P: TIFF compression settings have no effect when Lightroom sends image to Photoshop for editing

118,880 KB - 106,208 KB = 12,672 KB or about 12.7 MB.
Chris, that's a lot of metadata–What kind of PS metadata are you referring to? The file I tested is from a Canon 5D MKII CR2 with only default LR adjustments applied.

It never worked for me, even on clean OS install. What I know, it only works when ACR version is different, so LR renders the TIFF itself. Looks like it's more of a PS problem then.

Photoshop is writing more metadata into the file than Lightroom, so the files it writes will be slightly larger due to that metadata.

Using LR5 beta I did an Edit In PS CS6 'Let LR Render' and then I Saved As a 2nd file from inside PS with no compression, and Saved As a 3rd file with ZIP compression. Very strange results:

LR Render with ZIP: 106,208 KB
PS Save As with ZIP: 118, 880 KB
PS Save As with No Compression: 124,625 KB
LR Render with ZIP & Save As with ZIP in PS: 118,880 KB

I would have expected the two ZIP files to be identical. All three have identical document sizes (120.3MB), resolution (5616x3744), 16 bit mode, and ProPhoto RGB profile. My LR Preferences External File Handling is set for 16 bit, ProPhoto RGB, ZIP Compression. Any ideas?

Interesting...

Perhaps it is related to the operating system (do you use Mac or Win?), and/or the combination of LR and PS, and their versions.

Also: In your case, does LR or PS render the TIFF? Perhaps it works correctly when LR renders the TIFF and this is indeed a communication problem between LR and PS, so that PS does not get the information correctly how to compress the TIFF when saving it.

It seems to work perfectly for me. When I edit with "none" selected under compression, the resulting TIF is 46.8MB. When I do the same with "ZIP" selected, the resulting TIF is 27.4MB. If I edit the ZIPed version and save it from PS, the resulting image is 33.2MB, indicating to me it must still be compressed.

Windows 7 64, LR5.

Adobe is the developer of both Photoshop and Lightroom and they wouldn't have added a feature like this in LR if it doesn't work in PS. Does it work for anyone out there?

Doesn't this seem like a problem with the save settings in PS, rather than an LR problem?

Bug is still present in LR 4.4 and LR 5 beta, too (Win 7, 64 Bit, with PS CS6 64 Bit with ACR 8.1b). The compression setting in export works, but not in "Edit in PS".

Thomas, I have the same issue as posted here in the LR forums:

http://forums.adobe.com/message/46637...

This problem still exists with LR4.1 when using PS CS6, at least on Windows 7 64 bit systems.

In addition, the TIFF ‘Byte Order’ is set to ‘Macintosh’ (Big-endian) instead of ‘IBM PC’ (Little-endian), which is what LR’s Export module uses. So, there is a clear “inconsistency” concerning byte order implementation and a definite “bug” in that the compression setting is not applied when using ‘Edit In’ PS.




Adobe Photoshop Lightroom Team please add to the bug list for correction.

Thank you for your assistance.

Best Regards,

Todd Shaner