( bringing it back to the list :-) ) And are you sure the image retrieved from the xyz server is not a jpeg (compared to your original png)? You can try to see the actual url's used via F12 (the Debugging Development Tools panel) in QGIS.
Another option: QGIS does not respect the xyz-zoomlevels always.. so it is very easy to go to a zoomlevel in which QGIS has to resize the original image a little (and 'resample' it, see Rendering/Raster settings in the Options). So to really compare QGIS image to the original one, you have to use the 'Zoom to native resolution' in the legend/layer context menu). Last idea: is your project in the same CRS as the xyz service (probably EPSG:3857?) Because if not, QGIS will also resample your original image to 'fit' the tile in the right position in that other crs.... (and again: I know nothing about Qt image rendering ....) Regards, Richard Duivenvoorde On 3/9/23 15:36, Stephane Goldstein wrote:
I can see the difference by comparing the .png file in an image editor (https://pasteboard.co/YodS7tuhtzSC.png <https://pasteboard.co/YodS7tuhtzSC.png>) and how it's rendered in QGIS (https://pasteboard.co/tcGLRc7XrsNj.png <https://pasteboard.co/tcGLRc7XrsNj.png>). The examples are at the same zoom level. On Thu, 9 Mar 2023 at 21:46, Richard Duivenvoorde <rdmaili...@duif.net <mailto:rdmaili...@duif.net>> wrote: On 3/9/23 14:05, Stephane Goldstein via QGIS-User wrote: > Hi. > Is there a way to disable anti-aliasing of the png tiles loaded on an XYZ layer ? Hi Stephane, From what do you conclude that there is anti-aliasing going on with XYZ layers? I use xyz layers also but I'm not aware of such behaviour? FYI: this is the code rendering the images: https://github.com/qgis/QGIS/blob/master/src/providers/wms/qgswmsprovider.cpp <https://github.com/qgis/QGIS/blob/master/src/providers/wms/qgswmsprovider.cpp> (tried to search for 'alias' but could not find anything) Note, I'm not an expert in this field, so just wondering... Regards, Richard Duivenvoorde
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