OUGD405: Photoshop Induction

Photoshop uses pixels: 

72 for screen, 1080 for film/high resolution television, 300 for print (from the print industry)- depends on the human eye, close up the pixels need to be higher- lower resolutions can be used for billboards which are far away.  

Optical colour mixing: 

Dots of colour can change two colours into one due to how the eye views colour. Dots of colour look like they are one instead of two. 

Theory of pixels: Chuck Close

Uses of colour: RGB for screen, CMYK for print- Use RGB for photoshop

Changing RGB to CMYK

RGB is colour informed by light- 

"The RGB color model is an additive color model in which red, green, and blue light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three additive primary colors, red, green, and blue.

The main purpose of the RGB color model is for the sensing, representation, and display of images in electronic systems, such as televisions and computers, though it has also been used in conventional photography. Before the electronic age, the RGB color model already had a solid theory behind it, based in human perception of colors."

This means that RGB is used in photoshop to gain a wide range of colours for design on screen, however this theory of colour cannot be applied to printed design. Printed colours are limited to allow for consistency. 

Print- CMYK

"The CMYK color model (process color, four color) is a subtractive color model, used in color printing, and is also used to describe the printing process itself. CMYK refers to the four inks used in some color printing: cyan, magenta,yellow, and key (black)."

This also means that extremely bright colours cannot be printed, CMYK colours tend to be darker as they can only be made out of inks rather than light. 

This diagram illustrations how light can create a broader range of colours than inks because generally eyes can see and react to more colours.