Q: I'm trying to convert a TIFF file made from Draw into a rasterfile format (for, e.g., an SGI IRIS). All the TIFF converters I know of complain about an invalid TIFF format. What's going on?
A: NXWriteTIFF() writes out data and alpha as one strip, not two separate strips; alpha is assumed to follow the data. But, the TIFF standard says that in this case (samples per pixel of 2) there should be 2 StripOffsets, not 1. So the file is not considered valid.
A workaround is to load the file into Icon and save it, ideally without Alpha Channel. (Saving with Alpha will lead to many display devices getting confused, because of the photometric interpretation value of 5.
