Annewin wrote:
I can no longer choose Lab color under mode because many option are greyed out.
Anne when a feature is not compatible with the active document Photoshop will gray out the features in its menus. For example if you are editing an HDR image in 32 Bit color mode. Many Photoshop features do not support 32 Bit Color so they will be grayed out. Lab for sure will be grayed out as will many other menu items.
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