HDR

[Sylvain Lacomble]

Dear all,

Has anyone tried to process HDR images with imageJ?
This would be extremely useful!
With my best wishes,
Sylvain


--
GULL lab - SWDSOP
University of Oxford
South Parks Road
OXFORD OX1 3RE - UK

[Przemko]

Sylvain Lacomble wrote:
> Dear all,
>
> Has anyone tried to process HDR images with imageJ?
> This would be extremely useful!
> With my best wishes,
> Sylvain
>
>
>  
I would be very interested in HDR on ImageJ as well. I tried it on
Photoshop and one can get very nice Nomarski/Fluorescence overlays.
Under normal conditions, Nomarski pictures are rather difficult to take
but HDR makes it really simpler and much more realistic (WYSIWYG).
Przemko

--
Przemko Tylzanowski Ph.D.
LSD & Joints
O & N1, box 813- dark green
University of Leuven
Herestraat 49
3000 Leuven, Belgium

phone: [phone]
fax  : [phone]



Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm

[Jonathan Hilmer]

I assume you're looking for HDR photos in the manner of Debevec?  I'm
sure it would be fairly easy to implement this in ImageJ, but I
haven't seen it done so far.  I've tried that method in Cinepaint with
good results, though just on test images and not technical examples.

In ImageJ, we've used a manual approach to combine gel scans that
start out sub-16bit.  The end results are worth it, but the method is
very time-intensive and I would be very interested in an automated
routine.

Jonathan



On Tue, Apr 29, 2008 at 1:29 AM, Przemko <[hidden email]> wrote:

> Sylvain Lacomble wrote:
>
> > Dear all,
> >
> > Has anyone tried to process HDR images with imageJ?
> > This would be extremely useful!
> > With my best wishes,
> > Sylvain
> >
> >
> >
> >
>  I would be very interested in HDR on ImageJ as well. I tried it on
> Photoshop and one can get very nice Nomarski/Fluorescence overlays. Under
> normal conditions, Nomarski pictures are rather difficult to take but HDR
> makes it really simpler and much more realistic (WYSIWYG).
>  Przemko
>
>  --
>  Przemko Tylzanowski Ph.D.
>  LSD & Joints
>  O & N1, box 813- dark green
>  University of Leuven
>  Herestraat 49
>  3000 Leuven, Belgium
>
>  phone: [phone]
>  fax  : [phone]
>
>
>
>  Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
>

[Andreas Jahnen]

Hello,

I will have a look at this in more detail as I would like to have HDR
functionallity in ImageJ as well.

So far I have used HDR only as a user (pfstools, qtpfsgui) and I need to
dig into this in more detail. Currently, I think it is not that easy. You
need to at least support the file formats and have hdr functions
available. Can anybody recommend good documentation on HDR?

I will keep you informed about my work... .

So long,
                Andreas

-----------------------------------------------------------------
Andreas Jahnen  -  Ingenieur de Recherche
[hidden email]
-----------------------------------------------------------------
CRP Henri Tudor  -  http://santec.tudor.lu
2A, rue Kalchesbrück
L-1852 Luxembourg
-----------------------------------------------------------------

ImageJ Interest Group <[hidden email]> wrote on 29.04.2008 16:47:37:

> I assume you're looking for HDR photos in the manner of Debevec?  I'm
> sure it would be fairly easy to implement this in ImageJ, but I
> haven't seen it done so far.  I've tried that method in Cinepaint with
> good results, though just on test images and not technical examples.
>
> In ImageJ, we've used a manual approach to combine gel scans that
> start out sub-16bit.  The end results are worth it, but the method is
> very time-intensive and I would be very interested in an automated
> routine.
>
> Jonathan
>
>
>
> On Tue, Apr 29, 2008 at 1:29 AM, Przemko <[hidden email]>

wrote:

> > Sylvain Lacomble wrote:
> >
> > > Dear all,
> > >
> > > Has anyone tried to process HDR images with imageJ?
> > > This would be extremely useful!
> > > With my best wishes,
> > > Sylvain
> > >
> > >
> > >
> > >
> >  I would be very interested in HDR on ImageJ as well. I tried it on
> > Photoshop and one can get very nice Nomarski/Fluorescence overlays.

Under
> > normal conditions, Nomarski pictures are rather difficult to take but
HDR

> > makes it really simpler and much more realistic (WYSIWYG).
> >  Przemko
> >
> >  --
> >  Przemko Tylzanowski Ph.D.
> >  LSD & Joints
> >  O & N1, box 813- dark green
> >  University of Leuven
> >  Herestraat 49
> >  3000 Leuven, Belgium
> >
> >  phone: [phone]
> >  fax  : [phone]
> >
> >
> >
> >  Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
> >

[Michael Schmid]

Hi Andreas,

there is a bit about HDR in the english Wikipedia, with a few
links
   http://en.wikipedia.org/wiki/High_dynamic_range_imaging

Since almost everyone uses digital sensors now, I think a
first step could be rather simple, get the correlation between
non-saturated pixels values of two input images, and finding
the pixel value offset and factor between the images. Then one
could combine them, maybe with some "smooth transition", i.e.
a weighted sum for pixel values that are reasonably well
exposed on both images.

ImageJ supports float images, so we need not care about special
HDR formats unless we want to read HRD images already present
in such formats.

For the beginning, I think that we don't need all the procedures
to map the high dynamic of a HDR image onto a smaller range for
display - this looks like a the more difficult task.

Best wishes,

Michael
________________________________________________________________
Michael Schmid                    email: [hidden email]
Institut fuer Allgemeine Physik, Technische Universitaet Wien
Wiedner Hauptstr. 8-10/134, A 1040 Wien, Austria
Tel. [phone] or -13453, Fax [phone]
________________________________________________________________

On 30 Apr 2008, at 09:17, Andreas Jahnen wrote:

> Hello,
>
> I will have a look at this in more detail as I would like to have HDR
> functionallity in ImageJ as well.
>
> So far I have used HDR only as a user (pfstools, qtpfsgui) and I  
> need to
> dig into this in more detail. Currently, I think it is not that  
> easy. You
> need to at least support the file formats and have hdr functions
> available. Can anybody recommend good documentation on HDR?
>
> I will keep you informed about my work... .
>
> So long,
>                 Andreas
>
> -----------------------------------------------------------------
> Andreas Jahnen  -  Ingenieur de Recherche
> [hidden email]
> -----------------------------------------------------------------
> CRP Henri Tudor  -  http://santec.tudor.lu
> 2A, rue Kalchesbrück
> L-1852 Luxembourg
> -----------------------------------------------------------------
>
> ImageJ Interest Group <[hidden email]> wrote on 29.04.2008  
> 16:47:37:
>
>> I assume you're looking for HDR photos in the manner of Debevec?  I'm
>> sure it would be fairly easy to implement this in ImageJ, but I
>> haven't seen it done so far.  I've tried that method in Cinepaint  
>> with
>> good results, though just on test images and not technical examples.
>>
>> In ImageJ, we've used a manual approach to combine gel scans that
>> start out sub-16bit.  The end results are worth it, but the method is
>> very time-intensive and I would be very interested in an automated
>> routine.
>>
>> Jonathan
>>
>>
>>
>> On Tue, Apr 29, 2008 at 1:29 AM, Przemko <[hidden email]>
> wrote:
>>> Sylvain Lacomble wrote:
>>>
>>>> Dear all,
>>>>
>>>> Has anyone tried to process HDR images with imageJ?
>>>> This would be extremely useful!
>>>> With my best wishes,
>>>> Sylvain
>>>>
>>>>
>>>>
>>>>
>>>  I would be very interested in HDR on ImageJ as well. I tried it on
>>> Photoshop and one can get very nice Nomarski/Fluorescence overlays.
> Under
>>> normal conditions, Nomarski pictures are rather difficult to take  
>>> but
> HDR
>>> makes it really simpler and much more realistic (WYSIWYG).
>>>  Przemko
>>>
>>>  --
>>>  Przemko Tylzanowski Ph.D.
>>>  LSD & Joints
>>>  O & N1, box 813- dark green
>>>  University of Leuven
>>>  Herestraat 49
>>>  3000 Leuven, Belgium
>>>
>>>  phone: [phone]
>>>  fax  : [phone]
>>>
>>>
>>>
>>>  Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
>>>

[Burger Wilhelm]

Hello,

while Wikipedia is certainly a convenient source to get started, for attempting a thorough implementation of HDRI concepts I want to recommend this excellent book by Reinhard et al., "High Dynamic Range Imaging: Acquisition, Display, and Image-Based Lighting" (Morgan Kaufmann):

http://www.amazon.com/High-Dynamic-Range-Imaging-Acquisition/dp/0125852630

Good luck,
Wilhelm

> -----Original Message-----
> From: ImageJ Interest Group [mailto:[hidden email]] On
> Behalf Of Michael Schmid
> Sent: Wednesday, April 30, 2008 11:26 AM
> To: [hidden email]
> Subject: Re: HDR
>
> Hi Andreas,
>
> there is a bit about HDR in the english Wikipedia, with a few
> links
>    http://en.wikipedia.org/wiki/High_dynamic_range_imaging
>
> Since almost everyone uses digital sensors now, I think a
> first step could be rather simple, get the correlation between
> non-saturated pixels values of two input images, and finding
> the pixel value offset and factor between the images. Then one
> could combine them, maybe with some "smooth transition", i.e.
> a weighted sum for pixel values that are reasonably well
> exposed on both images.
>
> ImageJ supports float images, so we need not care about special
> HDR formats unless we want to read HRD images already present
> in such formats.
>
> For the beginning, I think that we don't need all the procedures
> to map the high dynamic of a HDR image onto a smaller range for
> display - this looks like a the more difficult task.
>
> Best wishes,
>
> Michael
> ________________________________________________________________
> Michael Schmid                    email: [hidden email]
> Institut fuer Allgemeine Physik, Technische Universitaet Wien
> Wiedner Hauptstr. 8-10/134, A 1040 Wien, Austria
> Tel. [phone] or -13453, Fax [phone]
> ________________________________________________________________
>
> On 30 Apr 2008, at 09:17, Andreas Jahnen wrote:
>
> > Hello,
> >
> > I will have a look at this in more detail as I would like
> to have HDR
> > functionallity in ImageJ as well.
> >
> > So far I have used HDR only as a user (pfstools, qtpfsgui) and I  
> > need to
> > dig into this in more detail. Currently, I think it is not that  
> > easy. You
> > need to at least support the file formats and have hdr functions
> > available. Can anybody recommend good documentation on HDR?
> >
> > I will keep you informed about my work... .
> >
> > So long,
> >                 Andreas
> >
> > -----------------------------------------------------------------
> > Andreas Jahnen  -  Ingenieur de Recherche
> > [hidden email]
> > -----------------------------------------------------------------
> > CRP Henri Tudor  -  http://santec.tudor.lu
> > 2A, rue Kalchesbrück
> > L-1852 Luxembourg
> > -----------------------------------------------------------------
> >
> > ImageJ Interest Group <[hidden email]> wrote on 29.04.2008  
> > 16:47:37:
> >
> >> I assume you're looking for HDR photos in the manner of
> Debevec?  I'm
> >> sure it would be fairly easy to implement this in ImageJ, but I
> >> haven't seen it done so far.  I've tried that method in Cinepaint  
> >> with
> >> good results, though just on test images and not technical
> examples.
> >>
> >> In ImageJ, we've used a manual approach to combine gel scans that
> >> start out sub-16bit.  The end results are worth it, but
> the method is
> >> very time-intensive and I would be very interested in an automated
> >> routine.
> >>
> >> Jonathan
> >>
> >>
> >>
> >> On Tue, Apr 29, 2008 at 1:29 AM, Przemko <[hidden email]>
> > wrote:
> >>> Sylvain Lacomble wrote:
> >>>
> >>>> Dear all,
> >>>>
> >>>> Has anyone tried to process HDR images with imageJ?
> >>>> This would be extremely useful!
> >>>> With my best wishes,
> >>>> Sylvain
> >>>>
> >>>>
> >>>>
> >>>>
> >>>  I would be very interested in HDR on ImageJ as well. I
> tried it on
> >>> Photoshop and one can get very nice Nomarski/Fluorescence
> overlays.
> > Under
> >>> normal conditions, Nomarski pictures are rather difficult
> to take  
> >>> but
> > HDR
> >>> makes it really simpler and much more realistic (WYSIWYG).
> >>>  Przemko
> >>>
> >>>  --
> >>>  Przemko Tylzanowski Ph.D.
> >>>  LSD & Joints
> >>>  O & N1, box 813- dark green
> >>>  University of Leuven
> >>>  Herestraat 49
> >>>  3000 Leuven, Belgium
> >>>
> >>>  phone: [phone]
> >>>  fax  : [phone]
> >>>
> >>>
> >>>
> >>>  Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
> >>>
>