<![CDATA[[SOLVED] How would you set an alpha "texture" for QBrush?]]>I'm developing a custom color picker for an OpenGL application and I'm using QGraphicsView to preview the changes of color the user inputs. Since I have 4 sliders (one per channel) that alter the resulting color, I realized that if I moved the alpha one to zero, the preview will turn white. I would like it to turn something else, like that common squared texture from image editors like Gimp.

Is there any way to achieve this with QBrush?

]]>https://forum.qt.io/topic/51554/solved-how-would-you-set-an-alpha-texture-for-qbrushRSS for NodeThu, 16 Apr 2026 08:33:23 GMTMon, 23 Feb 2015 22:36:13 GMT60<![CDATA[Reply to [SOLVED] How would you set an alpha "texture" for QBrush? on Mon, 23 Feb 2015 23:47:40 GMT]]>You're right.

I forgot I was using a QBrush for the background, so I could use one for the foreground too. By setting a texture for the background one and tweaking the foreground colors I achieved what I was looking for.

Thanks SGaist!

]]>https://forum.qt.io/post/262734https://forum.qt.io/post/262734Mon, 23 Feb 2015 23:47:40 GMT<![CDATA[Reply to [SOLVED] How would you set an alpha "texture" for QBrush? on Mon, 23 Feb 2015 23:25:50 GMT]]>Then what about QBrush::setTexture ?

]]>https://forum.qt.io/post/262728https://forum.qt.io/post/262728Mon, 23 Feb 2015 23:25:50 GMT<![CDATA[Reply to [SOLVED] How would you set an alpha "texture" for QBrush? on Mon, 23 Feb 2015 23:03:06 GMT]]>Hi SGaist,

No, what I would like to achieve is to show a texture on the background as the alpha channel reduces.

Just as the background of this picture:
http://www.cgmotionbox.com/wp-content/uploads/2011/11/Rendering-A-File-With-An-Alpha-Channel-In-After-Effects.gif

]]>https://forum.qt.io/post/262719https://forum.qt.io/post/262719Mon, 23 Feb 2015 23:03:06 GMT<![CDATA[Reply to [SOLVED] How would you set an alpha "texture" for QBrush? on Mon, 23 Feb 2015 22:57:11 GMT]]>Hi,

Are you thinking for something like :
@QBrush(QColor(0, 0, 255, 128))@
?

It should give you a half-transparent blue brush.

]]>https://forum.qt.io/post/262718https://forum.qt.io/post/262718Mon, 23 Feb 2015 22:57:11 GMT