Saving between LR and PS 2020 even in Tiff

Question

I have raise this question few days ago, having the reply was to change the setting in LR, the external setting from PSD to Tiff. As your advice is in PSD the file cannot exceed 2GB.
 
After the change, seems alright but actually not. This afternoon I editing some photos, as usual first in LR and go to PS 2020. Problem occured again if there are many layers or editing in PS. The program told me that the Tiff file size was exceeding 4GB and cannot be saved back to LR for my further re-touching.
 
In the old days just before the up-dating of both LR and PS, this is not a problem. Complicating editing or large number of layers in PS is very common and seems this will always exceed the limit. 
 
The selling point of LR and PS is the powerful editing and can from here to there very easily and now seems malfunction.
 
Hope can hear your good news very soon.
 
Regards

Abambo · Answer

The 4 and 2 Gb limits are natural limits that can't be easily overcome. 4Gb is the biggest 32-bit-unsigned-number you can have. 2 Gb is the limit of 32-bits-signed-numbers. For a long time those limits where incredibly high. As you can't simply p1mp up 32 bits numbers to 64 bits without breaking old(er) code, we will have to live with this. Adobe has introduced the PSB file format for very huge files (some time ago) to cope with this.

BTW: Adobe is also the inventor (via Aldus, a predecessor of today's Adobe) of the TIFF format. Therefore you find the TIFF specs on the Adobe site.

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