query on the product

[whirlpool_fj]

i am just wondering because this application has a calibration utility. does this application has a function or anything that can change the dpi of an image?

i was subscribed to a forum and asked on changing the dpi of images. and they suggested why not try it here. i just need an idea as to how to do this... im not new in java but im new in image processing. i have no idea what classes to use.

changing image dpi and displaying it on screen...

i would gladly accept any information on this...






 

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[Harry Parker]

To answer your question:
    Yes.
I direct your attention to the docs at
    http://rsb.info.nih.gov/ij/docs/
In particular, see the documentation for "Set Scale..." under the Analyze menu.
You don't need to know anything about classes to use ImageJ. Its an
application with a great built-in macro language to automate image
processing and analysis tasks.


If you NEED to program in Java using ImageJ classes, the best place to start is with the
developers' resources page at
    http://rsb.info.nih.gov/ij/developer/index.html.
I found the "Writing ImageJ Plugins - A Tutorial" link to be a godsend for me as a junior Java programmer.

-- Harry Parker

----- Original Message ----
From: whirlpool_fj <[hidden email]>
To: [hidden email]
Sent: Wednesday, March 21, 2007 9:14:29 PM
Subject: query on the product

i am just wondering because this application has a calibration utility. does this application has a function or anything that can change the dpi of an image?

i was subscribed to a forum and asked on changing the dpi of images. and they suggested why not try it here. i just need an idea as to how to do this... im not new in java but im new in image processing. i have no idea what classes to use.

changing image dpi and displaying it on screen...

i would gladly accept any information on this...






 

---x---x--- if you can&#39;t be the sun, be a star. ---x---x---

 








 
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8:00? 8:25? 8:40?  Find a flick in no time
 with theYahoo! Search movie showtime shortcut.





 
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[Dimiter Prodanov]

>Hi,

DPI refers to dot per inch. ImageJ does not refer internally to this concept.
Images are always calculated as absolute pixel x pixel values.
The calibration seting, though, is very similar to DPI
but the units are entrely arbitrary =user-selected
you can calibrate to micro-meters, meters, kilometers, miles, inches etc.
You only type in the scale factor, or if  you dont know the number
you can measure a structure with a known size and then use the
measurement as the feed-in into the calibrtation.

cheers


_______________________________________________________________________
Dr Dimiter Prodanov, MD, Ph.D.

Neural Engineering Rehabilitation Laboratory
(Laboratoire de Génie de la Réhabilitation Neurale)
Département de Physiologie et Pharmacologie
Université catholique de Louvain
Avenue Hippocrate, 54
POBox UCL-5446 / B-1200 Bruxelles -Belgique-
Phone: [phone]
Fax: [phone]

http://www.md.ucl.ac.be/gren

[dscho]

Hi,

On Thu, 22 Mar 2007, Dimiter Prodanov wrote:

> DPI refers to dot per inch. ImageJ does not refer internally to this concept.
> Images are always calculated as absolute pixel x pixel values.
> The calibration seting, though, is very similar to DPI
> but the units are entrely arbitrary =user-selected
> you can calibrate to micro-meters, meters, kilometers, miles, inches etc.
> You only type in the scale factor, or if  you dont know the number
> you can measure a structure with a known size and then use the
> measurement as the feed-in into the calibrtation.

In effect, you _can_ set DPI, by setting the voxel sizes accordingly. But
as far as I can tell, there is no dialog to set that yet. As a workaround,
you can create a new macro, and write something like

        setVoxelSize(2.3, 1, 10.2, "inch");

and run that macro, to set the voxel dimensions 2.3 x 1 x 10.2 inch^3.

Hth,
Dscho

P.S.: If you need it as a user-friendly dialog, I can write a simple
plugin for that.