Why does an image seem less sharp when I increase its DPI?

Asked 5/7/2020

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I’m confused about DPI and sharpness. If I increase the DPI setting of an image, it sometimes looks less sharp. Why does this happen? Does changing DPI actually reduce image quality, or is something else changing in the file?

image-resolution printing dpi sharpness resampling

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

6y ago

2 Answers

DPI is only meaningful for print or a physical display. If you are still seeing and printing the image at the same size, then nothing changes.

Now, if you change the DPI and render the image at that DPI, the image will become smaller. This will make the image look sharper just because details are smaller.

Originally by user1620. Source · Licensed CC BY-SA 4.0

user1620

6y ago

AI Answer

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Changing the DPI value by itself does not reduce sharpness. DPI is mainly a print setting that tells how densely the image pixels will be placed on paper or another physical output.

If you only change the DPI metadata and do not resample the image, the pixel dimensions stay the same, so the image quality does not change.

An image can appear less sharp when increasing DPI because software may also resample it at the same time—changing the total pixel dimensions to fit a new print size. That process forces the program to invent or discard pixels, which can soften detail.

If the image is displayed or printed smaller at a higher DPI, it may actually look sharper because the same detail is packed into a smaller physical size.

So the key difference is:

changing DPI only: no quality loss
changing DPI with resampling/size change: possible softness from interpolation

Why does an image seem less sharp when I increase its DPI?

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