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How do i get the resolution (dpi) of an image?

Posted on 2003-11-11
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Last Modified: 2012-06-21
I am using JAI for imagemanipulation.
I only want to get the (information of the) resolution of scanned pictures in TIFF and JPEG format with using java 1.3.1_02 and  JavaAdvancedImaging1.1.2.  
Example: me.tif = DIN A6 and scanned with 200x200dpi = shown in doublesize in java...
               or me.jpg = original 21x21 cm   scanned with 300x300 dpi = displayed in 63x63cm in java...
I don't know the dpi of the pics so i cannot display it in original size on my monitor...

Please help me,
thanks a lot flo

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Question by:daFlo
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LVL 35

Expert Comment

by:TimYates
ID: 9722180
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LVL 35

Expert Comment

by:TimYates
ID: 9722187
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Author Comment

by:daFlo
ID: 9746467
i wrote my own classes to read out the resolution...
I get all data i wanted but it was a littel work to write it...
but it works great ;) if anybody needs help about it contact me ...
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TimYates earned 1560 total points
ID: 9746527
Cool :-)

Errr....could you post the source code here?

Then ask for this question to be PAQ'd in community support :-)

That way, other people can find the solution too :-)

Congrats!!

Tim
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Author Comment

by:daFlo
ID: 9746588
i must code it better....
because of some differences in the ImageFileDirectory of TiffImages...
with an non tiff6.0format it didnt find the sdesired offssets ...
but the code follows! its made for java 1.3.1
and your tip with the second link was the kick-off where i saw: I couldnT get any info without writing own sources you get the points ;D because i cannot get it back from this thread ...

flo
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LVL 35

Expert Comment

by:TimYates
ID: 9746628
> because i cannot get it back from this thread .

Eeek!  Thanks! :-)

For future reference, you can ask at:

http://www.experts-exchange.com/Community_Support/

for Q points to be reduced

Good luck with everything!

Tim
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