This is a graphicsWidget which provides controls for adjusting the display of an image. Includes:
If image (ImageItem) is provided, then the control will be automatically linked to the image and changes to the control will be immediately reflected in the image’s appearance. By default, the histogram is rendered with a fill. For performance, set fillHistogram = False.
Enable auto-scaling on the histogram plot.
Set the Y range on the histogram plot. This disables auto-scaling.