Un-smooth color gradient

I'm a new mac user, and had used the macbook pro 2.4G with LED backlight for one more month. I find the color gradient is not smooth in second primary color to primary color. Please check the PNG files as bellow links.
http://img.photobucket.com/albums/v102/teazeb/colorgradient001.png
http://img.photobucket.com/albums/v102/teazeb/colorgradient002.png
http://img.photobucket.com/albums/v102/teazeb/colorgradient003.png
http://img.photobucket.com/albums/v102/teazeb/colorgradient004.png
http://img.photobucket.com/albums/v102/teazeb/colorgradient005.png
In those patterns you will find many vertical lines. Those will make you see some photos with contour or noise by Macbook Pro. I have double check many other PC notebooks. They don't have this issue. It is hard to believe the high-end notebook has such kind of color performance. The color performance is too poor to use the "Pro" title. I feel so disappointed to spend a huge amount of money on the Macbook pro( Poor?).

Mylenium,
thank you for the answer. But unforunately I'm a newby. Could you go into more details please ?
Mark
PS:
The problem I always got with the gradient tool is the following
The gradient starts at a certain point and uses a hard coded distance (e.g. 50 pixels from this point to this direction like a vector)
This makes it impossible to change the geometry with the full gradient
For example :Filling this rectangle with a gradient and I’m defining a vector mask to it
Afterwards I changed the vector mask to this
The gradient is cut instead of changing, compressing it.
Is there no way to define a starting point (edge, path), a direction and a target edge, path ?
Because then, after changing one of the edges, the gradient has to be recalculated.

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[merge1.jpg]
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[merge2.jpg]
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[merge3.jpg]
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[merge4.jpg]
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[merge5.jpg]
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g

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Hello c.pfaffenbichler,
first thx. for ur helpfull answer it's nearly solving my problem but maybe I did something wrong.....
By the way it sounds german ur name may we can talk in german ?
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thank you for the answer. But unforunately I'm a newby. Could you go into more details please ?
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