Compression of GeoTIFF - data destruction or not?

[Peter2]

See also here: viewtopic.php?f=35&t=36335&p=145491&hil ... ff#p145491

I have some TIF, uncompressed, realized by XnConvert as GeoTIFF. The new "save as TIF - CCITT4" creates a new, small file without messages or alerts - but after reloading XnConvert tells me only "TIF file", no more GeoTIFF. Is the Geo-data destroyed?

[xnview]

currently GeoTIFF are not supported

[Peter2]

currently GeoTIFF are not supported

So please add an option or a message to handle this situation:

Message / Dialogue:

"You want to modify a GeoTIFF which will result in lost of data. What to you want to do:
a) Continue this
b) Continue all GeoTIFF
c) Skip this
d) Skip all GeoTIFF"

[xnview]

could you send me a sample file?

[Peter2]

Thanks for checking it.
Here are some sample links from another posting:
viewtopic.php?f=35&t=36335&p=145491&hil ... ff#p145502

[Peter2]

Hi Pierre

something new with this?

Peter

[xnview]

something new with this?

sorry no

[Peter2]

Hi Pierre

is this topic on your list / on your focus, or does it have less priority?

[xnview]

always in my list but with a low priority

[Peter2]

version 1.40 of XnViewMp shows the files and the metadata very fine, but when I save it as "LZW compressed TIFF" the Geodata are lost.

Is there a way to keep them?

Edit:
maybe these tools can help / can be integrated?
https://gdal.org/