Does it exist a method to compute the RGB to XYZ conversion matrix?

[stereomatchingkiss]

Question

Do this library exist dictionary or method to compute the conversion matrix between rgb and xyz colorspace list on this page? Example, 3.12.26 of readme.md hardcode matrix_XYZ_to_RGB value manually, do we have an api to get this matrix? Thanks

[KelSolaar]

Hi @stereomatchingkiss,

Yes it can be done with the colour.normalised_primary_matrix definition.

Cheers,

Thomas

[stereomatchingkiss]

Thanks, how could I found the primaries xy chromaticity coordinates?

[blue-j]

Thomas, thank you profoundly for sharing this incredible work. Deep bow!

I was wondering, reading this discussion, I have the impression the library doesn't have a conversion command?

Something like (pseudo code):

Lab = (15,117,-2)
XYZ = convert(Lab,XYZ)

?

Or in this case something like

XYZ = convert(RGB,XYZ) -D50 -Bradford

Just want to be sure I haven't missed something.

[KelSolaar]

Thanks, how could I found the primaries xy chromaticity coordinates?

The primaries for the various RGB colourspaces we defined are available here: https://github.com/colour-science/colour/tree/develop/colour/models/rgb/datasets

Thomas, thank you profoundly for sharing this incredible work. Deep bow!

I was wondering, reading this discussion, I have the impression the library doesn't have a conversion command?

Something like (pseudo code):

Lab = (15,117,-2) XYZ = convert(Lab,XYZ)

?

Or in this case something like

XYZ = convert(RGB,XYZ) -D50 -Bradford

Just want to be sure I haven't missed something.

We have the colour.convert definition here that does what you are describing: https://colour.readthedocs.io/en/develop/generated/colour.convert.html#colour.convert