Questions tagged [rgb]

An image encoding scheme with three bands, one for each primary color.

24 questions with no upvoted or accepted answers
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158 views

Add RGB values from CPT file to Int16 GeoTIFF using Python and Gdal

I want to add color, using RGB values stored in a CPT file, to a black and white Int16 GeoTIFF file using Python. I tried to use SetColorEntry(), but when I add the ColorTable to the RasterBand, I ...
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0answers
199 views

Converting 8-bit RGB tif to single gray-scale image

I have a tif image of soil thorium content (ppm) measured by gamma aerial spectroscopy. The original file is a 8 bit RGB image set in a rainbow-similiar pallet (blue>green>yellow>red>magenta). I have ...
2
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0answers
53 views

Display final desired color with RGB + transparent grey hillshade

In QGIS 2.18.16, I am trying to end up with a final desired color specified in RGB (from a style branding book of a client). The map also contains a hillshade with some transparent grey over top of ...
2
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0answers
274 views

Reprojecting xyz rgb file in QGIS?

I am trying to reproject an XYZ RGB point cloud file that I got from a drone mapping software. It is now in WGS84 and I want it in euref32(UTM) or just a local metric system so i can import it Into an ...
2
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0answers
178 views

ENVI shows colors of different RGB code the same in a bitmap image wrongly?

As you see in this picture which I've captured in MATLAB, there are two colors. Red with the RGB code (255,0,0) Brown with the RGB code (138,139,1) I've tried to show the same picture in ENVI, ...
2
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0answers
674 views

Pansharpen Landsat 7 RGB using gdal_pansharpen.py

Is it possible to pansharpen Landsat 7 RGB band combination (without NIR) to have approximately the same intensities as the original RGB image with gdal_pansharpen.py (weighted Brovey algorithm)? What ...
2
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0answers
500 views

How to match the colors of different RGB mosaic rasters?

I am beginner in QGIS. I want to classify many RGB rasters (see picture) but their colors don´t match. As you can see, the green polygon shows the same land cover class (meadow) but in each tile the ...
1
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0answers
53 views

r raster:: extract band (integer) values from raster buffer without taking the mean

I want to extract values from my RGB raster, which are in the buffer(zones) of my 14 station points data. So far the values are extracted with the raster::extract by taking the mean of some values ...
1
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1answer
70 views

How to extract contours from .jp2 DEM dataset?

This will be a little long-winded but I'm including all information I consider relevant. Problem: I have received a data set from a municipality that is a 3-layer LiDAR JP2 DEM and need to extract ...
1
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0answers
110 views

Converting uint16 RGB&NIR geotiff image to a uint8 RGB geotiff?

I am trying to convert a uint16 geotiff image with 4 bands (RGB&NIR) with LZW compression to a uint8 geotiff image with 3 bands (RGB) without compression. Here is what I have tried: ...
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0answers
28 views

Hiding NoData values of a raster in MapServer

In a MapServer NoData value pixels can be hide by using the following code inlcusion in a mapfile: `PROCESSING 'BANDS=3,2,1'` Now I have raster with multiple combinations of NoData Values other than ...
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0answers
32 views

Light normalization of Orthophotos to increase comparability

I would like to work with the RGB-values of different orthophotos. Now I noticed that the light conditions are not the same in the different orthophotos. I was wondering if there is a sound way to ...
1
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0answers
164 views

Changing raster display in QGIS to look same as ArcGIS Desktop?

I have a strange problem. I have noticed that the same satelite imagery looks totally different in QGIS and ArcGIS. The problem is that I need to get the same style in QGIS. I've tried to calculate ...
1
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0answers
129 views

How to clip a RGBA raster with another single band raster using QGIS or GDAL

I have a RGBA raster and I would like to set all the data over the continents to transparent. I have a single band raster where land is equal to 0 and ocean is equal to 1. Normally if I had a single ...
1
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0answers
101 views

What can POLYCOLOR mean and is there a way to convert to RGB?

It is not for the first time I found in the tables of some data column called POLYCOLOR. Is there any way to figure out what that means and is it somehow convertible to RGB values? If I get it right ...
1
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0answers
162 views

How to change area inside mask to different RGB Value in ECW Format with FME

I have 3 Band RGB ECW Raster files and would like to change all the RGB values within the masked area to 0,0,0. I am using the SpatialFilter to set the masking area and thought that I could use the ...
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0answers
20 views

Convert 1-band .nc file to GeoTiff with RGB

How can I convert 1-band .nc file to GeoTiff with RGB? I have tried using gdal translate but it won't let me apply color interp of RGB to the .nc as it has 1 band.
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0answers
9 views

How to export specific RGB values from rasterimage

QGIS issue here. I have a rasterimage (ECW), and want to export only the stribes from the road to a new rasterfile, even better to a vector from specific RGB numbers. The ECW file is 700 MB, but when ...
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0answers
61 views

Determining average RGB values of raster layer image inside selected polygon

I have a layer which contains a number of polygons(around 10,000). My work is to check the imagery layer colour inside of that polygon and write a colour in the 'Ceiling_ID' field based on its average ...
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0answers
28 views

Seeking high resolution real-color (RGB imagery) dataset?

Specifically interested in the the South Florida region, USA. The aim is to pull up high quality aerials to detect manholes and wellheads from space! These things can typically be half a foot to a ...
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0answers
64 views

Adding RGB values from a .txt file to a .las file using laspy

I have a text file that has XYZ and RGB values in it. To convert it to .las format i use lfile = laspy.file.File(r"D:\las\tolas.las", mode='w',header=LasHeader(x_scale=0.01,y_scale=0.01,z_scale=0.01))...
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33 views

No data values after raster export (force RGB)

I have a problem when I export a raster (DEM here after). I use the same parameters as the original with "Use renderer" and "Force RGB". But the RGB contains no data values. And obviously, I don't ...
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0answers
452 views

Plot RGB raster on basemap in R

I want to plot my RGB raster on a basemap in R. So far I have a RasterStack object and I have downloaded the basemap with ggmap. I can plot them individually but not together. stack_rrs <- stack(...
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0answers
632 views

Plotting shapefiles with Pyshp in Python omits some shapes

I want to plot a cloropleth map of Scotland with Pyshp, but only a fraction of the shapes are plotted. The shapefile of Scotland has 32 shapes, and it is available here. The values dictating the ...