Hi all,
On Mon, 2012-01-30 at 13:16 +0100, Paolo Cavallini wrote:
> Hi all.
> Currently, loading coloured rasters with stretching to minmax on is extremely
> slow
> (almost unusable):
> http://hub.qgis.org/issues/4421
> E.g. I could load a large RasterLite in <1 sec instead of minutes (!).
> The trick, from the user point of view, is to disable stretching by default,
> and
> enable it only for rasters where the option makes sense (e.g. a monoband,
> greyscale).
> Obviously we could do it better, disabling the stretch for the rasters where
> it does
> not make sense.
> In addition, Giovanni noticed several other small bugs.
my notes are in the ticket.
There a few bugs (see ticket) and a couple of things need to be changed:
*) computing of stats takes a long time, it is easy to see that also
with not that big rasters it takes a lot, especially if multi-band,
hurting the user experience. The proposal is to make computing of stats
optional.
*) in the raster properties there are two properties ("contrast
enhancement" and "standard deviation") that have a button to save the
option in a way to allow the setting be persistent among qgis sessions.
This obviously should be moved to the general options, allowing to
override at a layer level.
cheers
-- Giovanni --
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