Questions tagged [rgb]

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

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124 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 ...
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50 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 ...
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230 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 ...
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139 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, ...
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130 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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487 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 ...
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448 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 ...
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29 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 ...
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144 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 ...
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107 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 ...
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93 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 ...
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157 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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8 views

Using NDVI along with regular RGB and NIR bands for image classification

Is it plausible to use NDVI along with other regular bands for image classification related data processing? Recently, I came across a comment that RED and NIR band might interfere with NDVI or vice ...
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11 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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18 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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17 views

Use of RGB images for plant health classification

GRVI is the greenness index of vegetation, which is certainly not the replacement of the NDVI. However, can anyone justify the use of GRVI from RGB images, for the classification of vegetation using ...
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20 views

RGB image file to Y'CbCr and other Luma+Chroma Representations

is it possible using QGIS on windows to convert an RGB image file to Y'CbCr and other Luma+Chroma Representations format. I've seen various formulas for this written in MATLAB and R. I am looking to ...
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37 views

GeoTIFF pixel value interpretation

I'm currently working with a GeoTIFF file of a RapidEye image, which I'm reading in using GDAL. When I read in the RGB bands (which I believe are the 1-3 bands), I get values uint16 values that doesn'...
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378 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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470 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 ...