Processing images with more than 256 bands (hyperspectral)?

[erdmann]

Hi John,

I'm processing some 257-channel hyperspectral images (256 reflectances and a mask) and I encountered an error message that simply says "bad bands". I see that comes as a hard-coded limit of 256 bands here: arithmetic.c.

I would also like to start using vips to process raw files from our macro-XRF setup, which implies a need to deal in 4096-channel images.

The .v file format specification allocates 4 bytes for the band count, but I assume that the 256-band limit comes from 1 byte being allocated to store the band count somewhere internally. Is this a limitation that would be straightforward to extend?

Many thanks in advance.

[jcupitt]

Hi, I removed that limit, it was just there for programming convenience. If you come across any more, please let me know.

[erdmann]

I owe you so many beers. Thanks!