A digitizing tablet is an input device that enables you to enter drawings and sketches into a computer. A digitizing tablet consists of an electronic tablet and a cursor or pen. A cursor (also called a puck) is similar to a mouse, except that it has a window with cross hairs for pinpoint placement, and it can have as many as 16 buttons.
A pen (also called a stylus) looks like a simple ballpoint pen but uses an electronic head instead of ink. The tablet contains electronics that enable it to detect movement of the cursor or pen and translate the movements into digital signals that it sends to the computer. For digitizing tablets, each point on the tablet represents a point on the display screen in a fixed manner. The static nature of digitizing tablets makes them particularly effective for tracing drawings. Most modern digitizing tablets also support a mouse emulation mode, in which the pen or cursor acts like a mouse.
Embroidery digitizing, is the art of using a computer to convert artwork into data that is recognizable by an embroidery machine. This tells the machine how to stitch the logo. One click on the computer does not automatically convert the design. The artist redraws the design in such a way that the embroidery machine knows what to do; from the size of the design, to underlay, type of stitch, color changes, and the order in which this all takes place. Very similar to an architectural blueprint that tells the builder what to do.
Technically, digitizing refers to the process of converting analog information into digital information. For example, scanning a photo into the computer is a form of digitizing. As it relates to embroidery, it is the process of preparing artwork and applying stitches to create a digital embroidery file suitable for use on a computerized embroidery machine.
Complexity is the biggest factor. A large circle that is all fill makes the stitch count very high, but the design is simple. A large circle that has a complex design inside, but is not completely filled has a lower stitch count, but is much more time consuming to digitize.
Not all designs or logos are embroidery friendly because, more often than not, they were originally designed for print. With print, letters can be much smaller and colors can be incorporated into each other more fluidly than with embroidery. Therefore, sometimes modifications must be made to the size and /or layout of lettering, logo, or design to achieve the best results (with your approval of course).