TIFF Compression after rotation

[arxiv]

1. Using XNView 2.49.3 (May 15 2020) on Windows10.
2. "B&W TIFF image(CCITT G4 compression)" changed to LZW compression(8bit color) after rotation.
3. How can I get "CCITT G4 compression TIFF image" after rotation ? When I rotate by 90 degrees, this does not happen.

4. [Tools] > [Options] > [Read/Write] > [Write] > [TIFF] settings are below:
Colour compression --> LZW
Binary compression --> CCITT G4
All checkbox --> off

regards,

[xnview]

When you rotate image, image is no more in 1 bit per pixel, so you need to convert it before

[arxiv]

Thank you for reply. I got it.