8-bit exorbitantly slow when saving to disk

New Here ,
Jun 09, 2022 Jun 09, 2022

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Hey all,

 

my cam (Sony 7R m2) delivers 42mpx. An exported 16bit TIFF for Photoshop editing is about 250MB. Saving this 16bit TIFF in Photoshop lasts about 5-10 seconds.

Now, when i save this as 8bit, saving lasts 5-10 minutes. The result is a file of about 40-50MB.

 

Why is that? I'd assume saving 8bit should be much faster.

 

Oh, i tried saving as 8bit png, but still same issue.

 

What am i missing?

Thanks! 

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Cross-app workflows , Windows

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correct answers 1 Correct answer

Adobe Community Professional , Jun 09, 2022 Jun 09, 2022
Make sure all compression is off. As mentioned, the impact on save times can be dramatic. From those numbers, it sounds like compression is off with 16 bit, but on with 8 bit? LZW compression will in any case not work well with 16 bit data, if anything it will only make the file bigger. All else being equal, a 16 bit file should be roughly 2x the size of an 8 bit file.

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Adobe Community Professional ,
Jun 09, 2022 Jun 09, 2022

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If you use TIFF compression, that can increase save times. Obviously switching to fast NVMe SSD storage is much different than using an old, slow rotating hard drive. Computer speed, RAM, and scratch disk space are factors too.

I have a Canon 5Dsr (50MP files) and it definitely maxes out my 2015 iMac. I suspect that until I can update to an M1 Mac, there isn't much I can do to make a difference.

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Adobe Community Professional ,
Jun 09, 2022 Jun 09, 2022

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Make sure all compression is off. As mentioned, the impact on save times can be dramatic.

 

From those numbers, it sounds like compression is off with 16 bit, but on with 8 bit? LZW compression will in any case not work well with 16 bit data, if anything it will only make the file bigger.

 

All else being equal, a 16 bit file should be roughly 2x the size of an 8 bit file.

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New Here ,
Jun 09, 2022 Jun 09, 2022

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Thanks a lot, both of you. Yeah, compression was the problem, as I treid with ZIP compression only.

ZIP compresses 16bit MUCH faster than 8bit files. Thats weird, tho.

Anyway, turning off compression or using LZW behaves like expected. 8 bit saves faster here.

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Guide ,
Jun 09, 2022 Jun 09, 2022

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you should also disable compression in Prefs>File Handling

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Adobe Community Professional ,
Jun 09, 2022 Jun 09, 2022

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@Earth Oliver wrote:

you should also disable compression in Prefs>File Handling


 

For PSDs, which expect for very few users (mainly those working with ID), bring nothing useful to the party TIFF doesn't and only ensures fewer (non-Adobe) products can open that data. 

The OP is right to be sticking with TIFF. More why, (by Jeff Schewe) here:

https://forum.luminous-landscape.com/index.php?topic=18965.msg134830#msg134830


Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

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Adobe Community Professional ,
Jun 09, 2022 Jun 09, 2022

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There is no free lunch; smaller TIFFs and slower opening and saving. That said, if you want smaller TIFFs, if you use ZIP, it will be less compatible with other readers of the TIFF format. No an issue with Photoshop of course, but maybe an issue in the future with other products you may also use.

More here: http://digitaldog.net/files/TIFFvsPSD.pdf


Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

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