This is a tricky problem to try and explain without actually showing one of the pictures in question, but I'll try to be clear.
Vital statistics first: I have an HP Pavilion 9800 computer with XP Home version, HP Pavilion v70 monitor, and a Canon S600 printer. I wanted to print some photos I took with my Nikon Coolpix 775, and had no difficulty getting them into my Picasa program.
However, when I went to print a copy of one, the photo of a person, the print came out with horizontal stripes 1/4 inch high alternating light and dark colors, the entire height of the 8 1/2x11 sheet. This happened once before, quite recently, and only seems to happen when printing from a photo. Printing a web page in color doesn't seem to have this problem.
When I print a color picture there is always a regular, herky-jerky action in the printer, a sort of push/wait/push/wait sequence, with a rhythm that sounds as though it would account for these horizontal stripes, but the stripes have never appeared previously.
These photos are important to me, and I would like to be able to print them out correctly.
Does anyone recognize this problem?