How to change the colour on the image?
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It is. But there are so many ways to do this depending on what your needs actually are...
One could be simply this: place a qml Rectangle over your image, make it partially transparent and adjust the colour as you wish (take a look at Qt.tint() method, might come in handy). Or use several different source images and swap them when the theme is changed. Or write your own painting code for a new qml component. Or use GL shaders.
