Stitching EXR images

[Karmadillo]

Hi,

Which stitch settings do I select to create an EXR output image from
EXR input images?

I have a series of EXR images as inputs into my hugin project.
I have successfully aligned them with control points.

Choices are Exposure corrected LDR
Exposure Fused from stacks
Exposure Fusedd from Any arrangement
High Dynamic Range

I don't think the Remapped images, Combined stacks, and Layers are
relevant to me for this type of project.
Selecting HDR enables the HDR merger which isn't needed because the
input images are HDR already.

What do you recommend?

[Bruno Postle]

On Wed 28-Dec-2011 at 15:42 -0800, Karmadillo wrote:
>
>I have a series of EXR images as inputs into my hugin project.

>Choices are Exposure corrected LDR

>Exposure Fused from stacks
>Exposure Fusedd from Any arrangement
>High Dynamic Range

>Selecting HDR enables the HDR merger which isn't needed because the

>input images are HDR already.

You don't want 'exposure fusion' or 'HDR merging' since these only
make sense with LDR input, the default 'exposure corrected' output
should work as you expect (creating HDR output from HDR input). I
know it says 'low dynamic range' in the GUI, but it really shouldn't
since Hugin/nona/enblend can cope with both LDR and HDR data.

--
Bruno

[Karmadillo]

I agree that in theory this seems to be the best way to do it, however
once I select "exposure corrected"
The HDR file format section is greyed out, so I only get the LDR file
format options of JPEG, PNG, and TIFF.
The prevents me from stitching EXR to EXR.

[Bruno Postle]

On Sat 31-Dec-2011 at 04:20 -0800, Karmadillo wrote:
>I agree that in theory this seems to be the best way to do it, however
>once I select "exposure corrected"
>The HDR file format section is greyed out, so I only get the LDR file
>format options of JPEG, PNG, and TIFF.
>The prevents me from stitching EXR to EXR.

Have you tried TIFF? This should support HDR data, sorry I haven't
time to test this myself.

--
Bruno

[Gnome Nomad]

The TIFF format supports 48-bit color aka HDR.

--
Gnome Nomad
gnome...@gmail.com
wandering the landscape of god
http://www.cafepress.com/otherend/

[Karmadillo]

TIFF is not as good as EXR in my circumstances due to its file size
restrictions.
Because EXR is the native format within Hugin for HDR work, I am
trying to do an EXR > EXR > EXR process.
The 4GB file size restriction of TIFF is more significant for HDR
imagery - and it means that the final tomemapped output is retricted
to about 1.2GB in my experience.

So let me rephrase my original question.
How to do I generate HDR EXR stitiched panoramas from HDR EXR input
images using Hugin while avoiding the TIFF file format?

On Jan 2, 4:24 pm, Gnome Nomad <gnomeno...@gmail.com> wrote:
> Bruno Postle wrote:
> > On Sat 31-Dec-2011 at 04:20 -0800, Karmadillo wrote:
> >> I agree that in theory this seems to be the best way to do it, however
> >> once I select "exposure corrected"
> >> The HDR file format section is greyed out, so I only get the LDR file
> >> format options of JPEG, PNG, and TIFF.
> >> The prevents me from stitching EXR to EXR.
>
> > Have you tried TIFF?  This should support HDR data, sorry I haven't time
> > to test this myself.
>
> The TIFF format supports 48-bit color aka HDR.
>
> --
> Gnome Nomad

> gnomeno...@gmail.com
> wandering the landscape of godhttp://www.cafepress.com/otherend/

[Bruno Postle]

On Mon 02-Jan-2012 at 14:41 -0800, Karmadillo wrote:
>TIFF is not as good as EXR in my circumstances due to its file size
>restrictions.
>Because EXR is the native format within Hugin for HDR work, I am
>trying to do an EXR > EXR > EXR process.

My question was have you tried TIFF? if the HDR -> HDR workflow
works when you simply select TIFF output, then you need to file a
bug report, since EXR output should then also be an option in the
GUI.

>So let me rephrase my original question.
>How to do I generate HDR EXR stitiched panoramas from HDR EXR input
>images using Hugin while avoiding the TIFF file format?

Everything is possible if you work on the command-line, you can ask
Hugin to not create the ouput file at all and only save the
'remapped images'. Then blend them with enblend like so:

enblend -o project.exr project_0001.exr project_0002.exr [...]

--
Bruno

[Karmadillo]

Yes I have tried stitching to HDR and the process crashes or I get
enblend out of memory errors. However for smaller projects I do get an
HDR TIFF output
Thanks Bruno for the advice re remapping and using the command line.
I'm happy to use this process.
Is there anywhere I can make a feature request to Hugin to cater for
EXR>EXR in the stitcher tab?

Rich

[Gnome Nomad]

TIFF doesn't have to be limited to 4GB file size:

http://www.aperio.com/bigtiff/

--
Gnome Nomad

[Karmadillo]

Perhaps this version of libtiff could be incorporated into enblend and
enfuse when it becomes an official stable release?