pyqtgraph直方图LUT项-如何更改颜色？

Question

I want to change the color of the blue bar in the histogram.

I've already changed the color of the background:

.ui.histogram.setBackground(background= pg.mkColor(37,37,37))

But I don´t know how to change the color of the Blue Bar . (I imported pyqtgraph as pg)

Does anybody know how to do this?

Thank you in advance

Answer 1

It's hard for me to make a answer that I'm certain of, because I don't have all information. For instance what is ui in your question? Next time please make an MVCE .

Anyway, assuming you have a ImageView object called imgView the following should work:

alpha = 50
region = imgView.histogram.item.region
region.setBrush(color=(255, 0, 0, alpha))
for line in region.lines:
    line.setPen(color=(255, 0, 0, 255))

Make sure that alpha is smaller than 128. The value of 2 * alpha will be used when you hover above the region, and you will get a warning if it exceeds 256.

By the way, the imgView.histogram.item is a HistogramLutItem . I got my answer by looking at its source code .