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This is correct, and in fact what I was going to post until you got there
first. The only slight qualification (and one that I'm not sure is relevant
for this discussion, but is worth mentioning for completeness), is that the
PNG format allows you to define a nominal PPI resolution in the file
metadata. It is completely up to applications what they do with that
information: some just ignore it, whereas others such as Adobe Illustrator
use it to inform the initial (also nominal) dimensions of the image when
you drag it into an Illustrator document.
Essentially, though, a PNG is just as you say â a definition of the pixels
themselves.
Cheers,
Joe
On Fri, Apr 7, 2017 at 8:36 AM, Syed Zaeem Hosain <Syed -dot- Hosain -at- aeris -dot- net>
wrote:
> An image in PNG format does not have any concept of pixels / inch or
> anything like that - the image is simply a certain number of pixels in each
> axis. This size is influenced by the choices you make with your rendering
> program to begin with.
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