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

75 questions with no upvoted or accepted answers
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228 views

How to display a line with fading transparency in qgis?

I have a straight line with two vertices, which I'd like to style. I want the style to be a fading line from start to end, so the transparency is gradually increasing from start to the end of the line....
4
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1answer
112 views

Style rule based on feature adjacency?

Is there a way in QGIS to use an expression to define a polygon feature's color based on whether it's adjacent to other features? I would like to achieve something like the following: -If a feature ...
3
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0answers
56 views

Setting transparency color in Expression Builder

Using QGIS 3.16, I am trying to set color through expression builder, using #RRGGBBAA format. The problem, I was using the same color, let's say '#94AFDCff', it should return the same color as '#...
3
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1answer
30 views

Applying a Single Gradient Fill Color to a multipart feature

So I have an indicatrix covering a world map for the purpose of illustrating distortions for different projections. I want the circles of the indicatrix to share the same gradient fill color, as ...
3
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0answers
353 views

QGIS 3 heatmap, on screen color ramp with data scale

When making heatmaps in qgis 3.0.1 i would like to place the color ramp with percentage and actual numbers for the bin borders on the map. Each marker under the color ramp represent a percentage of ...
3
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0answers
470 views

How to do color correction when mosaicing and clipping with gdalwarp

I'm mosaicing a number of GeoTiffs with gdalwarp and clipping to a geojson area of interest using the following command: gdalwarp -of GTiff -cutline <PATH_TO_GEOJSON> -crop_to_cutline -...
3
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0answers
196 views

Changing colours in SVG symbol using QGIS?

I am using QGIS version 2.14.1 (Essen), and I have imported a traffic cone symbol in SVG format to represent some of my data. I was wondering if it was possible to change the color of this symbol ...
3
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0answers
275 views

Applying unified color scale to tiles with gdal2tiles?

Background: I have a series of about 40 small GeoTIFFs that need to be merged together to make one large image. Each GeoTIFF has 2000 bands. I've tried using both gdal_merge and gdal_retile to pull ...
3
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0answers
262 views

PyQGIS: How to color raster layer with existing colorBrewerMap

With pyqgis I have added multiple new raster layers to the legendinterface(). Because i like the ColorBrewer style i want to color some of them with the "Spectral" gradient. How can I do this in ...
2
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0answers
49 views

Generate N distinct colors which (alpha) blend in a nice manner when overlaying an orthophoto or a map

I have N polygons (let N = 3 for making it simple) to display onto a base map in an OpenLayers application (but this can also naturally be applied to other GIS softwares as well). For the moment, I ...
2
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0answers
32 views

Adding colour range to grid in QGIS

I am doing some mapping for vegetation monitoring across a site. I have divided the property up into quadrats using the create fishnet grid function at the size I wanted. I have then intersected it ...
2
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0answers
12 views

Solving color correction of LISS IV Multispectral image

I have a LISS IV multispectral images (radiometric resolution of 10 bit per pixel) taken in different months 4 tile in January and 2 tiles taken in February. While mosaicing, I got a different color ...
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64 views

Changing color symbol legend by field

I changed the color of the polygon symbology with a specified field. Now, I need to categorize the symbology for better data management and to be displayed on a map. But, this not change the legend ...
2
votes
1answer
60 views

Creating color ramp based on quantitative range

I have a set of polygons with correlation values. I would like to color each polygon based how strong their correlation value is where 0=lightest and 1=darkest. This means if I have a set of three ...
2
votes
1answer
664 views

Merge *.png files into one using GDAL

I built a Python script that downloads tiles from some map service. This service cannot be imported to QGIS as a tile layer so I decided to download tiles directly using requests module. The script ...
2
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0answers
50 views

Selecting annotation by color to correct Annotation Class using ArcPy?

I have some municipal data that was converted into a GIS and all of the address numbers were coded as dimensions in the annotation feature class. There is an annotation class for address, but none of ...
2
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0answers
122 views

Unifying color scale of different tiles in Google Earth Engine?

I found some other posts asked the similar questions but in different tools like ArcGIS, GDAL, QGIS etc. What I want to ask is how to do this in GEE. Now I have removed the bad observation pixels (...
2
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3answers
822 views

Multiple overriding rules for styling in QGIS 3.4.0

I am a total beginner to QGIS and still struggling with the basics. After a quick research on this forum I could not find the answer to my current issue. What I am trying to do is to colour the ...
2
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0answers
139 views

Changing color according to attribute from another layer using PyQGIS?

I have township polygons on a first layer and landmark points on a second layer. I would like change the color of each township polygons when landmarks points are missing. I can already select one ...
2
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0answers
961 views

Increasing size and changing color in centroids, lines, and polygons

In the QGIS python console, I am able to get the active layer with layer = iface.activeLayer() but I need to be able to change the size and color of both centroids and polygons. For a polygon layer, ...
2
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0answers
207 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, ...
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0answers
95 views

Select features tool- QGIS 2.14

When i select polygon with select tool- the whole polygon colored: i seek a way to select the shape only with outline, as it possible in ArcGIS. I know i can change the opasitiy in "Map Tool" but ...
2
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0answers
117 views

How to make water transparent on openstreemap-carto style?

I have build up manually a tile server on Ubuntu 14.04. LTS, by following switch2osm's guide and have used the openstreetmap-carto style. Now I intend to add a base layer, underneath the current one,...
2
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0answers
170 views

Random color ramp issue

I have one set of polygons and one set of points sharing a common attribute (value 0-503). When applying style with new random color ramp (Categorized) the first set of polygons is displayed ...
2
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0answers
983 views

Convert grey,green,blue to red,green,blue tiff

==== Edit ===== Issue tracked to strange behaviour of gdal_warp when -dstalpha is specified and source is RGBA. I had assumed that the grey,green,blue tiffs (see example below) were genuine and ...
2
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0answers
433 views

Inverting color ramp in legend

I have inverted the color ramp to display land surface elevation, now when I add a legend in print composer it shows the lowest value at the top and the highest at the bottom. See below: It is more ...
2
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0answers
206 views

How to optimize color ramp for terrain

I'm working on a project to highlight LiDAR terrain on the web and part of the idea is to show the detail of the data at large scales. I've already read through the excellent Mapbox guide and I've got ...
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0answers
24 views

Coloring heat map, with custom characteristics

I need to color a "heat map", with these characteristics: "Pseudocolor monoband", "Discrete" and with two levels: <= "STATISTICS_MEAN" -> Color 255/255/...
1
vote
1answer
98 views

Use multiple colors in the same OpenLayers label

I made the following code that assigns a style to the field labels. Now I would like each word or group of words in the label to be a different color previously selected by the user. For example if we ...
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0answers
43 views

Importing colour map from .text file which will then correspond to geologic shapefile on QGIS 3.10.6

I have been searching for this solution for over a week now and have tried many of the suggested solutions online but so far northing has worked. I have a Geology vector layer and a corresponding RGB ...
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0answers
42 views

Customize color pallets widget

I use some color palettes (1) that I added through QGIS settings and I would like to know if it is possible to customize how these palettes are displayed in the Layers Properties or any popup widget ...
1
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0answers
73 views

Export to PNG produces wrong color background (but not for JPG)

I need to export a map as a PNG image, but when I do the background, which is supposed to be white, comes out gray. This also happens when I export it as a TIFF or EMF, but not as a JPG. I have tried ...
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0answers
85 views

Continuous colour gradient within line segments in a vector layer

I am new to QGIS (using version 3.13) and my main objective with it is easy to explain: creating a line vector (multiple points, representing a river) in which the colour of the line changes based on ...
1
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0answers
77 views

ArcGIS Pro .pdf export - Colors are wrong

I am exporting a .pdf map from ArcGIS Pro (2.5) and the coloring is coming out completely different when I open it in in Adobe Acrobat. (Pictures below) It seems like this is only a problem on my ...
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0answers
58 views

Color-blind preview export

There are many ways to preview a map as it is seen by people with color vision impairment. ColorOracle, preview mode in QGIS, etc. But none of these options allow exporting the modified image, only ...
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0answers
409 views

How to export shapefile with colours from QGIS

I want to export shapefiles from QGIS. The shapefiles have been colored by category, but when i export them, the exported files does not have colors, but only the lines that divide the categories. I ...
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0answers
159 views

QGIS raster image leaving original colors intact

I'm using a program that generates a map using a set of colors (radio signal strength ranges, to be specific). It outputs the file as a jpg image with KML, so it displays perfectly well in Google ...
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0answers
49 views

Change the color attribute of a mulitline layer

I'm very new in world of the shapefiles, i have a code that add point in a multiline layer, but when i open with ArcGis each layer have a different color, and i want that all the layer have the same ...
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0answers
38 views

How to add automatically a color for a query made in Access

I made an Access database with my polygons and my Exceltable with data about floods. I linked the specific row to my shapefile table and made a query table of it. With the manual way I gave the ...
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0answers
25 views

Automatically give colours to shapefiles in different layers

I'm in the final stage of my floodmap and I want to colour the River basin districts based on the Total floods in the area. When there are 0 floods it has to be white, 1-2 floods -> green, 3-5 -> ...
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0answers
68 views

How to calculate color distances in raster data in QGIS?

I have to compare aerial photographies with geomagnetic data. The photos are georeferenced scanned slides showing structures on the surface. The magnetic data have a certain unit, but the photos do ...
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0answers
320 views

Changing colors in SVG file polygon using QGIS?

I try to change colors and lines width in this polygon (this is SVG file): I learn from here SVG symbol colors differences in QGIS 2.12? Using SVG file to fill polygon using QGIS- problem to add this ...
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0answers
60 views

QGIS how obtain multicolour lines from polygon cell grid multicolour

In QGIS I have different lines with same colour that pass through a grid polygon cell (each cell of the grid have a colour). When a line cross a cell, it must colour with the relative cell colour. ...
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0answers
44 views

Export color corrected rasters from a catalog in arcmap

I have several raster in a raster catalog for which I(ve used color correction. I'de like to export each raster as a geotiff with exactly the same resolution and world file than the original geotiff ...
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0answers
97 views

Convert manual colored maps to vector

Is there a way to colorimetrically and automatically vectorize georeferenced rasters that came from manually colored, scanned maps? Currently we Print the topography maps 20k scale --> hand-coloring ...
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0answers
120 views

What can POLYCOLOR mean and is there a way to convert to RGB?

It is not for the first time I found in the tables of some data column called POLYCOLOR. Is there any way to figure out what that means and is it somehow convertible to RGB values? If I get it right ...
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0answers
602 views

How to change color of points dynamically from a geoJson in openlayers

I am new in Openlayers and what I am trying to do is to dynamical give a color to some points read by a GeoJSON file. I am taking inspiration by this post How can I add an infowindow to an ...
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0answers
225 views

Postgis Raster Unions Color Issues

Can someone explain to me what I am doing wrong here as I think I do not properly understand postgis raster bands. I have a set of geometries that I want to merge with a raster and created a raster ...
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0answers
81 views

Vector Layer Symbol (ism) properties?

I would like to streamline the render of a polygon grid vector layer as a simple line (no fill) via Python coding. I am I bit confused by the implementation referenced by the API. Is it possible to ...
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0answers
95 views

Problem – QGIS 2.2 - Values under Color Rendering saved in style not applied when applying the loaded style?

I have saved two variants of the same color-scheme by putting in different values under “color rendering” in the lower part of the screen. It’s a singleband pseudocolor scheme. Now when I load each ...