Thanks, Moose.
I have known for a while what vector meant, relative to raster, but
the detail of the description has always eluded me.
I shall try to make time to learn how to exploit Sketchup's features.
Chris
On 11 May 2008, at 03:34, Moose wrote:
> Chris Barker wrote:
>> It's an excellent programme. The files were less than 1Mb yet they
>> provided a full 3D view. Most impressive.
>>
> The modest file size is normal for a vector based rendering scheme. A
> raster type file format, like we use for photographs, has to specify
> three colour values for each pixel. A 100x100 square of one color on a
> 200x200 background of another color requires 120KB to describe.
>
> A hypothetical vector language description of a black square on white
> might look like this:
>
> img(200,200,0)
> sqr(50,50,100,100,256)
>
> For 3D,
>
> img(200,200,200,0)
> sqr(50,50,50,100,100,100,256)
>
> Under 50 bytes for the full, 3D description. Vector descriptions also
> scale with no loss of detail (Within the limits of their number
> precision.) and little difference in file size. Just add a zero to
> each
> of the above numbers except the colors to describe an image with four
> times the area, which would require 480KB in raster form.
>
> That's why vector form is used for CAD and other similar applications.
> Useless for photographs. For example, Adobe Illustrator is a vector
> image app and PS is raster. Some overlaps have developed, but the
> essential difference in nature is still there. You may embed a raster
> image in Illustrator and PS can do simple vector stuff.
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