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Re: Constructed maps ( CHAT)

From:Mark J. Reed <markjreed@...>
Date:Friday, June 22, 2007, 18:15
On 6/22/07, Roger Mills <rfmilly@...> wrote:
> > A vector graphics program combined with a pixel graphics > > program should be a great help. > > Hmm, yes, if I had more than a fleeting idea what those terms meant
Well, here's my shot at a quick explanation: You probably already know that an image is displayed on a computer screen as an array of tiny dots (called picture elements or pixels), each of which can be a different color. A "pixel" (or "raster") graphics program stores the image exactly the same way: as a collection of colored dots. Which is fine when the dots in the image map one-to-one to the ones on the display. If you try to make the picture bigger, though (for instance, to print it out - a printed picture usually has a lot more dots than one on the screen), you just end up with bigger dots. The extreme result of this scort of scaling-up is the "pixelation" effect frequently used to obscure things on TV. In contrast, a vector graphics program stores a mathematical representation of the lines and other figures (curves, ellipses) instead. Vector graphics scale indefinitely - the more dots, the closer the drawn lines are to the mathematical ideal. But constructing the images is different - a digital camera isn't going to calculate the equations of all the lines and curves in a scene. Usually vector graphic images are created with a diagramming/drawing application like Visio. Postscript and PDF are fundamentally vector-based descriptions of the printed page, although you can embed pixel-based imagery as well. Formats like JPEG and GIF are wholly pixel-based. PNG is usually pixel-based but I think it has a subformat for vector images as well. -- Mark J. Reed <markjreed@...>