Re: Finding out DPI using GD

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On Tue, February 14, 2006 2:15 pm, Karuna wrote:
> Hi. Is it possible to find out the dpi of an image (preferably jpeg)
> in php?
> I can't seem to find any function to do this.

http://php.net/getimagesize

However, I have found that:

1. EXIF data in the JPEG will make it puke.
2. It doesn't seem to always correctly calculate width/heigh/DPI
independently -- It seems like the numbers get shifted so that the
total:
$WIDTH * $HEIGHT * $DPI is correct, but not the individual numbers...

This has been my experience with a large variety of images from
disparate sources, many of which are probably badly-formated JPEGs in
the first place, so it may be a non-concern if you have quality
image-editing tools making the JPEGs.

Note that PDI info is returned only in "recent" versions of PHP / GD.

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