All other email clients (and I mean all), look great, except on any device running iOS (both 7 & 8), I'm getting a line inbetween images. When you zoom in, they disappear. My guess is this has something to do with subpixel rounding. I've read one solution is to alter the meta to set remove zooming, but I'd rather not take away native functionality. Any ideas? Any one else ran into this?

My images are set as follows:

HTML
<td><img src="http://site.com/image.jpg" width="600" height="50" align="left" /></td>

CSS
img {
border-style: none;
display: block;
border: 0;
height: auto;
line-height: 100%;
outline: none;
text-decoration: none;
}
td {
border-collapse: collapse;
line-height: 0;
margin-bottom:-1px;
font-size: 3px;
}

Reference Image (Line is faint, but there):
http://i.imgur.com/1MgsHIL.png