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AIM: what is a color model?

Ms. Edelman Sunday, October 5, 2014. Welcome eager young artists!. AIM: what is a color model?. DO NOW: take out your notebook and a pen. What is COLOR ?.

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AIM: what is a color model?

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  1. Ms. Edelman Sunday, October 5, 2014 Welcome eager young artists! AIM: what is a color model? • DO NOW: take out your notebook and a pen.

  2. What is COLOR? • Visual perception of the spectrum of light described in terms of hue, saturation and brightness. • This arrangement of attributes is called the MODEL.

  3. What is HUE? • The name given to a specific part of the spectrum – such as “red”, “blue”, “green”.

  4. What is SATURATION? • Refers to the purity of color • How much grey is or isn’t in it • The brightness or dullness of a color.

  5. What is VALUE? • Refers to the lightness or darkness of a color. • How much white or black is in the color.

  6. What is RGB and CMYK? • These are BOTH color models that are used by Photoshop.

  7. What is RGB and CMYK? • These are BOTH color models that are used by Photoshop. • RGB = red, blue, green • CMYK = cyan, magenta, yellow, black How do you know which one to use?

  8. RGB: • An ADDITIVE color model in which red, green, and blue light are added together to reproduce a broad array of colors. • The combining of all 3 primaries creates white light. • The main purpose of this color model is for display of images in electronic systems, televisions and monitors, and conventional photography.

  9. CMYK: • An SUBTRACTIVE color model in which cyan, magenta, yellow and black inks (pigments) are MIXED together to reproduce a good array of colors. • Used by the professional printing industry. Also known as 4/C PROCESS.

  10. RGB vs. CMYK: • RGB: Additive color • White is the combination of 3 primary light colors • Black is the absence of light. • CMYK: Subtractive Color • White is the natural color of paper • Black results from a full combination of colored inks.

  11. Which one should I use? • RGB: • Art that is for computer display:websites or digital games. • CMYK: • Art that will be printed on paper: brochures, books and posters.

  12. How do I set the color mode? • IMAGE menu  MODE • FILE menu  NEW DOCUMENT

  13. What happens if I use the wrong color mode? • RGB is capable of a wider range of brighter colors than CMYK. • This range is called the color GAMUT. • Colors will “shift” unpredictably when printed.

  14. RGB CMYK

  15. Ms. Edelman Sunday, October 5, 2014 Welcome eager young artists! • Copy for homework: • What color model would you use to make a poster? • How do you mix white? • What are the additive and subtractive color models? • What is color gamut? AIM: what is a color model?

  16. How do I choose colors in Photoshop? • WINDOW menu  Color • CMYK mode sliders from 0-100

  17. Use the OPTIONS menu to switch color models. • RGB mode sliders from 0-255

  18. What is foreground and background color? Default foreground and background colors. Switch foreground and background colors. Click to set foreground color. Click to set the background color.

  19. What is the COLOR PICKER? • Click on foregroundorbackground squares to access color the picker.

  20. What is the Paint Bucket tool? • Fills an area or selection with the active foreground color. • Shortcut: G

  21. EREXCISE: • Create a new document: 3x3”, RGB, 72 dpi • Save as: yourname_RGB.psd • Use the paint bucket to make the background black.

  22. Create a new layer and name it RED. • Use the Elliptical Marquee to create a circle in the upper left. • Show the SWATCHES palette, found under the WINDOW menu. • Click the first red square to choose as the foreground color. • Use the Paint Bucket to fill the selection.

  23. Duplicate the RED layer and re-name it GREEN. • Select the top green square in the Swatches palette. • Use the Paint bucket to repaint the new circle. • Use the Move tool to drag the green circle to the right, but still overlapping the first one.

  24. Duplicate the GREEN layer and re-name it BLUE. • Select the top DARKER BLUE square in the Swatches palette. • Use the Paint bucket to repaint the new circle blue. • Use the Move tool to drag the blue circle to the bottom center, but still overlapping the top two.

  25. Select the BLUE layer. • Click on the LAYERS MODE popup box. • Choose LINEAR DODGE (ADD). • Select the GREEN layer and also choose LINEAR DODGE (ADD).

  26. What did we just prove? • We created WHITE by combining the 3 primary light colors: RED, GREEN, BLUE. • We created the LIGHT SECONDARY colors by combining 2 primary colors:YELLOW, MAGENTA, CYAN. • The layer mode LINEAR DODGE (ADD) tells Photoshop to display the layers in ADDITIVE light.

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