[ts-7000] ts-7390 Qt gradient background help needed

["jasonpenn_1981" <>]

When I tell QT I want it to display a gradient from white to half way to black 
from the top to the bottom of the display I get a rather banded looking 
background. In the style sheet I ask for this:

QDialog {
background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,stop: 0 #ffffff, 
stop: 1 #777777);
}

Given this hardware's rgb565 hardware, I think this behavior makes sense when 
it displays about 16 distinct bands of gray. Unfortunately a banded gradient 
doesn't look as nice as a smoother one. Googling leads me to believe that one 
way to get a smooth gradient is by loading an image file as the background 
where the image is dithered to smooth out the transitions between shades of 
gray. Thus far I haven't gotten what I want using a dithered background image 
in the style sheet like this:

QDialog {
background-image: url(:/images/back_gradient.png);
}

I attempted to make a suitable .png by using ffmpeg to convert from a 24 bit 
gradient to rgb565 then converting the apparently dithered rgb565 image back to 
.png so Qt can load it. I got a banded gradient or no gradient at all from my 
attempts.

Another technique I found referred to creating the dithered gradient image at 
run time. I don't know how to accomplish that.

My hope is one of you knows how to get a smooth gradient background and can 
help me.

Thanks.

-- 
Jason
 



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