David B Teague ha scritto:
Charles Marcus wrote:
On 12/9/2009, David B Teague ([email protected]) wrote:
Many thanks for your response. I conclude with surprise that from
what you say, "Draw" cannot erase details, or at least it erases
details with difficulty. What does one do when one makes a mistake?
"Undo" is a blunt instrument.
Draw is a VECTOR GRAPHICS program. 'Erase' is something one does with a
RASTER GRAPHICS program. If I nderstand correctly (not an expert),
vector graphics are essentially just visual representations of
mathematical expressions.
Shouting the name of a program and its type when the recipient has no
knowledge of what that means is a waste of energy typing. Please spend a
few words saying what this means in a way that explains why that makes
deleting a symbol difficult and why that doesn't make the program useless.
I understand the difference between a page layout program such as
Scriptsit and a word processing program such as Writer. Unless this is
something else I think I know about but do not, with the page layout the
idea is to assemble the already constructed pieces in relation to each
other to make a visually attractive documemnt, whereas with the word
processor, the words, typeface and font, and format are of interest.
Now tell me in a few words what the hell Draw DOES so I can understand
why "erase" is so foreign to it.
I'll go through the Draw tutorial carefully and see if I can find
what Draw does. Meanwhile I'll take a look at "the Gimp".
GIMP is a RASTER GRAPHICS program. Supposedly it does (or did) have some
very limited support for vector graphics, but thats not its purpose.
Again, yelling the name of a program doesn't help. Please characterize,
without shouting, a Raster Graphic program, and why it is so different
from a vector graphics program that it allows a graphical element to be
removed.
And don't yell. I'm ignorant, not stupid. Besides, shouting doesn't help
the stupid or the ignorant.
--David
Hi,
I totally agree with you that yelling doesn't help anyone.
But you should take that capital letters as a hint: you're in fact
asking someone to do your homework.
Having said that, let me answer in a few words. A bitmap is a collection
of pixels (points with a colour, if you prefer). A raster graphics
program like The Gimp let you modify the single pixels that compose the
image.
A vector image is a collection of mathematical formulas that describe
lines and areas. When you see a vector image on the screen, what you're
actually looking at is a /rasterized/ version of it. That is, the viewer
program calculates the formulas at a certain resolution and renders them
on the screen. If you zoom in or out, the formulas are re-calculated and
rendered at a different resolution. That's why vector images don't
degrade when zooming, like bitmap ones do.
Googling for vector vs raster I found
http://www.graphicdesignforum.com/forum/showthread.php?t=41
HTH
--
Marcello Romani
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