Questions tagged [rgb]

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

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1answer
38 views

Downloading only one band in Google Earth Engine without the RGB bands

I have calculted the NDVI of specific plot and download it in order to run analysis in QGIS. The image on GEE had only one band: the calculted NDVI, but whenever I open it on QGIS I have 4 bands: NDVI ...
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2answers
33 views

Exporting RGB values using ArcGIS Desktop?

I am working in ArcGIS 10.6 Desktop. I have several polygon shapefiles where the symbology is set to unique values. The amount of distinct values per shapefile is between 10 and 40. I assigned special ...
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0answers
7 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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1answer
36 views

Stack 3 layers and display them as one in GEE

I have used this code https://www.gears-lab.com/intro_rs_lab8/ in order to learn and practice my SAR-1 skills. I have created an almost similar code, but few things are not clear to me regard this ...
2
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1answer
42 views

Detecting and deleting alpha mark in QGIS

I got a couple of 4 band images, band 1-3 is RGB and band 4 is NIR. In the properties it says nothing about an alpha mark, does that mean that none of them is marked as alpha channel or how do I ...
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1answer
90 views

Plot RGB using rasterio

When plotting and RGB image using rasterio, I have seen that it is necessary to normalize the values first (0-1) and the use show. I am using the following code for that: def norm(band): band_min,...
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0answers
52 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
46 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
26 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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1answer
31 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
21 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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1answer
101 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
41 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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1answer
65 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 ...
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1answer
32 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 ...
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1answer
74 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 ...
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1answer
37 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
25 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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2answers
86 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 ...
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0answers
28 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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0answers
304 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 ...
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0answers
45 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'...
4
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1answer
215 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 ...
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1answer
406 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
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1answer
106 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 ...
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1answer
189 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 ...
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2answers
664 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 ...
3
votes
1answer
291 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 ...
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0answers
30 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
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0answers
162 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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2answers
130 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
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0answers
52 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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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 ...
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0answers
155 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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1answer
3k 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 ...
16
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3answers
631 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
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1answer
87 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
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1answer
247 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 ...
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1answer
55 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
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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, ...
11
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3answers
4k 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 ...
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0answers
415 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
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0answers
252 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
168 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
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1answer
179 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 ...
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0answers
123 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
vote
1answer
549 views

Export RGB data (from a tiff image) in excel format

I have a tiff file having 3 bands R, G, B. I used the following program in R to obtain the pixel values for each band separately. r<- raster("lena.tiff", band = 1) writeRaster(r, filename = "...
2
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0answers
136 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
549 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 ...