Hi,
I think you want to disable the (default) autoLevels when setting your
image data:
http://www.pyqtgraph.org/documentation/graphicsItems/imageitem.html#pyqtgraph.ImageItem.setImage
So just something like
my_imageItem.setImage(data, levels=(0, 100), lut=lut)
should do it, changing the levels to whatever limits of your integer data
are.
On Wednesday, 25 March 2020 22:49:04 UTC+10:30, Manu wrote:
>
> Hello,
>
> I am displaying an image of integers, a so-called label map. Each integer
> corresponds to a different class and should have its own color. It works
> fine when the image does not change. However in my application, the label
> map changes and new integer values are added. When this happens, the color
> assigned to already existing integer values change. I want them to stay the
> same.
>
> What happens in practice: in current label map, '1' corresponds to blue.
> When I add the new value '2' : '1' changes to red, and '2' adopts blue. I
> want '1' to keep its initial color blue, and '2' to adopt a new color.
>
> Any idea?
>
> If it helps, here is how I create the lookuptable (I use a method found in
> this group to convert from matplotlib):
>
> colormap = matplotlib.cm.get_cmap('CMRmap')
> colormap._init()
> lut = (colormap._lut * 255).view(np.ndarray)
> # edit alpha channel so that '0'->transparent
> alpha = np.ones(lut.shape[0]) * 255
> alpha[0] = 0
> lut[:,3] = alpha
>
> my_imageItem.setLookupTable(lut)
>
>
> Best,
> Manu
>
--
You received this message because you are subscribed to the Google Groups
"pyqtgraph" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/pyqtgraph/d7dcf184-e538-4baa-8d6f-b5ac293845a8%40googlegroups.com.
