While we're on the topic of scaling/resampling maybe someone could clarify something for me. I read somewhere that when scaling an image for display on a monitor that it was best to change the dpi by the same ratio to avoid interpolation. Elsewhere I have gotten the impression that dpi was totally and always irrelevant to images on the screen.

My limited understanding is that when scaling an image from, e.g. 1600 pixels wide to 400 pixels wide, that it is best to change dpi in the same ratio, say, from 72 dpi to 288 dpi. And further that it is even more important when upsampling an image. The desired result being the avoidance of any blurring from the software not being able to map the scaled image pixel for pixel.

Is this accurate? Does any of it actually show up on the screen or would it only apply to printed images?


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