Questions tagged [dpi]

Dots per inch (DPI, or dpi)[1] is a measure of spatial printing or video dot density,

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What it means when choosing a “dpi” when exporting a PDF map in ArcGIS?

I'm trying to understand something when exporting map as PDF file in Esri's ArcGIS for Desktop. The ability to choose paper size. The ability to choose DPI. Thought that those are printer parameters....
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QGIS print layout (large size printed image)

I have been asked to create large size images to be the printed with a good quality to look at. The images could be with dimensions of 1 meter in height or width, but even larger. I must create these ...
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How to change layout DPI in QGIS 3?

I am trying to change the DPI of QGIS3 (3.6) in the layout manager. However, as the Figure below shows (lower left corner), the DPI (300 by default) seems to be read only. I tried to click the ...
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Changing default DPI for Export Map to Image in QGIS?

In QGIS 3, is there a way, perhaps a configuration file, to change the default DPI for doing Export Map to Image from the Project \Import/Export menu? I use this function a lot, but the default DPI, ...
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Could not allocate required memory for image

I'm trying to export a 24k image (export set to 1650DPI) using the "export as image" function but I keep getting the "Could not allocate required memory for image" warning. I don't understand why ...
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MapProxy WMS Print Scale Problem

The application that I work with consumes WMS services created in Geoserver via MapProxy. I used ysld to style my layers. As long as I want just display my layers in the application, the scales that I ...
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How to get DPI to find current scale in OpenLayers?

Is there a way to automatically retrieve the DPI value of an OpenLayers page? The goal is to automatically retrieve the map scale from this code: function mapScale (dpi) { var unit = map....
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How zoom base on scale in ol?

I want to zoom to ol3 map base on scale(for example 1:50000). This means every 1cm in ol map must show 50000cm in real world. for converting scale to resolution I used as follows: var ...
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How to calculate the ratio between DPI and MB in QGIS?

I need to make maps that do not exceed a limit of 20 MB. Up until now I worked with DPI values, that I choose when I export maps from the print composer Maps with the same DPI have a different MB ...