Color space of internal processing of Lightroom - CIELAB (1976)?

Dear reader,

just for your interest:

I created an image with a lot of spots of color and desaturated it in Lightroom.

Especially on the Blues there is a change of important to the purple hue, as usually with the color CIELAB(1976!), due to a fault, 'van Kries' space transform in CIELAB (source: Mark D. Fairchild, color appearance models). Other colors are hue shifted when desaturated, too, but the blue are the worst cases.

Color space of internal processing seems to be CIELAB.

There are several perceptual uniform color as CIECAM02 spaces, but this one is calculate maybe too intensive. other alternatives might be RLAB or ZLAB.

I wonder why in the profile of the monitors, cameras, etc., then Lightroom use CIELAB?

Kind regards

i4711

Lightroom uses RGB "Melissa", which is a Variant of Gamma ProPhoto RGB. It's quite well documented. http://ptgmedia.pearsoncmg.com/imprint_downloads/Peachpit/Peachpit/lightroom4/pdf_files/Li ghtroomRGB_Space.pdf

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