- Images-Gradients-Backgrounds
- Background Remover If you have an image with a white or colored background you want to remove, this site can help. But remember, you have to save the image as .png because JPEG images don’t support transparency.
- Gradient Image MakerOpen
- Color Wizard
- Colors Palette Generator Trying to match the colors to a favorite photo or illustration? This site will let you upload an image, and then it will tell you the hex codes of its main colors.
- Colors Gradient
- Gradient Backgrounds
- Gradient Maker
- CSS Float Theory
- Art, Design and Visual Thinking: An Interactive
- Color Theory for Designers, Part 1: The Meaning of Color
- Adobe Color is an excellent resource for extracting a color scheme from artwork. Look for the Extract Theme option in the menu, then upload a photo, a logo, or any artwork. An intuitive interface allows you to tweak the generated color scheme
Not Webpage-based colours but still of interest - https://www.ralcolor.com/
- RAL_colour_standard