Channels palette. • Choose New Spot Channel from the Channels palette menu. If you made a selection, that area is filled with the currently specified spot color.
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