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In ArcMap I have USGS BMP files for geological lithology patterns to fill a polygon. When I choose Picture fill symbol and add one of this BMP files then as a second fill layer I choose simple fill symbol from symbol selector together. It changes my BMP file's background color which color as I pick from simple fill symbol layer.

Select BMP file for the Picture fill symbol:

select bmp file for the Picture fill symbol

symbol selector combines both Picture fill symbol layer and simple fill layer

Symbol selector combines both Picture fill symbol layer and simple fill layer with simple fill color as raster background.

But in QGIS (3.2.0 Bonn) I cannot do this use raster image fill and simple fill together to change raster background color. I also try this with PNG file types as a raster image fill. However I couldn't succeed it with SVG files, because whenever I convert image to SVG, symbol selector displays just blank as a SVG fill.

Anybody can help me?

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The tests I'm trying out the background of the pattern fill needs to be transparent and saved as a PNG. This is typically done using GIMP, Paint.net or other image software you may be using. Once I've done that, I'm getting the effect I believe you are looking for.

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