Questions tagged [color]
The property possessed by an object of producing different sensations on the eye as a result of the way it reflects or emits light
455
questions
0
votes
1
answer
39
views
Setting the background color when plotting in GeoPandas
I am wondering if there is an easy way in GeoPandas to change the background color of a plotted map. Here is my code; I can't figure out how to change the white background color to any other color. ...
- 101
0
votes
0
answers
10
views
Converting HSV raster to RGB in R
Problem:
I want to convert a Hue, Saturation, Value (HSV) raster to the RGB color space. I have already successfully converted from RGB to HSV, but I'm having trouble with the reverse.
I'm using the ...
- 105
1
vote
1
answer
37
views
Uploading transit data to QGIS
I'm in QGIS and I've got a map of all the bus routes. The only problem is that they are all one layer, and I can't color each route individually. There isn't a property (as far as I can tell) that can ...
- 11
1
vote
1
answer
63
views
Making world map with terrain colours in QGIS
In QGIS I would like to create a world map that has terrain colours (e.g., deserts or vegetation), as in the attached map (Gehring et al. 2022), particularly for the African continent.
How should I ...
4
votes
1
answer
198
views
Is there a way, in QGIS, with an expression, to convert a color to hexadecimal value?
Is there a way, in QGIS, with an expression, to convert a color to hexadecimal value?
Or eventually to convert an integer to hexadecimal
like
to_hex(255) → FF
- 348
4
votes
2
answers
120
views
Loading multiband raster layer with pseudocolor style (not RGB) using PyQGIS
I am loading a raster file with many bands to my QGIS project.
layer = self.iface.addRasterLayer(raster_file_path, baseName="foo")
By default, QGIS chooses to set its symbology to "...
- 10.7k
0
votes
1
answer
66
views
Changing Arcpy Message-Warning-Error Text Colors
I recently came across a post about changing "the default error color in python" and was interested in doing something similar with Arcpy's AddMessage, AddWarning, and/or AddError functions. ...
- 1,290
1
vote
1
answer
106
views
Changing color and font for cell in QgsLayoutItemTextTable object using PyQGIS
I am in the process of creating, with PyQGIS, a PDF file.
First I set up the following objects:
A value project = QgsProject.instance()
A layoutManager object "manager"
A QgsPrintLayout ...
2
votes
0
answers
49
views
QGIS coloring of label background based on variable does not work
I want to change the background color of particular labels from my layer to mark them. Therefore I use a CASE structure inside the expression editor, that corresponds to this filling color. See first ...
- 21
0
votes
0
answers
25
views
Colouring of a pie chart
How can I automatically insert different colors for different attributes in creating pie chart in QGIS. I have multiple attributes and coloring them differently takes alot of time. Is there way that I ...
- 1
1
vote
0
answers
90
views
QGIS changing layer colors [closed]
I'm having a problem with several QGIS projects. I style and format the vector layers, save, and when I reopen the project another day the formats are changed. All the vector layers appearing in blue ...
- 19
1
vote
0
answers
49
views
QGIS 3.32 and printing colored text
I spent time looking for a solution but found none. Most were dated from years ago.
If I am in QGIS using the Python console and Python editor how then do I get text to print in various colors or with ...
- 19
1
vote
1
answer
56
views
How to convert HSL to RGB in Earth Engine (Python)?
I have 3 Images representing HSL (Hue, Saturation, Lightness) attributes of a single image. I would like to display them as a single RGB image, meaning I would like to create 3 separate bands with R, ...
- 39
0
votes
0
answers
22
views
Is it possible to make a True Color RGB with 2 VIS band and one IR band?
I want to create a True colour RGB. I am working with MODIS L1 images. For some circumstances, the only bands that I have available are:
Band 1 (620 - 670) (VIS)
Band 2 (841 - 876) (VIS)
Band 22 ...
- 1
0
votes
0
answers
35
views
How to change the nodata value in mosaic
When I add a raster to a mosaic dataset, the NoData value becomes black. How to change the NoData value back to transparent? I want to create a cache file and upload it to ArcGIS Online. If there's ...
- 125
1
vote
0
answers
64
views
QGIS legend different colors
I want to edit my legend in QGIS 3.28.6 manually (see picture).
Is it possible to output the individual legend elements in different colors?
For example OK Sand should be green and Grundwasser should ...
- 31
2
votes
1
answer
107
views
QGIS: Changing labeling color within label
I have a point layer in QGIS that looks like the following picture:
Content of the Dicke Auf field :
BS 4/ DPM 4
Ansatzhöhe: 275.96
UK Auffüllung: 274.71
Dicke Auffüllung: 1.3
OK Sand: 274.62
...
- 31
2
votes
1
answer
88
views
Error in RGB to HSV conversion in R: "cannot use this formula, probably because it is not vectorized"
I'm trying to convert a bunch of small rgb rasters (3 channels) into hsv rasters using the raster package in R, similar to the suggestion here:
QGIS - RGB multiband to HSB(HSV?) multiband
It has ...
- 21
3
votes
1
answer
182
views
How to apply the Four Colour theorem on GeoJSON feature collection with Leaflet
Imagine you have a GeoJSON feature collection of adjacent colored polygons presented in a Leaflet map; in the present case the parishes of the city of Lisbon
fetch('https://geoapi.pt/municipio/lisboa/...
1
vote
0
answers
52
views
Select a feature and show all its neighbor with different color
I want to select a feature and show itself in specific color, at the same time I want to show all its neighbor in another color, by this way I can check the neighbor relation clearly. My code is as ...
- 11
4
votes
3
answers
566
views
Changing polygon color depending on visibility of background map in QGIS
I have a map with borders and different "background maps", e.g. OpenStreetMap and Google Satellite. When the Google Satellite Map is in the background, the borders are the best visible in ...
- 519
7
votes
1
answer
126
views
pyQGIS Applying pseudo color ramp to an image destroyes the symbology in layers panel
I use the following code to apply pseudo color into a NDVI raster.
rlayer =layer = iface.activeLayer()
#stats = rlayer.dataProvider().bandStatistics(1, QgsRasterBandStats.Range)
#min = stats....
- 73
1
vote
0
answers
100
views
Unify the colors of a raster - from satellite imagery
I'm performing analyses based on pixel values on a Raster, which is a satellite image from 2014 (.tif format). This satellite image is exported from Google Earth and georeferenced in QGIS.
The ...
- 489
7
votes
3
answers
671
views
Styling contours by colour and by line thickness in QGIS
I commonly deal with new areas where I would like to quickly visualize contours. My aim is to be able to apply a style that contains a color ramp from the lowest to highest values but also to show all ...
- 1,401
0
votes
0
answers
26
views
Inherit feature color from another feature automatically with ArcMap
I'm working on a "Ftth" project and there are many repetitive tasks. So, I have to connect the house to the closure through a wire. Whenever I give a color to each closure, the link and the ...
0
votes
0
answers
41
views
Bug with QGIS colors and Ubuntu
I'm having a problem with QGIS colors. The first thing I do is select a layer by double clicking and then another click on "single fill". The problem is about the 7 bars on the right, whose ...
- 1
0
votes
0
answers
19
views
Codes for facecolor that match map colors in OrRD
I've created a map in OrRD using .plot in GeoPandas. However, I need to label my legend. I've tried using the .legend command and this seems to create a new legend. The code that I'm using is as ...
0
votes
0
answers
100
views
QGIS raster fill color change
How I can change the color of a Raster fill in QGIS? I need to change it from black original to a RGB green code.
- 11
2
votes
2
answers
97
views
Open QgsColorDialog and modify feature in @qgsfunction from expressions
Is it possible to open a QDialog (here a QgsColorDialog) and modify layer's feature when executing a QgsExpression with a qgsfunction such as :
@qgsfunction(args="auto")
def label_annotation(...
- 1,097
0
votes
0
answers
12
views
Negative Rrs on SeaWiFS file
I'm working with the following file "SEASTAR_SEAWIFS_GAC.20030716T122701.L2.OC.nc"
Which can be accessed through here: OceanColor-Nasa-URL
After accessing the Rrs I noticed that there seems ...
- 1
0
votes
0
answers
68
views
Why is my code changing the labeling for my legend?
By default, the legend that is created from a layout includes a label with the field name. However, when I run my Python script to change the symbology of a layer, the label is changed to include the ...
1
vote
0
answers
121
views
Color a tile while creating in PostGIS
I am trying to create a tile using PostGIS. Although I am able to create a tile but facing difficulty when coloring it. I want to color the tile means I want to color the geometry with different ...
- 145
0
votes
0
answers
19
views
Cluster recognition to adjust aerial imagery colour
I have infrared imagery (as 1km tiles at 20m resolution) of the whole of England. However, the imagery was captured at different times so there are clear discontinuities in the colour between some ...
1
vote
1
answer
481
views
Converting Landsat 8 RGB bands to 8-bit colors
I generated composite images of Landsat 8 SR images using this Google Earth Engine collection, and for a machine learning project now I need to transform the RGB bands of these images to 8-bit colors.
...
3
votes
0
answers
340
views
Expression to get symbol color from categorized layer in QGIS
I want to get the color of a categorized symbol to be used as background color of a textframe in the printcomposer. The color has to change automaticly when the feature-name changes.
Is there an ...
- 5,237
2
votes
1
answer
266
views
Loading color map from TXT file into raster layer using PyQGIS
I need to configure a pseudocolour symbology of a raster image using a colour map file in txt format using PyQGIS, how can I do it, and what class allows me to access this configuration?
This can be ...
- 1,284
5
votes
1
answer
364
views
Getting color of feature using PyQGIS
QGIS offers the @symbol_color-variable in some places. But it is missing at various places of data-defined-override/field-calculator dialogues.
I tried to create a own function, but it returns wrong, ...
- 551
0
votes
1
answer
572
views
Color-code a Leaflet GeoJSON polyline based on additional values [closed]
I almost repeated Color-code a Leaflet polyline based on additional values, e.g. altitude, speed, because after more than eight years, I have not found a satisfactory answer.
I need a gradien color of ...
1
vote
0
answers
45
views
Fill in Basic Colours in Qgis
I'm trying to fill in a TIN interpolation to be a full 1:2 rectangle. When the interpolation is finished, the areas with no land cut off in the corner leaving it transparent, which causes issues for ...
- 11
1
vote
0
answers
143
views
Can't set label background nor callouts color to the the variable @symbol_color
Working with QGIS 3.22.8 you can set a data defined override for label color to match that of the associated feature using the variable @symbol_color, but it does not work for label background fill/...
- 31
1
vote
1
answer
57
views
OpenLayers - how to create 2 different colors from one color?
So I am using asArray() to create rgba color from color provided as a string. I noticed a very strange behaviour when I create two colors from same orginal string. It seems like they both reference ...
- 113
3
votes
1
answer
488
views
QGIS - list with clear name colours
One may use data defined override in order to set symbol colours. The expression editor says, the expected format would be
string [r,g,b,a] as int 0-255 or #AARRGGBB as hex or color as color's name
...
- 15.7k
1
vote
1
answer
431
views
Extract Raster Value around point on QGIS
I'm using QGIS and I'm triyng to extract raster values around some points that were created from a .csv file.
I already could extract the raster values in each point but each point represents an ...
- 25
0
votes
0
answers
17
views
Automatically assigned marker colors for markers within a group too similar, anyway to get unique colors assigned?
Automatically assigned marker colors for markers within a group are too similar, is there anyway to get unique colors assigned?
I could go through the symbology of each marker and manually change them ...
- 1
1
vote
1
answer
381
views
Changing color of all layers in geopackage at once in QGIS
For a project I am working in QGIS all the layers within a geopackage need to be the same color.
Is there a way I can change the color of all the layers to same color simultaneously or do I need to ...
- 357
2
votes
1
answer
455
views
Set linestring color by property value in PyQGIS
I have a GeoJSON layer consisting of some LineStrings. Each feature has a color property:
{
"type": "featureCollection",
"features": [
{
"...
- 145
1
vote
1
answer
76
views
Extract Corine Codes from QGIS to an .csv
I'm doing a project and I need to extract the Corine Codes to a csv accordingly to a set of points. I have already mapped these points on QGIS in a .csv format (with latitude and longitude) and I ...
- 25
1
vote
1
answer
304
views
Using QGIS default Random Color Ramp in Categorized symbology using PyQGIS
Based on this code below, is it possible to use Random Color option in Symbology?
layer = iface.activeLayer()
field_name = 'zona_manejo'
field_index = layer.fields().indexFromName(field_name)
...
- 703
4
votes
1
answer
352
views
Removing black lines in between shapes in QGIS
In QGIS 3.22.7 I have a large dataset consisting of small square geometries (for reproducibility, a sample of this data can be downloaded from here; the total file size is 9 KB for all of them).
When ...
- 101
3
votes
1
answer
732
views
Including legend data in attribute table in QGIS
What I want is a legend that also includes a table of data related to each legend item.
The obvious way I see to do this is to build an attribute table that includes a column with legend info. But how ...
- 31