Filter gallery greyed out in photo shop while image mode on lab color at 8 bits/channel

[Shelby32008645cnmk]

Hi I am trying to use filter gallery to use glowing edges whilst on image mode lab color. It will work if on RGB 8 bits but not lab color 8 bits. The option is just filter gallery is just greyed out. Please help. 

[Bojan Živković]

Help yourself by switching to RGB color mode if you want to use Filter Gallery, its not bug on your side, nothing to do about it.

[Shelby32008645cnmk]

It did work when I first tried it following a video but when I realised I
hadn't duplicated the photo in the beginning I exited out and tried again
and it wont work .

[Shelby32008645cnmk]

I would like it in lab color as I would like to use the lightness function to help with noise.

[c.pfaffenbichler]

I would like it in lab color as I would like to use the lightness function to help with noise.

RGB it is.