How to change colors of img item that is bound to LUT item ?

[Luka Drmic]

central_item = pg.GraphicsLayout()
main_subplot = central_item.addPlot()
img = pg.ImageItem()
img.setImage(self.plt_data)
main_subplot.addItem(img)

histogram = pg.HistogramLUTItem()
histogram.setImageItem(img)
histogram.setFixedWidth(128)

How do i make the colors default to one of the options in the right click menu of the GradientEditorItem instead of the black-white option.

Or in other words, how do i programmatically change the colors of my image.

Desired result:

[Patrick]

Hi,

You can access the GradientEditorItem (http://www.pyqtgraph.org/documentation/graphicsItems/gradienteditoritem.html) component directly and set one of the default colormaps by:

histogram.gradient.loadPreset('thermal')

You can also make your own custom gradient with something like:

histogram.gradient.restoreState({"mode": "rgb",

            "ticks": [(0.00, (0, 0, 0)),

                      (0.05, (0, 0, 128)),

                      (0.50, (185, 0 , 0)),

                      (0.75, (255, 220, 0)),

                      (1.00, (255, 255, 255))]})

Patrick

[Luka Drmic]

Thank you kind sir.

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