On my Windows 7 / FF6, the gradient looks pretty smooth:
so I think that what you're seeing is machine specific.
However, you might have better results by using a .GIF with a transparent bottom (to fade to background color) rather than a .JPG. In general, you've got better control over the colors in a .GIF because it's not a lossy format if you have few enough colors.
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在我的 Windows 7 / FF6 上，渐变看起来非常平滑：
所以我认为您所看到的是机器特定的。
但是，使用具有透明底部（淡入背景颜色）的 .GIF 而不是 .JPG 可能会获得更好的结果。一般来说，您可以更好地控制 .GIF 中的颜色，因为如果颜色足够少，它就不是有损格式。
On my Windows 7 / FF6, the gradient looks pretty smooth:
so I think that what you're seeing is machine specific.
However, you might have better results by using a .GIF with a transparent bottom (to fade to background color) rather than a .JPG. In general, you've got better control over the colors in a .GIF because it's not a lossy format if you have few enough colors.