HDR vs JPEG

[Sean Sykes]

Hi,

I'm new to PTGui.
I am trying to make HDRIs for use with Cinema4D using a Ricoh Theta. I have shot bracketed images in DNG format. Obviously I am using PTGui to combine and distort the images.

I am saving out from PTGui in JPEG and HDR formats. What I dont understand is why the JPEGs are coming out bright and clear but the HDR is dark and gloomy.

I have attached a screenshot showing the difference

Thanks

Sean

[Erik Krause]

Am 15.08.22 um 15:16 schrieb Sean Sykes:

> I am saving out from PTGui in JPEG and HDR formats. What I dont understand
> is why the JPEGs are coming out bright and clear but the HDR is dark and
> gloomy.

.jpg is tonemapped while .hdr is not. HDR formats are not images, but
luminance data with a (usually) much wider dynamic range than can be
displayed on a normal monitor.

Photoshop displays only a fraction of the available dynamic range of HDR
files. You can use the exposure adjustment to scroll through the
complete dynamic range.

If I understood correctly you need the panoramas for IBL. In that case
you shouldn't apply any tonemapping, you need the complete dynamic range.

--
Erik Krause

[Sean Sykes]

> You can use the exposure adjustment to scroll through the

complete dynamic range.

Do you mean add an Adjustment Layer in Photoshop?

Sean

[PTGui Support]

There's a '32 bit exposure' slider in Photoshop, i found a screenshot in
this article:

https://aradwan.de/en/2017/02/22/fighting-with-photoshop-32-bit-mode/

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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[Sean Sykes]

Guys thank you for this.

Do you know if there are any workflow tutorials documenting the process of making 32-bit HDRi images with the Ricoh Theta cameras for use with 3D software? I have struggled to find any such specific videos.

-
Sean

[Erik Krause]

Am 15.08.22 um 18:27 schrieb Sean Sykes:

> Do you know if there are any workflow tutorials documenting the process of
> making 32-bit HDRi images with the Ricoh Theta cameras for use with 3D
> software? I have struggled to find any such specific videos.

Not specific, but a good starting point is
http://www.hdrlabs.com/tutorials/index.html

--
Erik Krause