The retouching techniques you apply to an image depend in part on how you will use the image. Whether an image is intended for black-and-white publication on newsprint or for full-color Internet distribution affects everything from the resolution of the initial scan to the type of tonal range and color correction that the image requires. Photoshop supports the CMYK color mode for preparing an image to be printed using process colors, as well as RGB and other color modes. ImageReady supports only RGB mode, used for on-screen display.
To illustrate one application of retouching techniques, this lesson takes you through the steps of correcting a photograph intended for four-color print publication.
For more information about CMYK and RGB color modes, see Lesson 18, "Producing and Printing Consistent Color."
Original image Image cropped and Image placed into page layout retouched
For the Web: The printed page versus on-screen display
Although you can create publications for both paper and on-screen use, remember that a computer screen and a printed page are very different. Keep these differences in mind when you create publications for either medium—or for both media:
• Text can be small and still very legible on paper, because the dots of ink on paper are much finer than the dots of light used in a monitor. Therefore, avoid small text and finely detailed graphics on-screen. This means that it is more difficult to effectively use formatting such as multiple columns on-screen.
• Computer monitors come in all sizes, and you can rarely guarantee that your online readers all have the same monitor size. You should design for the smallest monitor you expect people to have—typically a 15-inch monitor. By contrast, when you print to paper, you know what size the paper is and can design the publication accordingly. However, a page in an HTML or PDF publication can be any length.
• The larger dimension of a computer screen is horizontal ("landscape"), while in most printed pages, the larger one is vertical ("portrait"). This fact fundamentally affects the format of your pages.
• A printed publication is usually read sequentially—even to flip through the publication the reader must turn from one page to the next. In an online publication, the reader can go anywhere any time, either by indicating what page to go to or by clicking on a link that goes to somewhere else, such as to an entirely different publication.
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