HSL Sliders with Hex Code

Using a hexadecimal to HSL/HSB color value calculator won't be a reliable way to do it, because of the color space issue that richardplondon brought up. A specific color value looks different in the traditional web color space of sRGB than it does in the much larger internal color space of the Develop module in Lightroom Classic. Such a calculator might work if it also lets you specify the color space.

But if you have Lightroom Classic then you also have Photoshop, and you can use its color picker to convert between hex and decimal RGB witht a document set to a specific color space. You can see the problem in the picture below: Both the left (sRGB) and right (ProPhoto RGB) documents show a solid color with exactly the same color values, but the green looks more saturated in ProPhoto RGB (as in Lightroom) because that color space is larger.

The bottom line is that Lightroom Classic is designed for editing photographs using a full color range, not restricted to traditional web colors. If you want to edit images while limiting them to a web-friendly sRGB color space while being able to specify hex color values, it's best to edit them in Photoshop with the document color space set to sRGB.

Achieving a specific colour of green, say, is a matter of watching the colour value for a chosen point within the picture. Any colour value has meaning only in reference to a stated model, e.g. sRGB. Hovering the mouse pointer over the picture, the numerical readout just below the Histogram normally refers to the Lightroom internal colour model ("Melissa") in a 0-100 scale for red, blue and green. Unlike Photoshop, there is no ability AFAIK to see Hue values separate from Saturation or Lightness; only RGB. Those LR-internal RGB numbers will be very hard to relate to any desired target colour.

However, by enabling Softproof mode (most likely, sRGB will be the appropriate colourspace) the numerical readout switches to 0-255 for each of red, green and blue whereby these numbers DO represent particular colours as described by the sRGB colour model. So translating Hex colour coordinates into Decimal, which is a simple conversion, one can directly work to a target value. 

One detail to be aware of: once you start making adjustments while in Softproof mode, LR automatically creates - if needed - a brand new (virtual) "proofing copy", to which those proofing adjustments can be applied. They can then be copied / synced back to the master version, or otherwise this new virtual copy can be switched so that it becomes the master version of that photo.

Akash has you pointed in the right direciton for the enhancement request.

To get you going in the meantime, the Windows calculator app does hex to decimal conversions. I am assuming that the Mac calculator has the same feature.

Hi there,

Thanks for providing such a great feedback. Currently I don't think that there is a way to align HSL sliders with the color HEX codes.

I'd request to add this as a feature request on our Lightroom CC feedback community here: Lightroom Classic CC | Photoshop Family Customer Community ​

Our Engineering team monitor this space to prioritize the features bucket for future updates and the one you've suggested could be a great feature for better color management across different websites.

Regards,

Akash