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

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1answer
171 views

Forcing color ramps to center around zero in QGIS

I have several columns of data that have percentage values. Some are positive and some are negative. In one particular column, the values range from -0.70 to +0.20. The mean value of the column is ...
4
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0answers
101 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
113 views

Extracting GeoTIFF colours and adding to equal geometry shapefile

I have the following map in .png-format that I would like to replicate, but I cannot obtain the original data. The map shows the current water supply vulnerability for local municipalities in South ...
3
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0answers
291 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
192 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....
3
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0answers
187 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
253 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
254 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
29 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
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0answers
249 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
33 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
74 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
494 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
113 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
859 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
178 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, ...
2
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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
387 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 -...
2
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0answers
111 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
160 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
965 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
368 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
200 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 ...
1
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0answers
35 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 ...
1
vote
1answer
21 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 ...
1
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0answers
29 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 ...
1
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0answers
54 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
279 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
128 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
43 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 ...
1
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0answers
35 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
66 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 ...
1
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0answers
298 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
59 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. ...
1
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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
96 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 ...
1
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0answers
101 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 ...
1
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0answers
525 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
197 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 ...
1
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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 ...
1
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0answers
94 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 ...
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0answers
160 views

Color blending/compositing in web mapping frameworks?

The color/layer blending capabilities of QGIS 2 produce marvelous results. Blended rasters are especially nice to look at. Blending is, to me at least, a better way of combining layers than mucking ...
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0answers
15 views

Getting currentfeature's color in Expression Builder of QGIS 3.xx

I want to obtain the color code of the current feature like this : Getting currentfeature's color in Expression Builder of QGIS? But I am in QGIS 3.14 and I dont understand how to convert the ...
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0answers
26 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 ...
0
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0answers
20 views

TIFF image merge colour distortion

I am trying to merge 4 TIFF files and the resulting merge is coming out with some odd colour distortions. Does anyone know how to resolve this?
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0answers
18 views

R nightlights color palette blue to yellow

I would like to plot nighttime light images in R using traditional NASA used color palette from blue to yellow. Does this color palette exists in any package?
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0answers
30 views

Customize colors, symbols and point sizes by different attributes using ArcMap

I am using and extremely new to ArcMap. I have some data with have two major attributes: geological group name, and estimated vegetation coverage classification names. The vegetation classes are ...
0
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0answers
14 views

Style layers by attribute in AGOL? (Symbolgy by attribute/ color by attribute)

How do I in AGOL set the colors by attribute? aka let the attribute value determine the color of features within a feature layer. I have an attribute which contains the color values I need for about ...
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0answers
20 views

Convert 1-band .nc file to GeoTiff with RGB

How can I convert 1-band .nc file to GeoTiff with RGB? I have tried using gdal translate but it won't let me apply color interp of RGB to the .nc as it has 1 band.