Great, thank you Eric!
On Thursday, September 26, 2019 at 8:09:26 PM UTC-4, Erik J wrote:
>
> Hi Gene,
>
> Here is a simple function I use to convert mpl colormaps to pyqtgraph form:
>
> import numpy as np
> from matplotlib import cm
>
> def colormap(name):
> colormap = cm.get_cmap(name)
> colormap._init()
> # Convert matplotlib colormap from 0-1 to 0-255 for PyQtGraph
> lut = (colormap._lut * 255).view(np.ndarray)[:colormap.N]
> return lut
>
> You can easily use it to set your colormap in pyqtgraph as follows:
>
> img.setLookupTable(lut)
>
> where img is a PyQtGraph ImageItem. The truncation of the colormap
> ("[:colormap.N]") keeps only the portion with the colors. mpl has a few
> extra entries at the top of the colormap that don't work with pyqtgraph. I
> got the function originally from somewhere in these group postings but I
> can no longer find it. I added the truncation part. This works well for me
> as I display both mpl and pyqtgraph images in a single Qt window.
>
> Hope this helps,
> Erik
>
>
> On Wednesday, September 11, 2019 at 9:09:59 AM UTC-6, Gene Beidl wrote:
>>
>> I am creating a spectrogram to be displayed as an image and I want to use
>> the magma colormap from Matplotlib.
>>
>> It's shown here:
>> https://matplotlib.org/users/colormaps.html
>>
>> And some 'magma' mapped spectrograms are here:
>> https://librosa.github.io/librosa_gallery/auto_examples/plot_hprss.html
>>
>> Is there a way to use Matplotlib colormaps with an image in pyqtgraph?
>>
>> Thanks!
>>
>>
>>
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