Questions tagged [rgb]

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

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10
votes
3answers
6k views

Using field-to-RGB mapping for symbology in QGIS?

Using QGIS version 1.7. I have a plain text file that lists a set of rgb values against a code. I want to use this colour table to colour a polygon layer by mapping one of its attribute fields ('...
0
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0answers
23 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 ...
1
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1answer
15 views

Can't view RGB image exported to Google Drive from Google Earth Engine

I am trying to export a clipped satellite image from Google Earth Engine's Code Editor. I am able to see the image correctly within code editor, but am unable to open the exported image in Google ...
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0answers
15 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 ...
1
vote
1answer
25 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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0answers
15 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))...
1
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1answer
54 views

Problem creating a GeoTIFF with RGB splitting image - R

I've like to split a RGB raster in multiple pieces and save each image in GeoTiff format, but in the file name I need the count of points (pts) inside each piece. My code runs perfectly when I used a ...
0
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1answer
24 views

Displaying composite raster in colors other than RGB in ArcMap?

I have a composite raster file with three bands in ArcMap 10.1. I am trying to display them in colors different than standard RGB. For example, I want band one to be blue, band two be brown and band ...
1
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1answer
37 views

Exporting RGB values from raster to file that can be processed in Excel using ArcGIS Desktop?

I have a 3 band raster file with RGB values (the Black Marble night time imagery from NASA). I want to get these values out and into excel so that I can plot them and hopefully see some sort of ...
1
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2answers
447 views

Adding RGB values to Laspy synthetic point generation?

What is the correct way to add RGB values to points made from scratch? Laspy is working great for me so far. I want to add RGB values to synthetic points that I've generated. I am using 2 numpy ...
1
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1answer
27 views

QGIS 3 - Polygon symbology RGB based on different columns

I want to symbolize several values from one layer using R, G, and B values. So, column 1 would be the blue aspect, from 0-255 based on min and max values, column 2 would be green, and column 3 would ...
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0answers
19 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 ...
4
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2answers
320 views

How to reduce number of raster bands of a RGB picture?

For my Master Thesis in Ecology I want to calculate an NDVI Index. The tricky part is, that I don't have sattelite pictures with bands and so on, but RGB pictures. The pictures where taken with a ...
0
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2answers
39 views

Commandline tool to change RGB value of GeoTIFF

I would like to change the rgb-value of raster-tiffs from 0,0,0 to 1,1,1. Is there a commandline-tool that can change the rgb-values of GeoTIFF files? At the moment I use irfanview to change the ...
0
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0answers
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 ...
0
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0answers
95 views

How read a raster [Tiff] file to get the correct values for every band? [duplicate]

I am trying to read a raster tiff [RGBA] file with GDAL in [C++], I can load the file, get the number of channels, the size of the bands and the metadata, but when I try to extract the Band [R, G or ...
0
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0answers
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'...
1
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4answers
1k views

Splitting RGB image into separate bands using Drone (DJI Phantom imagery)

Previously I have made marine habitat maps using multiband imagery and remote sensing techniques (e.g blue, green and red bands from satellite imagery). I am now attempting the same process however ...
4
votes
1answer
175 views

RGB TIFF goes black when zoomed out in QGIS?

Am importing a RGB TIFF into QGIS 3.4 and when I zoom in I can see the image properly, however, when I zoom out the layer turns black (most of it) and red (a small portion). After doing some search I ...
1
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1answer
340 views

Get colortable from three-band RGB raster (brick) with R

I have a three band RGB Raster Geotiff. I will provide the sample data below, but I'm guessing my problem should be solvable generically. I would like to turn this three band raster into a single band ...
2
votes
1answer
63 views

ERDAS Imagine signature picker colour changing RGB numbers?

I've noticed something with the signature picker in ERDAS and I was wondering if it is a bug or a feature. When I create classes I assign a colour to make them easily readable in the classified ...
1
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1answer
129 views

Load a SAGA RGB composite in QGIS

I have created a RGB composite in SAGA GIS using the RGB composite tool. A one band raster is created, which can be visualised in SAGA using the option RGB coded values. When I try to import this ...
3
votes
1answer
232 views

Changing default color palette from RGB to CMYK in ArcMap?

Is there a way to change the default colour palette in ArcMap? Currently, for each symbol, I have to change RGB to CMYK to choose my colour (see screenshot). This is pretty annoying since all my ...
10
votes
3answers
3k views

Raw Sentinel 2 jp2 to RGB geotiff

I'm looking for a way to merge Sentinel 2 jp2 band files(B02, B03, B04) and fix RGB colors. All should be done with bash or python script. For my example I work on these images. Ideally the solution ...
1
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1answer
2k views

How to determine the bands from an aerial image?

I received a set of aerial images taken with a Canon camera, I don´t know which kind of lens it has, or if it has been modified. After performing split image algorithm in Qgis, I get four new files: ...
2
votes
1answer
3k views

Open and split a 4 channel RGB picture

How can I split an 4 channel rgb pic in qgis? With the value tool I can see 4 channel. I tried to use the RGB to PCT tool but I always get an error (File "C:\PROGRA~1\QGISBR~1\bin\pct2rgb.py", line ...
9
votes
1answer
11k views

Extracting raster cells from imagery based on RGB value using ArcGIS Desktop?

I've got some aerial photography (format: IMAGINE Image) which is detailed enough to see to fire hydrants and a shapefile of fire hydrants which was digitized based on some CAD data. My project is to ...
1
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0answers
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 ...
2
votes
0answers
130 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
votes
2answers
116 views

generate vector lines of planting from a raster uav image

I have a high quality drone image and I want to generate the planting line from raster. I will transform rgb to false ndvi or others index. The vector lines must go through the green areas of the ...
2
votes
0answers
233 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
votes
0answers
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 ...
2
votes
1answer
5k views

Convert JPG image to RGB Raster to Vector Data

I am completing an analysis project for my ArcGIS class. I am analyzing the correlation between indigenous populations and food security in Guatemala. Since there is not a lot of information out there ...
1
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0answers
148 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 ...
6
votes
2answers
12k views

Convert specific RGB (GeoTIFF) color to transparent

I have an RGB GeoTIFF file and I want to convert a specific RGB colour to transparent. I would like to use GDAL for doing this, but external Python scripts are also an option (though I haven't learned ...
4
votes
1answer
6k views

Merge RGB band using python

I need to merge the RGB bands of three TIFF images. I'm trying to use a PIL library (Python Imaging Library), but this execution error happens: Traceback (most recent call last): File "merge.py", ...
16
votes
3answers
548 views

Why does my rainbow airplane stripes appearing on Sentinel 2 image?

I have downloaded a Sentinel-2 scene and there are some interesting rainbow like stripes trailing an airplane. This is an rgb image but the stripes are also visible on the other bands. You can tell it ...
1
vote
1answer
2k views

Landsat True color in QGIS [duplicate]

I have download the following Landsat 7 image LE07_L1TP_231095_20011014_20170202_01_T1. I want to open a true color RGB composition using bands 1, 2 and 3. For that, I import the Tiff files of the ...
3
votes
1answer
863 views

Digitizing RGB TIFF automatically using ArcScan

Is it possible to digitize RGB TIFF by color? I need to select all the vegetation cover types from the image below, which is a part of an aerial photography of an island (http://george.wildlifeintel....
1
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1answer
78 views

Is it possible for Orfeo toolbox to do auto object identification on a 3band RGB raster image?

My intention of using Orfeo Toolbox is to find all the open air basketball courts on a raster image with 3 bands RGB. Does OTB require a multi spectral band image or is 3 band image good enough to ...
1
vote
1answer
225 views

What's the default histogram manipulation of QGIS for displaying RGB images?

When you open an RGB geotiff (e.g. bands 4-3-2 of Sentinel-2) as raster dataset in QGIS - what histogram manipulation is applied by default? Of course I can look at the min-/max-values, but I'd like ...
0
votes
2answers
907 views

Extracting color values from layer to build index using ArcPy/ArcMap?

My university wants the maps we create to become more standardized and so we're changing all the colors on our base vector map. The new standard needs to be indexed and I have the task of creating ...
0
votes
1answer
53 views

Seeking software to pick up rectangular shape of basketball courts?

Is there any software/plugins for remote sensing or object orientated classification for my 3 band aerial image? I want the program to be able to pick up open air basketball courts or badminton courts ...
2
votes
2answers
1k views

Creating visually standardized RGB images from Sentinel-2 data

I want to create "visually appealing" RGB images from Sentinel-2 L1C data in a standardized manner. Obviously, this starts with extracting the bands 4, 3, and 2, which correspond to the Red, Green, ...
9
votes
1answer
3k views

Symbolizing using RGB values from Excel in ArcGIS Desktop?

I have an excel file with 2 attribute columns, 1-feature info 2-Number of color (RGB) that the current feature should be symbolize. This file file can be joined with the layer using the "feature info" ...
0
votes
0answers
383 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(...
2
votes
0answers
151 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, ...
1
vote
1answer
155 views

PyQGIS: apply a graduated renderer with RGB

I'm trying to apply a graduated renderer on a point layer. I found this code here (the first in the solution) and slightly modified it to my project. It seem's to work beautifully (in the layer ...
2
votes
1answer
6k views

How to create an rgb GeoTIFF file raster from bands using the GDAL python module?

I'm trying to create a new raster from three bands (rgb). I got the script mostly from here. I can create a single band raster with no problems, but I'm having trouble inputting a tree band numpy ...
1
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0answers
109 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 ...