Flip images when ranges are reversed

Hello,

I’m new to Bokeh, and it might be that I’m using the library wrong, but in most of the image libraries the [0,0] pixel refers to the top left pixel of the image, while in Bokeh (I have not been able to change it) the [0,0] coordinate refers to the bottom left pixel of the image. This simple script to load and plot an image:

import bokeh.plotting as plt
from skimage.io import imread
lenna = imread('/tmp/lenna.png', flatten=True)
p = plt.figure(x_range=[0,10], y_range=[0,10])
p.image(image=[lenna], x=0, y=0, dw=10, dh=10, palette='Greys9')
plt.show(p)

Results with the image plotted upside down, as seen in the attached images (image is also converted to grayscale but this is not relevant):

I’ve tried reversing the range to [10, 0] but this results in displacing the image, not fliping the y axis. The only way I’ve found to plotting it right is by flipping the numpy array lenna[::-1] before sending it to plot (but I guess it should be a better way).

Is there a way of doing it? Is it a bug? Or am I using the library wrong?

Thank you

[Imperssonator]

I’m going to +1 this because it’s still an issue in 12.10.

I would propose adding an option invert_y with a default of false, which would ensure backwards compatibility. origin implies translation, not inversion of any axes.

[markroxor]

Flip the image first using lenna = np.flipud(lenna)