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When displaying raster files in Qgis with the color-ramp stretched to the min/max values of the current display extent, the min/max values don't update automatically when zooming or panning to a new area.

The only way i know around it is to manually recalculate the values each time, which can be quite a pain.

I know this functionality to be a basic feature in ArcMap, so maybe I'm just missing something in the display options. So if anyone knows how to get the min/max extent to auto-update, please let me know how to do it. Thanks!

BTW: I'm currently using Qgis 2.4.0, but I encountered the same issue in all earlier versions I worked with.

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Yes what you say is correct, but a plugin called "Raster" can help you a little bit. But this works only on grey scale.Raster plugin

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