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Answer by Seeker for Is there any practical difference between saving at 300ppi or 72ppi?

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I am learning web development and i encountered pixel unit in CSS and in reading about it i found these things.

There are two terms one is "software pixel" and one is "hardware pixel".

Software pixel is actually unit of length, its value is 1px = 1/96th in. Two screens of same dimensions will always have same software pixel. One software pixel can contain one or more hardware pixels depending on the device as you would have heard some devices have higher ppi(pixels per inch). ppi refers to hardware pixel.

Now come to printer, you have dpi, dpi here is the property of the hardware(printer). You can change it in the settings of printer. High dpi means printer would put more dots while printing and the image would look better.

Now while you are putting dpi info for an image (dpi=72 or dpi=300), it is a metadata(data about image) that concerns printer.

Now i don't know what constraints are there if you are selecting high dpi in your printer settings, for a vector graphics based image there is no issue in my opinion but i don't know about raster graphics based image.I am new myself, so if anybody knows what would happen if you select high dpi for printer and make dpi info higher for a raster graphics based image (which previously had lower dpi )please comment.


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