[3dem] dm3 vs dm4 format?

[Jean-Marc Verbavatz IJM]

Hi,

We also have a Oneview camera and we spent some time deciding which format between DM3 and DM4 we
would recommend.
As far as I can tell, from looking into it all the metadata present in DM4 files is also present in
DM3 files. 
I also heard that the difference was in the 32bits or 54 bit pointers, but it doesn't seem to make
a difference for the images from the OneView.
Therefore, we have opted for the DM3 format which opens more easily in 3rd party software like
imagej/fiji.

The only exception is for tomography because the tomography software from Gatan that we have does
not offer DM3 as a format: only DM4 and MRC but the MRC from Gatan does not contain the metadata,
so we have to use DM4 !!

best wishes,

Jean-Marc

> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Tue, 16 Apr 2019 16:13:59 +0000
> From: "Morgan, David Gene" <dagmorga at indiana.edu>
> To: "3dem at ncmir.ucsd.edu" <3dem at ncmir.ucsd.edu>
> Subject: [3dem] dm3 vs dm4 format?
> Message-ID: <5683c21697334ef794596df59541a25b at BL-CCI-D2S01.ads.iu.edu>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Hi,
> 
> One of our microscopes has a Gatan OneView camera. Users keep switching back and forth between
> saving images in dm3 or dm4 format. I would prefer to use one or the other, but I don't really know
> whether it matters which. I know that the dm4 format metadata can easily deal with exposure times,
> number of frames, etc. and so I suspect it is a "better" format for this camera. But that info may
> also be hidden in the dm3 metadata also, and if so, I'm sure I can parse it out. Does anyone have
> comments or preferences? Thanks.
> 
> --
> politics is more difficult than physics.
> A. Einstein
> 
> David Gene Morgan
> Electron Microscopy Center
> 047D Simon Hall
> IU Bloomington
> 812 856 1457 (office)
> 812 856 3221 (3200)
> http://iubemcenter.indiana.edu


--
Jean-Marc Verbavatz
--
Institut Jacques Monod
Université de Paris
Bâtiment Buffon
15 rue Hélène Brion
75205 PARIS CEDEX 13
France
Tel: +33612865565

http://www.ijm.fr/en/ijm/research/research-groups/membrane-dynamics