Anti-alias

hi,
I use Preview to check pictures of insects (focus, etc...) and it's very hard to evaluate picture sharpness as long as an anti-alias algorithm is always activated : the picture is very sharp and half a second later is all "dithered".
Is there a possibility to deactivate this ?
I do not want to use software as Gimp or Photoshop : these softwares always open all the pictures selected in a new window and it's quite unusable with hundreds of 2000x3000 pics.

Hi again
I'm sorry. Bad use of terminology I suppose. What I meant by
"background shading" was to do the following:
Double click the text. When you do this, you get a dialog
very similar to what you see when you edit a caption.
Now, drag the mouse across all the text
EXCEPT the first letter. Here is where you will apply what I
mistakenly referred to as the "background shading". I meant to say
"highlight". I get confused becase all it affects is the background
shading behind the text that is selected. If it were a true
highlight, I would expect that if I applied yellow for instance, my
black letters would be a bit washed out, as the yellow was applied
over the top of the letters. Instead, it applies shading behind
them.
My question slide has a white background. So what I do is to
click the Highlight button to pop up the color picker. Then click
the More Colors... link.
As I said earlier, my background is white already. So I
choose a color that is extremely near white. The color mixer dialog
shows me RGB values of 255 each. All I do is change one of them to
254.
Click OK to dismiss all the dialogs and preview.
If yours behaves like mine (and if it doesn't, I'm not sure
why) you should notice the anti-aliasing stops.
Cheers... Rick

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