HCL Sliders

HCL Sliders is a Python plugin made for Krita (free professional and open-source painting program).

This plugin contains sliders for various hue/colorfulness/lightness models for use in the sRGB color space and its linear counterpart.

Available Models

sRGB Color Space

HSV (Hue, Saturation, Value)

HSL (Hue, Saturation, Lightness)

HCY (Hue, Relative Chroma, Luma/Relative Luminance)

Oklab Color Space

OKHCL (Hue, Relative Chroma, Referenced Lightness)

OKHSV (Hue, Saturation, Value)

OKHSL (Hue, Interpolated Saturation, Referenced Lightness)

OKLCH (Lightness, Chroma, Hue)

Accepted CSS Syntax

Hexadecimal notations: Must be 3 or 6 digits in the order of RGB, i.e. #AABBCC #abc

Oklab notations: RGB values will be clipped to the sRGB gamut, i.e. oklab(50% 0 0)

Oklch notations: Hue can be given in deg, grad, rad or turn and RGB will be clipped, i.e. oklch(50% 0.1 270) oklch(50% 0.1 300grad)

Some extra non-standard formats are also supported when parsing:

• Hexadecimal without the # prefix, i.e. AABBCC
• Oklab/Oklch without the okxxx and brackets, i.e. 50% 0 0 (Or not using percentage value, like 0.5)
• Oklch accepts negative angles for Hue i.e -90 (equivalent to 270deg)

Slider Interactions

Left Mouse Button/Pen Press: Set value for channel

Ctrl + Left Mouse Button/Pen Press: Snap value to interval points

Shift + Left Mouse Button/Pen Drag: Shift value by 0.1 precision (or lower for chroma)

Alt + Left Mouse Button/Pen Drag: Shift value by 0.01 precision (or lower for chroma)

History Interactions

Left Mouse Button/Pen Click: Set color to foreground

Ctrl + Left Mouse Button/Pen Click: Set color to background

Shift + Left Mouse Button/Pen Drag: Scroll color history

Alt + Left Mouse Button/Pen Click: Delete selected color from history

Alt + Left Mouse Button/Pen Drag: Delete a series of colors from history, starting from the point where mouse/pen is pressed until where the mouse/pen is released

Background Selector Mode

Click on the color display panel on the plugin to toggle between selecting foreground and background color.

Install/Update

1. Download the ZIP file
2. Open Krita and go to Tools -> Scripts -> Import Python Plugin From File.
3. Navigate to the download location and select the ZIP file.
4. Restart Krita.
5. Go to the Python Plugin Manager again to check if Ten Brush Slots extension is activated.
6. If not activated, click on the checkbox beside it and restart Krita again.
7. Go to Settings -> Dockers -> HCL Sliders, click on the checkbox to activate it.