Preview of iSRD corrections of entire frame

SilverFast HDR Studio (48bit HDR processing)

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Preview of iSRD corrections of entire frame

Postby stevebow » Sun Jul 26, 2015 8:44 am


I am scanning negs at roughly 5000x3500 resolution. When previewing iSRD correction later in HDR Studio, I must use either 1:1 or HQ preview modes. As I understand it, this zooms in the image so that each screen pixel corresponds to each source image pixel 1-to-1 i.e. magnification is 100%, as indicated in HDR Studio below the magnifying glass zoom icon. In this mode I can see the original image, corrected image, or IR "Marks" in red. This is fine, but because of the very large source file dimensions, I see these in a highly zoomed-in image on the screen.

What I'd like to be able to see is the iSRD corrected image (or the red Marks) for the entire source image at the same time. The tooltip for the "Normal" zoom (which then shows the entire image, with 29% magnification indicated) says that the "...adjustments are not visible". Is there any good reason why this is so? It seems to me to be quite logical to be able preview the results of iSRD for the entire image and not just a small zoomed-in portion? In HQ preview mode the entire corrected image is already calculated anyway, so why can't these results then be visible for the entire image in "Normal" zoom mode? Or am I missing something?


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Re: Preview of iSRD corrections of entire frame

Postby LSI_Ketelhohn » Mon Jul 27, 2015 4:13 pm

Dear Steve,

The infrared channel has a much lower resolution than the RGB channel.
So the two need to be aligned properly to produce correct results.
This alignment is quite difficult and one of the things that can be checked in 1:1 Preview.
A lower resolution unfortunately would not allow to see the correct result.
Also some defects are so small they would not be visible in a lower resolution.

Therefor it is necessary to view the result at the actual 100% view.

Kind regards,
Arne Ketelhohn.

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