RootXP - Colour Tools
Colour picker
Opacity
RGBA
HSV
HSL
Export PNG
Drag in the color area, move sliders, or edit HEX, RGBA, HSV, and HSL. Set transparency with the opacity field, the A channel (0–255), or HEX as #RRGGBBAA. Export a PNG of the selected colour and opacity; size defaults to 64×64 pixels.
Pick from image
Drop an image here, or choose a file. Drag across the image to sample colour and transparency.
Upload a PNG, JPEG, or other image. Drag the picker over the image to update HEX, RGB, HSV, HSL, and opacity from the pixel under the cursor.