Before considering giving up, I believe it would be best to open the TIF Blend and Water masks in GIMP and export them precisely as cited here:
https://www.fsdeveloper.com/forum/threads/cant-get-water-to-show-at-airport.460289/post-936014
https://www.fsdeveloper.com/forum/threads/resample-tool-not-working.448011/post-847770
"
For SDK Resample compatibility in source images output by PhotoShop and GIMP, ensure 'output' options meet the following criteria:
When
Day / Seasonal variation "
visible" source images are '
Saved' as a
24-Bit color *.BMP, configure the file format with:
* "Run Length Encoded" (aka "RLE")
NOT checked
* "Do
NOT write color space information"
checked
* "
24-Bits" (R8 G8 B8) '
ticked'
When
Blend and Water Mask 'data' source images are '
Saved' as a
8-Bit gray-scale '(256)-color-step' *.TIF, configure the file format with:
*
NO compression, whether FAX - CCITT 3, Huffman Encoding, LZW, PackBits etc.
* RGB
NOT CMYK
*
NO ICC sRGB Color Space Profile Embedded
* Optimized
NOT Custom Palette"
I researched this fairly extensively a few years ago, and of what little I recall, there 'were' settings in GIMP dialogs to control all output parameters.
I do not use GIMP or PhotoShop (I use Corel PhotoPaint, which reads file info, but may not have certain output parameters controls to 'fix' this).
So, for best tests of TIFF file format compatibility, the onus is on
you to ensure optimal SDK compliance (although FS2Kx SDK docs failed us here).
IMHO it is possible vague conclusions in forums about FS2Kx SDK Resample "tolerating" / "ignoring" TIFF status / alert messages ...are
not correct.
IIRC, there are scenarios where TIFF status / alert messages are associated with custom PR LC malfunctions even though Resample still writes BGLs.
So, although I am prepared to test further, it may save me time and effort to know results of
your tests with Masks made precisely to SDK specs.
GaryGB