SUMMARY

Exporting/saving a file to TIFF makes the file size grow larger and larger on each edit/save operation. Resulting file size can be more than 10 times larger than required to store each pixel uncompressed. F.e. here comes result of "identify" such a file:

01_dir_org_mask.tif TIFF 1877x954 1877x954+0+0 8-bit Grayscale Gray 18.7867MiB 0.000u 0:00.000

While simple calculation  1877 * 954 * 1(byte) = 1790658, that is approximately 1.71MiB of uncompressed data, 10 times as little as existing size!

STEPS TO REPRODUCE
1. Open an uncompressed TIFF file
2. Paint a stroke or do some other editing
3. Save/export file.

OBSERVED RESULT
File size grows by 1MiB on each such iteration

EXPECTED RESULT
File size to keep the same size.

SOFTWARE/OS VERSIONS
Operating System: Ubuntu 12
KDE Plasma Version: 5.27.12
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13


ADDITIONAL INFORMATION