Publishers of technology books, eBooks, and videos for creative people

Home > Articles > Design

This chapter is from the book

This chapter is from the book

Thou Shalt Know Thy Bits and Pieces

Bitmaps and vectors, photographs and graphics—the most fundamental concepts in computer graphics are no place for fuzzy thinking or you can ruin a great layout. A bitmap image, like a TIFF, consists of rows of dots or pixels, having a fixed resolution, measured in pixels per inch (ppi) and output to dots per inch (dpi). By contrast, vectors, like a "true" EPS, or drawn objects, have no resolution. They're just a set of instructions and the quality is determined on output by the resolution of the printer. An EPS from Illustrator, Freehand, or CorelDRAW can be scaled to any percent in Quark, big or small, and it's fine. But scale a TIFF image in Quark to 200%—a 300ppi resolution drops to half (150ppi)! As for the faux EPS—if it looks like a photo, it's a bitmap, whether or not the label says EPS—buyer beware! And if it's a real EPS but has an imported bitmap within, the same rules apply.

Figure 6.9Figure 6.9

  • + Share This
  • 🔖 Save To Your Account