[GRASS5] d.photo

[Markus Neteler]

On Wed, Apr 23, 2003 at 11:55:38AM +0200, Radim Blazek wrote:
[...]
> It means that G_get_null_value_row() takes more than 230% 
> of the time required for  G_get_c_raster_row() (if NULLs not read).
> It must be possible to improve performance of G_get_null_value_row()
> but rasters are not my hobby.
> 
> BTW: It seems that raster values are masked by NULLs in current region
> resolution instead of original raster map resolution. I am not sure if it is good.
> That is probably more general problem of conversion of rasters to current region.

There was some time ago a discussion on NULLs

http://grass.itc.it/pipermail/grass5/2001-June/000307.html

Maybe interesting in this context.

 Markus