Photoshop CS6: Problems converting from 32 bit/channel to 8 bit/channel

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  • Updated 4 years ago
  • (Edited)
Image displayed and edited at mode 32 bits.
Editing finished - attempts to change mode to 8 fails.
Instead the HDR drop down window comes up & corrupts the image.
The mode still can't be changed.

Help please - I've had to go back to original NEF file.

Ron Silvester
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Ron Silvester

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Posted 4 years ago

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Chris Cox

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Which product are you using?
Which version? Have you installed all the updates?
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Ron Silvester

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Thanks for your prompt reply Chris,
I've just installed a new version of CS6, Purchased last week. Version: 13.0.1 x64
I've just run 'upgrade' again, as I write & am informed all is up to date as of a minute ago.

Installed onto Win 8.1
ASUS G750JZ - 32GB RAM -512 SSD + 1TB HDD
And etc

I've run other images to test and the same is happening with the Mode set at 32.
Once set it can't be changed, other than when it is reset to either 16 or 8 bit, the HDR window pops up and the image is corrupted. Cancelling the HDR window returns the image to as it was but there is no way I can figure, to get out of Mode 32bit! Very annoying.

Is this likely to be something I've done in the couple of days since I installed CS6 or is it a problem with the application. I'm still in the process of installing this new machine and tranferring from an XP 32bit machine.

Hopefully you might have suggestion for me to try?

In anticipation,

Ron Silvester.
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Chris Cox

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OK, so it sounds like the HDR toning preview is somehow showing bad results - that could be a video driver issue. (especially since the Win 8.1 update reverted the drivers for many people -- get the updated drivers from the GPU maker's website again)

And are you using 32 bit/channel mode for HDR imaging? If you start with an 8 or 16 bit/channel image - you don't really have HDR data.
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Ron Silvester

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Thanks Chris,

I had done some HDR processing on the image but can't remember what Mode I'd used at the time. The three different images I've tried with the same results were handled in the same way, including the short term memory lapse.

I'll go for the upgrade drivers for the NVidia GTX 880M as well, as you've suggested but I shouldn't be finding too many upgrades or updates as this machine is fresh off the assembly line. I'll let you know if this changes things and I'll also try a virgin RAW image to see what happens.

Regards,

Ron Silvester.
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Chris Cox

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Remember that the drivers that come with Windows are often years out of date -- it is best to update them from the manufacturer's website (in this case the GPU maker).
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Ron Silvester

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Thanks again Chris,

NVidia update(?) Did an update to version 332.60. Didn't notice what it was before the update though. With your help, my Win OS and NVidia are updated as of today anyway.

Ran a virgin raw image through its paces and the same thing happened with the HDR pop-up/drop down when I tried to change the Mode settings; except when the file was processed/converted as a '.png' When converted to a PNG file format, all went well: Mode settings were normal and etc. PSD & Tiff failed the mode tests. I'm not familiar with this PNG file specifications, so I remain curious about this Mode hassle scenario.

Image concerned is attached with my compliments (as a JPG), for the second time Chris. I have to wonder what happened to the first time because I turned my back to work on the other computer while my reply to you was supposedly on the go and when I turned back a few minutes later, my reply containing the above and the image, had vanished. I can't find any trace of it so I've reduced the dpi to 72 and will try again.Maybe I didn't press the right button or something. Anyway, if you get two replies that are similar, you'll know why.

Thanks again for helping to educate my fumbling fingers to this new system, machine and OS.

Regards,

Ron Silvester.
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Chris Cox

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Well, PNG doesn't support 32 bit/channel - so you had to have an 8 or 16 bit/channel image to save as PNG.

"HDR pop-up/drop down" - not sure what that means. When you convert from 32 bit/channel floating point data down to 8 or 16 bit/channel integer data, you get the HDR toning dialog that asks how you want to compress the range of the HDR data down to an LDR image.