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Old 21-11-2021, 07:33 AM
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alpal
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Join Date: Jan 2012
Location: Melbourne
Posts: 3,597
HDR pictures for beginners.

I did an experiment yesterday to take a high dynamic range picture
from a suburban backyard.
I put my DSLR camera on a mini tripodon a tableand took
exposures of different lengths.
I made sure there was a bright white chair in the foreground
to make it as difficult as possible.


Later on -

I used Automatic mode in Photoshop to stack 3 frames –
of different exposure lengths -

done in only a few seconds -
see attached photo.

see how to do it here:
https://www.picturecorrect.com/tips/...-in-photoshop/
and here:
https://www.garmahis.com/hdr-photoshop-cs5/

to remove ghosting from the tree leaves moving between frames.
It’s a lot better than manual stacking with masks -
but still some artifacts on the large picture.
Photoshop does it all in a few seconds – very clever software.

It was not possible to do an exact job with the exposures done as the wind was blowing enough to make the leaves move on the tree between exposures.

You can also see that the sky is not even blue without a variable

exposure layer addition in Photoshop.
The white chair back is completely washed out to 255 out of 255 with the 8 bits but is measuring ~233 out of 255 after I used a 1/4000 second frame in Photoshop for it.

Even though I put my mobile on HDR – high dynamic range - it couldn’t cope with that and I already knew it was technically impossible as I had to go to my fastest speed
of 1/4000 of a second on the DSLR to get that chair in without over exposure.
Isn’t the human eye amazing? – we can see the whole picture clearly even with such a huge dynamic range.
Cameras cannot do that so 3 different exposures had to be added in Photoshop to make the picture look like the human eye sees it.


Larger version of picture here:
https://i.ibb.co/d2sD6zF/Dynamic-range-comparison-1.jpg




cheers
Allan
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