HDR for Glare Analysis

hdri
1

Hi there:
I have a question that concerns HDR photo and Glare analysis.

Can I use Adobe Photoshop CC (which has the Camera Raw plugin) to prepare
my HDR images?
after that calibrate it with the use of HDRSCOPE that is proposed by Mehlika
Inanici. Instead of Photosphere?

2

Hi there:
I have a question that concerns HDR photo and Glare analysis.

Can I use Adobe Photoshop CC (which has the Camera Raw plugin) to prepare my HDR images?
after that calibrate it with the use of HDRSCOPE that is proposed by Mehlika Inanici. Instead of Photosphere?
Regards
Fatemeh
M.Arch
University Putra Malaysia

3

Hi Fatemeh,

I do not know wether the dynamic range of the raw images you get from your camera matches the requirements of what you intend to do with those images. The wide dynamic range in typical daylid scenes led folks here to use exposure series. About the software, I have some doubts that Adobe will tell you about the internals of their HDR code. So it will be difficult to get support or any information about the meaning of pixel values in the resulting images. Does Adobe claim the resulting HDR images to have physically correct values?

Cheers, Lars.

···

Hi there:
I have a question that concerns HDR photo and Glare analysis.

Can I use Adobe Photoshop CC (which has the Camera Raw plugin) to prepare my HDR images?
after that calibrate it with the use of HDRSCOPE that is proposed by Mehlika Inanici. Instead of Photosphere?
Regards
Fatemeh
M.Arch
University Putra Malaysia

4

While you *might* be able to use Adobe's CameraRAW processor to convert the original images to JPEGs, later to be combined using hdrgen or similar, Lars is right that Photoshop itself does not maintain absolute photometric calibration throughout its processing.

Adobe actually hired me to improve their HDR image merge process, so CS3 and later (I think) derive a camera curve and maintain correct relative values in the images, similar to Photosphere, but I never convinced Adobe to include calibration information in their output. So, you would need to include a gray card or something whose luminance you measured when you captured the image and use this to correct the final output using a scale factor. (It is usually a good idea to do this, anyway.) The procedure for doing this can be found on Mehlika Inanici's site, and also in other posts to this mailing list.

Cheers,
-Greg

···

From: "Lars O. Grobe" <[email protected]>
Subject: Re: [HDRI] HDR for Glare Analysis
Date: April 17, 2014 3:14:35 AM PDT

Hi Fatemeh,

I do not know wether the dynamic range of the raw images you get from your camera matches the requirements of what you intend to do with those images. The wide dynamic range in typical daylid scenes led folks here to use exposure series. About the software, I have some doubts that Adobe will tell you about the internals of their HDR code. So it will be difficult to get support or any information about the meaning of pixel values in the resulting images. Does Adobe claim the resulting HDR images to have physically correct values?

Cheers, Lars.

Hi there:
I have a question that concerns HDR photo and Glare analysis.

Can I use Adobe Photoshop CC (which has the Camera Raw plugin) to prepare my HDR images?
after that calibrate it with the use of HDRSCOPE that is proposed by Mehlika Inanici. Instead of Photosphere?
Regards
Fatemeh
M.Arch
University Putra Malaysia