17" better image quality than 19"?

In a 19" monitor, aren't the pixels farther apart than in a 17", resulting in lost image quality? I edit video, and image quality is important, so I'm wondering whether to get a 17" or 19". I've seen both in stores, and the size is hardly noticeable. Are there any 19" with a slightly higher resolution?

Some added thoughts for video editing:
* compare the 6-bit and 8-bit models to see if you can tell the difference
* compare the matte finish LCDs with the glossy finish ones. The matte finish will give solid colors a blotchy look, which can be annoying for precise image editing.
* consider an IPS based panel, since viewing angle issues on the other panel types will cause colors to shift a little from one end to the other; you have to decide whether you can notice this; it may not be as big of an issue for video editing as it is for accurate image editing
* watch some videos on the monitor and see if the screen door effect bothers you. Even on the high dot pictch of a 20" LCD, I notice the screen door effect on areas of similar color in video; I would think that this would be very annoying for video as you sometimes can't tell if your video has odd dithering in it or if it's just your monitor. This is probably a problem with all LCDs, and likely only a CRT would solve the problem. In fact, for video editing, you might want to seriously consider a flat screen CRT (perhaps a cheap used one from craigslist.com)