This was never a problem with ArcGIS 9 but it appears that in 10.0 Esri has added small horizontal lines as the default when including color ramps in legends. I want to get rid of these annoying lines, but I haven't figured out how to. Anyone else run into this problem?
you can try this :
right click in your legend
click convert to graphics.then click Ungroup . continue this process(ungroup) for your color ramp . the ungroup option will be disable.
right click your color ramp .click properties
. click change symbol . click edit symbol. in symbol property editor window , choose gradient fill symbol for type . . you can change style, interval etc.
I think I see what you are talking about (see screenshot below), and no, I do not think there is any easy way to get rid of the tic marks along the color ramp.
About the only two things you can do is use ArcObjects to set the color ramp symbol's
ShowTics property to false (which I am not positive will do the trick but sounds plausible), or use the drawing toolbar to manually draw the legend or "cover up" the tic marks, with a white rectangle for instance.
Perhaps the best course of action would be to post this request on ArcGIS Ideas and get people to upvote it.