1 / 27

Color Theory

Color Theory. Which colours is white light made of?. Color Mixing. Color can be perceived either from 1) a luminous object (TV, monitor, projector) using the Additive Approach 2) reflected pigment or ink (printouts, materials) using the Subtractive Approach. Additive Color Model.

yvonne
Download Presentation

Color Theory

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Color Theory

  2. Which colours is white light made of?

  3. Color Mixing Color can be perceived either from 1) a luminous object (TV, monitor, projector) using the Additive Approach 2) reflected pigment or ink (printouts, materials) using the Subtractive Approach

  4. Additive Color Model • Used by luminous objects ex. Computers, TV, projectors • When light energy is added, a color appears brighter • The additive primary colours are (RGB): – Red – Green – Blue • Secondary colours produced are (CMY) – Cyan – Magenta – Yellow

  5. Different percentages of red, green, & blue light are used to generate different colours • White light is created when Red, Blue and Green are mixed together • There is no way of making black by adding red, green and blue light sources, the screen must be black to start with.

  6. http://dev.physicslab.org/asp/applets/additivecolors/default.asphttp://dev.physicslab.org/asp/applets/additivecolors/default.asp

  7. Our Eyes

  8. Our eyes use the additive colourapproach, but how do we see colour if all wavelengths are coming in from the sun (white light)?

  9. Objects absorb all colors except the color being seen, which is reflected Green Light reflected White Light reflected White light White light Green Surface White Surface Blue Light reflected White light Red Light reflected White light Blue Surface White light No Light reflected Red Surface Black Surface

  10. Objects absorb all colors except the color being seen, which is reflected • White surface = all wavelengths (blue, red, green) are being reflected • Black surface = all wavelengths are being absorbed. • Red surface = blue and green wavelengths are absorbed, red is reflected • Green surface = blue and red wavelengths are absorbed, green is reflected.

  11. DEMO

  12. Questions, why are clouds white? • Why is it not a good idea to wear black in the summer?

  13. Subtractive Color Model • Used in the print media ex. inks, fabrics, paints, crayons, etc. • When more color is added, a color appears darker • The subtractive primary colours are (CMY): – Cyan – Magenta – Yellow

  14. What do you notice about the primary & secondary colours? • Secondary colours produced by CMY colours are – Red – Green – Blue • Different percentages of cyan, magenta & yellow light are used to generate different colours • There is no way of making white by adding CMY colour sources, the paper/canvas must be white to start with.

  15. Computers DON’T use the subtractive theory. Because printers work on subtractive colour system and computers don’t, it’s hard to reproduce the same picture.

  16. Cookie Wheel

  17. Colour Blindness • 1 out of 10 men and 1 out of 200 women have some type of color deficiency. • The most common type is mistaking red and green. • The second most common type is mistaking blue and yellow

  18. Blind Spot – not just on cars!

More Related