Delta E (2000) between two images?

[blue-j]

I'm feeding two images into the color difference function, and then calculating stats:

`delta_E = colour.delta_E(image1_lab, image2_lab, method='CIE 2000')

print(np.min(delta_E),np.max(delta_E),np.mean(delta_E),np.std(delta_E))`

It seems to work fine. But is this a valid use of the function? It seems built to send two Lab value not two Lab images.

Thanks!
J

[KelSolaar]

Yes this is fine, the function is vectorised so you can certainly pass an image!

[blue-j]

Thanks so much! What a relief. Is there any way to get the raw delta E values that are being calculated?

[KelSolaar]

Not sure what you mean by the raw delta E values?

[blue-j]

I perhaps have made an incorrect assumption. I assumed you'd have to calculate a bunch of separate deltas? I'm asking for and receiving a mean, for example, so it's got to be a mean OF something, yes? Please forgive me if I'm being daft, I'm a lifelong student and grateful to those who share their knowledge. 🙏

[KelSolaar]

No worries!

Say you have two images a an b in CIE Lab with the following shape: (600, 800, 3). When you compute the Delta E between the two, the resulting array should be of the (600, 800) shape and it represent per-pixel Delta E.

Does it make sense?

[blue-j]

It does! Thank you so much for your help and for your sharing this incredible work.