Questions tagged [rgb]
An image encoding scheme with three bands, one for each primary color.
153 questions
2 votes
1 answer
79 views
QGIS 3.34 replace rgb 255 255 255 color to another color for TIF
If I have an RGB TIF where some pixels have values of 255 255 255, how do I change the values of these pixels? The result will be an RGB TIF file where the original pixel values of 255 255 255 ...
- 73
1 vote
2 answers
130 views
Add an alpha band to a RGB GeoTIFF and make specific colors transparent using GDAL
I have a uInt8 RGB GeoTIFF file and the part of the TIFF is pure white (255,255,255) or pure black (0,0,0), all those area were considered no data and I want to make them transparent. I tried add ...
1 vote
1 answer
95 views
Extract RGB Values from Unique Values Symbology
I am looking for a solution to extract the RGB values from a layer that has a Unique Values symbology assigned in ArcGIS Desktop 10.8. These layers are geological units called "MapUnitPolys" ...
- 11
0 votes
1 answer
305 views
Convert a RGB LiDAR raster image to a greyscale height map in QGIS [closed]
I am fairly new to the world of GIS and also using QGIS. I normally use a greyscale height map to create a 3D terrain in external 3D software. I have a location where I only have access to a RGB ...
- 23
1 vote
1 answer
240 views
Coloring a QGIS Map with an RGB Column, and Creating a Legend that follows the same color
I'm working on a project in QGIS where I need to color a map using RGB values from a specific column in my dataset (RGB). However, I also need to create a legend that shows the units with their actual ...
- 13
0 votes
1 answer
184 views
Make a grayscale tif into a 4-band RGBA tif using gdal
I have a grayscale raster which returns the following information when I run gdalinfo on it Metadata: AREA_OR_POINT=Area Image Structure Metadata: INTERLEAVE=BAND Corner Coordinates: Upper Left ( ...
- 39
3 votes
1 answer
3k views
Converting image data type from uint16 to uint8 using Python
I have a uint16 image, but when I want to convert this image to uint8 data type, I get bad results. I'm sharing my entry image and the result below. My image is a 3-channel RGB image. original image: ...
- 75
1 vote
1 answer
660 views
How to convert Sentinel-2 RGB bands to [0, 255]
I have already downloaded the Sentinel-2 RGB bands using earthengine-api with python. The resultant numpy matrix has a shape (n, m, 3), representing the RGB bands directly downloaded from Sentinel-2. ...
- 31
0 votes
1 answer
393 views
Changing RGB band raster into single band raster in ArcMap
I have a raster like in this image, this raster symbology only consist of RGB Composite, vector field and stretched. How do I change the colors of this raster into a single color? This raster was ...
- 3
1 vote
0 answers
287 views
How do I create an RGB GeoTIFF using GDAL?
I'm trying to create an RGB GeoTIFF from an array. I've followed the question and response here, but I'm still having issues. When running gdalinfo on the image, the ColorInterp seem to be correct, ...
- 11
1 vote
0 answers
63 views
What are the shades (vertical lines) in the orthomosaics?
I am an expert on my field. I work with remote sensing. Mostly UAVs. I collect datasets and extract features from it. This year, I started collected with the Astro Freefly and the Sony A7RIV sensor (...
0 votes
1 answer
95 views
How calculating green canopy cover differs from the sensor utilized
I am an expert on my field. I work with remote sensing. Mostly UAVs. I collect datasets and extract features from it. One of the features is 'green canopy cover' (https://acsess.onlinelibrary.wiley....
-3 votes
1 answer
139 views
Which band is which in an RGB image
I have several RGB images of which I made an orthomosaic image. I would like to create a VARI vegetation indice. QGIS shows 4 bands in the raster calculator. Which band is which of the RGB bands? One ...
- 17
0 votes
0 answers
134 views
How to align orthomosaics in QGIS?
I have processed about 8 orthomosaics from UAV data collection. They used RTK for georeferencing, but I guess it was not done properly. They did not use GCPs. Therefore, the orthomosaics do not align. ...
1 vote
0 answers
89 views
Automating QGIS legend with RGB fields
I have a shapefile layer with R,G,B fields and used the following expression to set the symbol color. Surprisingly, it worked right away. However, even though the colors are applied in the canvas, ...
- 63