Hue Identification

[cliff]

In other programs I've used, hue has been identified as between 0 and 360 degrees. As far as I can see PWP doesn't measure hue in this way. Is there any way I can remap skin tones in a portrait to a hue of about 25 degrees and a saturation between 25 and 40%?

Thanks very much,
Cliff

[tomczak]

PWP uses percent convention for all channels in either HSV or HSL colour models; the hue of 25 degrees should translate to H=25/360*100=~7% (providing your programme defines hue change the same way: starting from red=0 and going clockwise around the colour wheel back to red). In both HSV and HSL models hue has the same meaning, but to find the equivalent saturation and brightness value equivalent to what you're looking for, you will need to experiment with combinations of S,V or S,L - the S values of 25-40% sound like a good starting point to render skin in both models . You can set these values in Color Picker by probing or by hand.

I believe that the same skin colour will have somewhat different absolute HSV/HSL values (and consequently RGB values) depending on the working colour space (e.g. sRGB or AdobeRGB).

If you want to remap the skin colour, one way of doing it is by masking everything other than skin you want to remap, then using Colour Balance transformation to remove the present skin colour than add the skin colour that you want (both remove and add will pop the Colour Picker when you can remove/add any colour either by probing or adding the HSV/HSL values manually.

You can also try the new Remap transformation which allows for v. precise colour remapping without explicit masking (the Colour Picker is part of this transformation as well, and works the same way as in all other transformations that use it).

[tomczak]

I forgot to mention that if you just want to identify the HSV/HSL channels values, you can probe the skin area with the Readout tool.

[cliff]

Hi Maciej,

Thanks for the explanation. Now I understand the PWP hue measurement. I'll be working on improving skin tones.

I'm glad to see your web site is back online.

Cliff