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I have quite a big area with DTM as a GeoTIFF. I want to save it to PNG with world file, but how to do it just in QGIS?

  • I know I can export view to PNG with world file, but it looses quality (Project/Export) .
  • I know how to transform format from TIFF to PNG but there I can't find any option for world file creation...
  • While i try to specify "PGW + yes" as extra option it says it is not supported...

What did I miss?

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    Can you use gdal_translate from the command line? (QGIS comes with gdal under the hood). I’m pretty sure there are options you can specify for world file creation etc.
    – Houska
    May 28, 2021 at 12:03
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    Probably you have a reason to use PNG but big png is very inefficient GIS format because the file must be de-compressed completely when software does anything with it.
    – user30184
    May 28, 2021 at 13:57

2 Answers 2

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Clearly do not know exactly how to proceed in QGIS but with GDAL command line utility gdal_translate, just need to do

gdal_translate -of PNG -scale -co "WORLDFILE=YES" input.tif output.png

It will write an output.png with an associated output.wld (contains world file content)

Edit: after answering, seen similar answer for jpeg e.g How to convert QGIS generated tiff images into jpg/jpeg using GDAL command line utilities?

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  • Thanks! it helped!
    – Lynx
    May 31, 2021 at 11:22
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Using the GUI, you can access the Translate tool:

Raster -> Conversion -> Translate

In this tool you can select the input layer, set the projection (optional), add other parameters (optional). Then select where you want to save the exported PNG image.

To export with a word file, add -co WORLDFILE=YES in the "Additional command-line parameters". You can check the final GDAL/OGR console call before running the tool.

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