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Better text contrast of pixel brightness values in Qt window

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This offsets text brightness of pixel brightness values
by offsetting it by 127 to the curent pixel value.
The text is now readable even if pixels are black.
This commit is contained in:
Jan Gaura
2018-03-14 13:27:11 +01:00
parent 7e9578789b
commit eb3969e244
1 changed files with 5 additions and 0 deletions
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modules/highgui/src/window_QT.cpp
+5
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@@ -3094,6 +3094,11 @@ void DefaultViewPort::drawImgRegion(QPainter *painter)
if (nbChannelOriginImage==CV_8UC1)
{
QString val = tr("%1").arg(qRed(rgbValue));
int pixel_brightness_value = qRed(rgbValue);
int text_brightness_value = 0;
text_brightness_value = pixel_brightness_value > 127 ? pixel_brightness_value - 127 : 127 + pixel_brightness_value;
painter->setPen(QPen(QColor(text_brightness_value, text_brightness_value, text_brightness_value)));
painter->drawText(QRect(pos_in_view.x(),pos_in_view.y(),pixel_width,pixel_height),
Qt::AlignCenter, val);
}