[Solved] GC TIFF compression is much less than Photoshop's?

[camner]

I compared GC's TIFF compression results with those of Photoshops. This is what I found:

Original uncompressed TIFF: 40MB
GC compressed TIFF: 31.9MB
PS compressed TIFF: 23.1MB

This is a significant difference!

I tried 4 different source files, and the results were similar. While this test was run using ZIP compression, I also tried LZW compression, and while the target file sizes were larger than with ZIP compression, GC's results were always significantly worse than Photoshop's.

Is this a result of the library used by GC to handle the TIFF compression?

[forum_adm]

Please email a file compressed by Photoshop zipped to support@lemkesoft.de for testing.

Thorsten

[camner]

I have sent you an email with a Photoshop compressed tiff file, as you requested. The attachment is 23MB, so I am concerned that it may be too large for the email system.

Please let me know if you did not receive the email + attachment, and I will find another way of getting the file to you.

[forum_adm]

Your file uses ZIP + prediction.
I added the support for this now.

Please download the latest BETA 5089:
http://www.lemkesoft.org/beta.html

Select in the TIFF options:

Screen Shot 2021-06-28 at 17.08.jpg (177.35 KiB) Viewed 919 times

The result is now nearly the same:

Screen Shot 2021-06-28 at 17.09.27.jpg (259.65 KiB) Viewed 919 times

Thorsten