[R-sig-Geo] zlim argument image() does not work

[Edzer Pebesma]

you didn't provide a reproducible example so I couldn't check, but have
you tried:

image(d1, "band100", zlim=c(0,1), useRasterImage = FALSE)

?

On 12/08/2011 06:49 PM, Carsten Neumann wrote:
> Dear developers,
> 
> the zlim argument in image() or image.plot() can be used to change the
> scale of the colorlegend. But this has no influence on the image that is
> plotted. Typically z values (Pixels) allocated to image data should
> change colors regarding min and max placed on the legend. But the
> plotted colors remains the same independently from changing
> colorlegends. Is this a known bug or did I overlook a detail:
> #############################################################################
> 
> sessionInfo()
> R version 2.14.0 (2011-10-31)
> Platform: x86_64-unknown-linux-gnu (64-bit)
> 
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
> 
> other attached packages:
> [1] plotrix_3.3-1 fields_6.6.2  spam_0.27-0   rgdal_0.7-5   sp_0.9-91
> 
> loaded via a namespace (and not attached):
> [1] grid_2.14.0    lattice_0.20-0
> ################################################################################
> 
> d1<-readGDAL('NMS1_blue_neu.img')
> 
> image.plot(d1,"band100",col=rainbow(200),zlim=c(0,200))
> image.plot(d1,"band100",col=rainbow(200),zlim=c(0,1))
> 
> ###means the legend is changing but the visualization of the images
> keeps the same and that is not a correct behavior###
> 
> The same behavior I could observe in Raster Objects!
> 
> Best regards
> 
> Carsten
> 

-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de