White screen in HSL Secondary...

Have you tried to uncheck "color/gray"?

After uncheck :

Basic operation of the HSL tab.

First, start by using the left eyedropper, the one that doesn't have a + or - attached to it, that's the one for general starting selection process. Click the eyedropper, then click on the Program monitor where you want to select data.Ctrl/Cmd-click gets you a larger selection other than a one-pixel selection. I nearly always use the Ctrl-click process.

After you've selected an area, then set the mask to on. Prior to clicking to turn the mask on, your image should be unchanged and showing the whole image. After you turn the mask on, it will show only the pixels that meet the criteria of the combined slider controls for Hue, Saturation, and Lightness (Luma).

Some keys work best with only one or two of the criteria controls, and if you unclick the checkbox to the right of any selection slider you turn that criteria off. So if say you want all pixels of a hue regardless of saturation or brightness, unclick Sat and Luma.

Once you have your key set ... using the mask ... so it shows only color on the pixels you want to change, then turn the mask off.

Now you use the controls below those to make the change in the color to the area selected by the sliders above. The color wheel (which can be in either whole-image or 3-way shadows/mids/highlights), and the Temp, Tint, Contrast, Sharpen, and Sat controls.

Neil

If you have selected an area with the eyedropper, you should have all three sliders showing a setting. A slider without any range selected will of course show no area selected ... and so a totally gray area.

With that example, if you turned off the Sat and Luma sliders that do not have a range selected, the Hue range selected would have shown.

Neil

Did you first select an area with the eyedropper tool? As asked above?

Before the mask can help, you need to select an area to affect.

Neil

You have the Color/Gray mask turned on. This means that any area that is 'selected' by the sliders will show in color, while all the non-selected area will be gray. It's a mask I use a lot, personally.

The issue is there's nothing selected yet. So of course, everything is gray.

Use the eyedropper to select some area of the image prior to turning on the mask. Use the mask to make sure your selection includes everything you want, and very little you don't.

Also, you'll need to soften with a few points of blur normally, and to keep from having 'chatter', a few points of denoise help. Not a lot typically, just a little of both.

Neil