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I'm NOT challenging your help and instruction and my observation is certainly not any better. I'm just adding to the conversation as I once noted long ago that the spacing of vertical and horizontal lines would impact their appearance as they were scaled down. The wider the line and the less spacing you have between the repeating pattern, the darker the image becomes.

EXACTLY! That's why I only use a height of 1 pixel when creating vertical lines, however, you still have to create space between the lines.........for horizontal lines, as you stated, width is irrelevant! That's why I would make my document for my horizontal lines, 4 pixels in height and 1 pixel in width.