When resizing for on screen I never look at DPI setting just the amount of pixels. Resizing method is set to bicubic. I've very little problems with aliasing. At some point you are going to get aliasing with near horizontal or near vertical lines, this is unavoidable because of the pixels you're stowing the info into. You could always rotate to fix a horizontal/vertical line so it's exactly aligned using the measure tool which is hidden under the pipet/colorsucker tool.

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