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EmilyJ
EmilyJ

Reputation: 892

Image PPI and dimensions

Let's say I have an original PNG image 60x60 at 144 PPI (Pixels Per Inch). I need to have two images at 60x60 (72 DPI) and 120x120 (72 DPI) dimensions.

Since the original image has a 144 PPI, can I make it to 120x120 without seeing any degrading the image quality. Will the result have the same as making the image at 120x120 at 72 PPI beginning with?

Upvotes: 0

Views: 451

Answers (1)

leonbloy
leonbloy

Reputation: 75936

PPI relates image size in pixels to image size in inches (or whatever physical distance unit).

Hence, when a 60x60 image at 144 PPI has a physical size of 0.42x0.42 inches. When you say that you need to have an image at 60x60 and 72 DPI -that would imply a physical size of 0.83x0.83 inches- you don't make clear if you want to respect the original physical dimensions (in that case, you could pad the original image with a blank margin, and resample it to 60 pixels), or not (in that case, you'd simply change do a physical scale of the image, which would amount to changing the PPI, and no need of pixels resampling).

Once you define what you want, the rest of the question, I think, is easy to answer.

Upvotes: 1

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