Questions tagged [rgb]

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

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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" ...
6
votes
2answers
11k 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 ...
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 ('...
4
votes
0answers
315 views

Symbolizing vector features using RGB values stored in three fields using ArcPy? [duplicate]

I need to symbolize a vector layer in Arcmap based on RGB (or HSB - can do either) values found in fields in the attribute table. I'm working with up to 10 different datasets, each with over 100 ...
7
votes
1answer
2k views

Can I export the RGB values from an ArcGIS layer symbology?

I've got a point layer in ArcGIS that has 100 specific color codes based on the name of the store. I'm trying to export the RGB values for these colors (along with the name value it's tied to) so I ...
4
votes
1answer
1k views

Using RGB values stored in field of feature class to apply colour component for ArcGIS Pro symbology?

Symbolizing using RGB values from Excel in ArcGIS Desktop? and Symbolizing vector features using RGB values stored in three fields using ArcPy? are questions that distil to whether it is possible to ...
2
votes
1answer
2k 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 ...
1
vote
1answer
478 views

How to prevent RGB composite flatten to 1 band after raster calculation

I have a series of landsat wanting to process in raster calculator, but after doing the tool it happened these output images only contain one single band. They used to be RGB 3-band images. It is on ...
0
votes
1answer
1k views

Displaying LiDAR data with RGB values in ArcGIS Desktop?

I have been able to display LiDAR data with RGB values out of aerial photos with SAFE FME and also POTREE. Is there any way to do this with ArcGIS 10.3?
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 ...
5
votes
3answers
7k views

How to extract X Y coordinates and RGB from pixels using python in QGIS?

I'm trying to white a Python plugin in QGIS (2.2) to get, for each pixel of a raster image, its X Y coordinates, as well as, its RGB (3 bands) values. At first I opened the raster file using: rlayer =...
6
votes
2answers
967 views

Extracting RGB values from aerial photo and assigning to LAS file with FME?

I need to extract the RGB Values from imagery and assign to a .las file in order to display 3d landscape with "real" colours. I have an unlicenced LAStools, FME 2017 and ArcGIS 10.3.1 at hand. I ...
1
vote
1answer
1k 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
993 views

Extract all unique values from a RGB raster

I have a .png file in RGB format showing the intensity of ship traffic: For my analysis I need to convert it to a one-band raster with values between 0 and 1 where 0 means lowest density and 1 means ...
2
votes
1answer
1k views

Interpreting GeoTiff pixel values using Python GDAL?

I was running python script that queries a GeoTiff file at the coordinates of a centroid of blocks and as a result I got a list of pixel values, which I have trouble interpreting. When I run gdalinfo ...