There is a sample of this data at:
http://www.ordnancesurvey.co.uk/docs/sample-data/10k-raster-colour-sampl
e-data.zip
If you turn this grayscale in 1.9 it just turns grey (rgb 127,127,127)
all over. In 1.8 if you choose grayscale it displays it with the rgb
values displayed below.
So I created a colormap if anyone is interested. I took the values from
what QGIS 1.8 did automatically to turn the data grayscale.
Value - r ,g ,b
0 = 255,255,255
1 = 0,0,0
2 = 226,226,226
3 = 150,150,150
4 = 218,218,218
5 = 232,232,232
6 = 232,232,232
7 = 230,230,230
8 = 249,249,249
9 = 252,252,252
I have created a qml file if anyone would like it you can download it
from here:
https://docs.google.com/open?id=0B6r5nAOdEBZrRFpjVlBLZm1BSkE
This was quite easy as there were only 10 values defined in the data.
The OS 25000 and 50000 rasters have 255 different colours in them.
James
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Nicholas Pearson Associates |
T: | M:
http://www.npaconsult.co.uk/
-----Original Message-----
From: qgis-user-boun...@lists.osgeo.org
[mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of James Stott
Sent: 19 June 2012 14:40
To: Etienne Tourigny
Cc: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] QGIS Master and Rasters to grayscale
Yes.
It still turns into one colour.
James Stott BSc (Hons) MSc | Senior Professional Nicholas Pearson
Associates | 30 Brock Street | Bath | BA1 2LN
T: 01225 445548 | M: -
http://www.npaconsult.co.uk/
-----Original Message-----
From: Etienne Tourigny [mailto:etourigny....@gmail.com]
Sent: 19 June 2012 14:33
To: James Stott
Cc: Salvatore Larosa; qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] QGIS Master and Rasters to grayscale
DId you click on "Load" Button?
On Tue, Jun 19, 2012 at 10:22 AM, James Stott
<james.st...@npaconsult.co.uk> wrote:
You can still do that by selecting "singleband gray", and choose the
default contrast enhancement in the options.
This just turns the raster into 1 gray colour: 127, 127, 127
can you share a bit sample of your raster?
Technically I don't think I supposed to share the data as it is
Ordnance Survey data.
I have included the metadata below if this helps:
Driver:
GDAL provider
VRT
Virtual Raster
Dataset Description
N:\Projects\10499 BP\Reference\Base Mapping\Raster\10000\OS 10000.vrt
Band 1
STATISTICS_MAXIMUM=9
STATISTICS_MEAN=3.2746921074487
STATISTICS_MINIMUM=0
STATISTICS_STDDEV=3.9133672791329
Dimensions:
X: 39370 Y: 31496 Bands: 1
Origin:
385000,95000
Pixel Size:
0.635001,-0.635001
No Data Value
-32768
Data Type:
GDT_Byte - Eight bit unsigned integer
Pyramid overviews:
Layer Spatial Reference System:
+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000
++y_0=-100000 +ellps=airy +towgs84=375,-111,431,0,0,0,0 +units=m
++no_defs
Layer Extent (layer original source projection):
385000.0000000000000000,75000.0000000000000000 :
410000.0000000000000000,95000.0000000000000000
Band
Band 1
Band No
1
No Stats
No stats collected yet
James Stott BSc (Hons) MSc | Senior Professional Nicholas Pearson
Associates | 30 Brock Street | Bath | BA1 2LN
T: 01225 445548 | M: -
http://www.npaconsult.co.uk/
http://www.npaconsult.co.uk/http://www.npaconsult.co.uk/about-news.asp
From: qgis-user-boun...@lists.osgeo.org
[mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Salvatore
Larosa
Sent: 19 June 2012 13:02
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] QGIS Master and Rasters to grayscale
Il giorno mar, 19/06/2012 alle 12.42 +0100, James Stott ha scritto:
This does make what was a very simple thing to do in 1.8 more time
consuming in 1.9 doesn't it? All I want to do is just turn it
grayscale for display purposes. In 1.8, all I do is select grayscale
from the colormap drop down and push OK and QGIS does it for me. Am I
missing something?
Hi James,
can you share a bit sample of your raster?
Regards,
-SL
--
Salvatore Larosa
linkedIn: http://linkedin.com/in/larosasalvatore
twitter: @lrssvt
skype: s.larosa
IRC: lrssvt on freenode
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