Posts: 488
Name: Chip Johns
Location: Savannah Georgia
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Hi Chris,
This is due to antialiasing. The gradual blending from one color to another.
When you create the file you need to know what color the image is going to sit on. When you save the file as a gif file you need to select this color during this process.
This image shows the save for web dialogue settings.
You need to set the matte color to what the background will be.
(click on each image to see a bigger version)
aa1.jpg
Notice the color I choose. You can see the effect.
aa2.jpg
You can turn anti aliasing off. But, its not a pretty picture.. Notice the jaggies.l They do not blend in.
test2.gif
One way to help with this is to use text and shapes that lend better to this. Notice that using arial for instance works a little bit better. This image also has a transparent background but the jaggies are not as appearant:
aa3.gif
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Rastered images. When you creat a vector image and save it for use on the web. i.e. gif or jpg, you are transforming this image into a rasterized version. Once saved as a gif for instance this version of the image is not a vector, but raher a resterised version.
The reason we create a logo in vector format, is becuase this image will probably need to be used in more application than just on our web page. If we want business cards we will use it. If we want an add in the paper or a magnetic sign, or painted sign on our car/truck, we will use the vector version.
Another reason to create a graphic that is not a logo in vector is just for prefference. Some of us are more comforatble with vector creation.
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When you increase magnification to 1600% you will see jaggies simply due to the limitations of your display. No matter how good your monitor is, it still has the limitation of the size of a pixel.
Last edited by ChipJohns; 11-09-2006 at 02:39 PM..
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