PHOTOSHOP: I noticed abnormal banding while merging images as HDR (32Bit).

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  • Updated 4 years ago
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I merged 5 images to HDR in photoshop. I used 32bit format. I noticed abnormal banding in my images, which I have not seen in anyother software programes. I have the latest version of Adobe Photoshop cc.
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gokulagiridaran Mahalingam

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Posted 4 years ago

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Chris Cox

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What do you mean by "banding", and where are you seeing it?
What were the input images?
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gokulagiridaran Mahalingam

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A -> steps to reproduce

1. select the images of different exposures and click merge to HDR pro in photoshop
(use lightroom or bridge)
2. In the Merge to HDR Pro dialog box, choose the mode as 32 bit
3. Click complete tonning in Adobe camera raw
4. The image now opens as smart object in camera raw.

B -> see the attached image for the banding.
C -> See the original image, where ther
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Chris Cox

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That's called ghosting, because you had things move between the exposures. And in that case even ghost removal may fail (in most HDR programs) because the clouds moved so much between exposures.
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gokulagiridaran Mahalingam

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Ghosting is not the concern. Are you able to see the wave forms in the image? thats called as banding.
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Chris Cox

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No, there is no obvious banding there. There are some lines in the water that could be due to qualization (8 bit display) or motion of the water. The biggest problems I see in those photos are the ghosting from moving clouds.
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gokulagiridaran Mahalingam

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Ghosting can be fixed. I am not concerned about that. The image what, I share is just an example.

- You are right, from 32bit file , I have to open it in 16bit mode to have levels, curves working.
- Do you know how to fix this problem, when we change the modes?
- OR is it possible to get the levels, curves working for 32 bit files?
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Chris Cox

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Apply your toning while still in 32 bit/channel, and convert to 8/16 bit/channel only when you're ready to output the image.

Levels does work in 32 bit/channel, but Curves can't work too well with an infinite range of data.
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gokulagiridaran Mahalingam

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- My work flow is based on luminosity masking, I need curves. ;-(

When I convert the image to 16 bit, I get a dialogue box to merge or not to merge the images. Do you what is the difference?