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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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3answers
170 views

Changing colour of imported SVG icon in QGIS 3.4

I have imported my customised icon (which was obtained through the .jpeg image conversion) for point layers using an SVG file. This works well except for the fact that the original colour was ...
1
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0answers
36 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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2answers
46 views

Can QGIS do color transformation from RGB to IHS (Intensity,Hue,Saturation)?

I need to transform RGB map to IHS is that feature available in QGIS?
3
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1answer
26 views

Filling or splitting polygons proportionally based on variables using QGIS?

I want to divide each country into three separately coloured areas, like this: The proportions of the three coloured areas must based on three columns of attribute data in the country shapefile's ...
2
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2answers
69 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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2answers
39 views

Custom color palettes not visible to other layers?

Full-disclosure: fairly new to QGIS (v3.4), and I am currently styling a map for presentation. I'm trying to match colors within data contained on a layer using "Categorized" styling, so that I can ...
2
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2answers
33 views

Heatmap-no data vs Zero

I am new to QGIS. I am working on creating heat map of bird diversity(data downloaded from ebird.org). The issue I face is that how to differentiate between: There areas where data is not available (...
2
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0answers
18 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 ...
0
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1answer
28 views

Changing color scale in KML files?

I want to work with kml/kmz files in the Google Maps API, but I want to remap the color scales. Is that possible? Here are example kml/kmz files where I'd like to change the color representation ...
5
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1answer
44 views

QGIS rendering TIFF color with wrong color

When I try to display a GeoTIFF image with single band pseudocolor, the style seems to be wrong for values out of the range 255. The legend is shown as The green pixels have a value larger than 255....
2
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1answer
49 views

Coloration of orthophoto different between QGIS and ArcGIS

I have an orthophoto created with Agisoft Photoscan that I would like to use for a map. Why is there a difference in coloration between QGIS and ArcGIS? For the record, the color showing in QGIS is ...
2
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1answer
249 views

Change Layers Panel background color in QGIS

In QGIS it's easy to change background color of the map canvas, but is there a way to do the same for the Layers Panel ? In cases of very light colored styles these appear not so clear (if at all) on ...
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1answer
43 views

Why does gdalinfo -hist give values outside of [0 - 65535]?

I am running gdalinfo -hist on a 3 band tif file and am getting the following output (see below). Notice it says 256 buckets from -78 to 40184. That's fine, but then when it shows the histogram, ...
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2answers
135 views

How to assign raster layer's colors to polygons in QGIS?

I have a georeferenced raster file showing parcels of a town with different colors (yellow for the category single-household residential, green for agricultural areas, etc.). I also have the shapes of ...
2
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2answers
84 views

Same colour palettes for two different maps in ggplot2

I am constructing two ion concentration maps in the UK using ggplot2. The dataset used for mapping are lzn.kriged1 and lzn.kriged2 which basically has the same structure: > str(lzn.kriged1) Formal ...
1
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1answer
42 views

Highlighting using distinct color where features overlap in QGIS?

I have two species on my map and right now they are different colors. However, what I want to happen is when they overlap in the same spot, the color is a distinct difference from the other two colors....
1
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1answer
94 views

How to display a bright and realistic GeoTIFF using GDAL?

I am using GDAL (gdal_merge) to put together some landsat photos using the proper bands. When I open the GeoTIFF that is created using gdal_merge (in Windows), the GeoTIFF is super dark. Now, when I ...
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0answers
43 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 ...
0
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0answers
20 views

Set Color Ramp of Raster using Arcpy

I have a script which creates multiple Raster layers (sometimes more than 100). By default, these are created with the gray-scale color ramp, which for the purposes of my users is almost worthless. A ...
1
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1answer
85 views

Color Correction from two nearby Landsat8 Rasters in QGIS?

I have two Landsat8 images and they are side by side, but they are from different Dates. They look similar, but the color of the same forest is a bit different. I tried a color correction in QGIS ...
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0answers
25 views

Grass Transparent Heatmap

I made a heatmap raster layer in GRASS 7.0.3 and am trying to change the color table so that the lower end is transparent and the higher end is red. Right now if I put the heatmap raster as the top ...
0
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1answer
39 views

Pansharpened Raster Color Changes After Clipping

I have a mosaic raster of an agricultural area. In the mosaic raster, a specific agricultural field (field no. 5) looks just like this When I clip the raster with the field's shapefile (shapefile of ...
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0answers
37 views

Same color point and line [duplicate]

I want to have same color for point and line, example: The road(line) and the street name signs(point) that has any same atribute, for example, name or unique code, to have and same color on ...
3
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0answers
135 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 ...
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0answers
240 views

Toggle polyline show/hide

I have created a map, and added a polyline with a moving icon, how can I toggle between hide/show the line on mouse click. My code: function initMap() { var map = new google.maps.Map(document....
1
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2answers
291 views

Displaying different attributes within layer with individual colors in QGIS 3? [duplicate]

I am trying to display different soil types within a geological soil layer with individual colors per each type of soil. As of now it is displaying all as the same color.
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2answers
175 views

Merging LiDAR tiles without losing data in QGIS?

I'm trying to merge some LiDAR tiles together but when I do, the clarity of the image drops, so I think that means I am losing some data. How do I merge the tiles and keep all of the data and the ...
0
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0answers
131 views

Convert GeoTIFF to DWG

I like to convert a georeferenced tif-file into a dwg-drawing. At first I convert the raster into a polygon. The result is Grey-coloured picture When I "Export to CAD" the polygon it is still Grey. ...
0
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0answers
42 views

Batch colour rasters in MapInfo 16

I have say 50 raster files in .ascii I know I can colour them using the raster -> advanced colour tab. I have saved the colour legend in a .color file. Is there a way I can apply this .color file to ...
4
votes
1answer
77 views

Creating QGIS map that can be exported and used for 2-colour (spot) printing?

I can produce black and white maps from raster images, with areas blocked out with a single 'Pantone' colour. Provided I use the 'multiply' blending mode, I can overlay the black and white map layer ...
4
votes
1answer
164 views

Adjusting color of raster in QGIS?

Is there a plugin or function in QGIS that allows for RGB raster color adjustments to enhance visibility of specific features captured on a map? Example: I'd like to enhance contrast and saturation ...
0
votes
0answers
44 views

In QGIS print composer, pdf in CMY/RGB, dosen't show correct colore after print [duplicate]

By color setting in QGIS, I can only set RGB color but not CMY, so I've taken the cmy color from FreeHand, converted to RGB in Adobe Photoshop. Then exported the map as PDF (in QGIS). Before printing ...
2
votes
1answer
133 views

Colour Scale Bar for One-Band Rasters Error

I have a vector layer of a map with a number of regions. I have coloured those regions using a gradient blue colour. I would like to create a colour scale bar for this map. I downloaded the Colour ...
3
votes
1answer
67 views

Using gdaldem to match cumulative count colouring of QGIS?

I am trying to colour a single band grey raster (NDVI) using gdal to match the same colouring when I bring the raster into QGIS and colour it with a cumulative count cut (2%/98%). When I use the code: ...
2
votes
1answer
327 views

How to change raster palette?

I have a tiff raster with values from 0 to 255 (one band) and 7 colors. I would like to change colors of my tiff. I tried with QGIS but I can't save it with new colors. from this to that ...
4
votes
1answer
253 views

How to colour text background by category?

How can I change the colour of text labels by category? EG, I have a text layer with text that is categorised into 6 different categories. I need either the text itself, or its background to match ...
0
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1answer
53 views

CartoCSS & change colours on road-colors.yaml

I am looking at just having one shading of colours for OSM roads like red. When I update the hue values to something like 10-45. I try the generate the generate_road_colours.mss file. But this ...
1
vote
1answer
86 views

Color matching for satellite images

I have two Landsat 8 satellite images from two different dates in may. When I import them in ArcGIS they slightly overlap but the pixel colours don't match making it hard to run an NDVI. I have been ...
0
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0answers
88 views

QGIS rasterize image using only one colour band (red)

I have some image files (with .jpg extensions) like that in the attached figure: . I'm able to georeference this image in QGIS. Then I would like (trials were unsuccessful till now) to obtain a ...
2
votes
1answer
115 views

Save to PNG changes colors

I am trying to save this print composer as PNG When I open the saved file, this is the result The same thing happens if I save to pdf. Any idea what's going on?
4
votes
2answers
92 views

QGIS second-order district coloring

Is it possible to make a single layer style similar to what the map below has? I.e. first-order districts have different hues, but their constituent second-order districts have different shades. I'...
2
votes
1answer
65 views

Why do colours merged onto a shapefile in base R display incorrectly?

I have a shapefile: https://www.dropbox.com/sh/x1p9ctssdp6xz4r/AADZzy10j8VPigtWkcNxAZata?dl=0 which I read in like this: Somalia = readOGR(dsn = "Somalia", layer = "Somalia") I ...
3
votes
1answer
1k views

Change Color in GeoPandas Plot

My question has overlap with Changing colours in GeoPandas?, but unfortunately still unanswered: I want to plot a multiline shapefile in 1 color. import geopandas as gpd multiline_example = gpd....
2
votes
2answers
503 views

Creating visually standardized RGB images from Sentinel-2 data

I want to create "visually appealing" RGB images from Sentinel-2 L1C data in a standardized manner. Obviously, this starts with extracting the bands 4, 3, and 2, which correspond to the Red, Green, ...
1
vote
0answers
29 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 ...
2
votes
2answers
284 views

Nested polygons in QGIS overlap and don't show the real colour gradient

I am working with nested polygons in QGIS and each of them has got a specific let's say n (numeric) value represented with a given colour gradient. All my polygons are loaded into one shapefile If I ...
5
votes
1answer
546 views

Displaying polygons with colour gradients that changes at value 0 using QGIS?

I am plotting some model outputs in QGIS and let's say I have got a given number of polygons and for each one a value which can be negative OR positive. I need to assign to each polygon's value a ...
3
votes
2answers
182 views

Exporting map as tif in CMYK colour space [duplicate]

I am getting my maps from QGIS ready for publication in a journal. The journal requires colour images to be tif format in the CMYK colour space. I understand how to save images as tif, but I cannot ...
2
votes
0answers
334 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, ...
0
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0answers
32 views

Indexed color images for print media

Is an image saved in indexed color suitable for a printed book? My project requires tiff images at 300 dpi for a pdf book suitable for printing. Each image must be less than 2.5 MB. Several are map ...