Resolve "TIFF import pixel rounding"

What does this MR do?

Fixes problems reported in #51 (closed) and changes behavior of TIFF images as proposed in #50 (closed)

Can this MR be accepted?

• I've read contribution guide
• Implemented
• Added/Updated tests
• Added/Updated documentation
• Pipelines passing

• Delete branch option set
• Fast-forwaded git merge is possible
• Added entry to CHANGELOG.md

Related issues

Closes #51 (closed), #50 (closed)