[texhax] includegraphics and image scaling

[Peter Davis]

On Thu, Dec 9, 2010 at 6:13 PM, Peter Davis <pfd at pfdstudio.com> wrote:

>
>
>> I've run into this before ... where different tools report different
>> resolutions for JPEG files.  If memory serves, ImageMagick always reported
>> 72dpi, whereas the IJG JPEG Library reported something else.  I think this
>> is the result of multiple file formats with potentially inconsistent fields.
>>
>
>
> Interestingly, Adobe Photoshop CS5 and Adobe InDesign CS5 report the image
> resolution as 96ppi.
>
> I'm using XeTeX (xelatex).  Is that using ImageMagick internally to get the
> resolution?
>


Thanks, Martin, for the tip about jhead.  I was not familiar with that tool.
 That appears to agree with Adobe, Windows, etc:

C:\Users\peterd\images>jhead -v Chrysanthemum.jpg
JFIF SOI marker: Units: 1 (dots per inch)  X-density=96 Y-density=96
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