I am trying to import and export a greyscale land cover .tiff image in Manifold. When I import the .tiff - Manifold converts it to RGBa. And even if I convert it to a paletted image in Manifold - it exports it as RGBa, when I export as .tiff or .bmp or whatever.

Is there any way to keep a greyscale image as such for import and export? I don't want to lose the land cover classes as defined in greyscale through all of the conversion into RGB...

Thanks for any help.

blackbird88

The Image Types user manual topic may help. I imported an RGBa image, used the Image - Convert to command to convert it into a grayscale image, and then exported it to tiff. Importing it into PhotoShop indicated it was still a grayscale image. Importing the tiff back into 8 and it was still a grayscale.

Thanks Dimitri. It was in QGIS that the exported paletted image was being read as RGBa - so perhaps that's where I need to troubleshoot the import.

blackbird88

If you convert to 16-bit greyscale in M8, then export, then the (mis)interpretation options elsewhere become more limited.

Try that?