Help. Sharp looking web graphics.

Hello.
I'm a newbie, so hopefully someone can help me ;0)
My problem is this:
- on linkedIn, for example, the size for the header must be at least 1400px X 425 px, it says.
- so, I opened Illustrator and made a 1400px X 425 px rectangle
- I made the logo and uploaded it to linkedIn
now...
on my profile, it seems like tho logo isn't very sharp. Why? In Illustrator it is - even on 100%
I've had same problems with other logos, graphics...from InDesign and Photoshop.
I work on a Macbook Pro 15" with a retina screen and I see the linkedIn page on this device, as well.
I try to figure out, by searching the net, if the pixels or dpi or ppi, or what, has anything to do with it.
Can someone help or link me to a good tut? Is my problem a setting in my Adobe Programs?

Thank you. Both of you. So basically i need to find out about 'pixel (sub-) sampling and how it affects antialiasing and thus edge sharpness' - as you wrote? I'll go through the web...do you have an idea to a tutorial or something?

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I. G. wrote:
> Ok, so I've downloaded the Fw trial to see how it's
better for web graphics
> than Photoshop. With Photoshop the usual problem is that
I have to messing
> around to turn on/off layers, copy parts of images into
new images to export
> transparent logos etc. so I hoped that Fw have some
intelligent slice system
> for one step exports. Unfortunately I haven't been able
to find it. Maybe I'm
> wrong but it seems to me that Fw has a very primitive
flat slicing system, no
> overlapping is possible. So for a very basic example if
I have a background
> graphics on the top of the page that I want to export
(not the entire page) and
> a logo *on* it that I want to export as a transparent
png or maybe just as a
> jpg including the background, it's impossible, because
the logo slice will
> divide the page into rectangles no matter what. I don't
care about
> HTML/CSS/whatever I just want to export overlapping
graphic slices in one
> simple step by properly defined slices. Looks like I
couldn't find the one step
> solution I hoped for in Fw. Am I missing something?
>
>
>
>
>
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and handles
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to
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>>So for a very basic example if I have a background
> graphics on the top of the page that I want to export
(not the entire
page) and
> a logo *on* it that I want to export as a transparent
png or maybe
just as a
> jpg including the background, it's impossible, because
the logo slice
will
> divide the page into rectangles no matter what.<<
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to have
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background
image and as separate slice for the logo.
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image or as a background image within another containing div.
HTH
Jim Babbage - .:Community MX:. & .:Adobe Community
Expert:.
http://www.communityMX.com/
CommunityMX - Free Resources:
http://www.communitymx.com/free.cfm
.:Adobe Community Expert for Fireworks:.
Adobe Community Expert
http://tinyurl.com/2a7dyp
See my work on Flickr
http://www.flickr.com/photos/jim_babbage/

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