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TIFF files doubling in size

Forum|Forum|3 years ago
November 19, 2022
2 replies
2425 views

I have seen my saved TIFF files double in size recently to around 100MB even though I ensure I flatten all layers before saving - I use the LZ compression option too. It started in the version 22 and has continued in versions 23 and 24

Help!

macOS

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Correct answer D Fosse

Are your files 8 or 16 bits? LZW compression doesn't work well with 16 bit data and will often just increase file sizes.

PECourtejoie

Community Expert

Hi, @Mike Pountney Can you install both versions of Photoshop, and convert the same file in both apps with the very same parameters, and report here (a view of the finder with the 2 files could be a good proof of the issue.)

Please also report all settings used. I could then convert this thread to a bug report.

M

Mike PountneyAuthor

Participant

Hi

So I loaded up the same RAW file to the latest version of Ps (v24.01) and saved as a TIFF file which stored as 114 MB

Then I downloaded the oldest version of Ps being offered (v22.2) and when I saved that as a Tiff file it loaded at 121MB

These are both about double the size that I was getting a few months ago

It occurred to me that the RAW converter file has been upgraded a few times recently - currently on version 15.0

Could that be creating these much larger TIFF files

Unfortunately The Creative Cloud doesn’t offer older versions of the RAW converter.

If this is the problem is there a way to overcome it?

Thanks

Mike

Per Berntsen

Community Expert

Check your workflow settings in Camera Raw, they are listed at the bottom of the screen.

If it says 16-bit, click the text to access the workflow settings and change to 8-bit.

If your doing heavy editing in Photoshop, it is recommended to use 16-bit. You can always convert to 8-bit later, or even better, keep the 16-bit file, and convert a copy to 8-bit if needed.

D Fosse

Correct answer

Community Expert

Are your files 8 or 16 bits? LZW compression doesn't work well with 16 bit data and will often just increase file sizes.

M

Mike PountneyAuthor

Participant

They are 16 bit - I sample my new files in Adobe Bridge first and select the images I want to work on in Photoshop.

The only thing that is different is the versions of Bridge and Photoshop have changed.

Thanks

D Fosse

Community Expert

Maybe your files used to be 8 bit and are now 16? That's a doubling of file size. I can't see what else could have changed. A pixel is still a pixel, and compression algorithms haven't changed that I know of.

In any case, as I said, if you have 16 bit files, don't use LZW compression. At best it's not effective, at worst file size goes up.

There was a bug, recently fixed, that applied (RLE) compression to PSD/PSB even when it was turned off in preferences. I don't know if also affected TIFF. But since you already are using compression, I don't see how that can apply here. And it didn't produce a halving of file size.

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