![]() DPI is dots per inch, and is used for printing. PPI means pixels or points per inch, depending. Since equation a equals equation a, they scale beautifully, but you lose color control. ![]() Basically, the program figures out the equation of the line you drew. The disadvantage of this is Raster images don't scale well. Think of it like filling in squares on graph paper. Raster based programs can be thought of as grids- each point is assigned a different color/value/translucency/whatever. Okay, so there are two different types of graphics programs, raster and vector.
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