Unit 78: Digital Graphics

Picture Resolution

When taken on a camera if the resolution is low it may be harder to see on a cameras however you can change the settings obviously if you are going to print out on A4 then the resolution doesn't have to be super high however in certain professions for example if you wanted to blow the picture up onto the side of a bus then the resolution would have to be a lot higher so that the image isn't pixelated on the bus. In the image below you can see the affect that increasing the amount of pixels per inch can do, in the first image there is theoretically 4 pixels 

Image Resolution

This is the resolution when the image is printed, the higher the amount of pixels per inch the image has the better quality the image will be. To make the highest quality image you want a high dpi(dots per inch) fro example 3000. When printing the resolution would be a lot bigger because the ink dots can be a lot closer together than what is shown on screen. This mean you can also fit more 'pixels' on printed page than you can do on screen. So you should never print at the same resolution as the on screen resolution.

Intensity 

There are many different shades between black and white, especially in Photoshop there are millions. A computer represents one colour with a colour code and three colours red, green and blue. So the one pixel value is made from vectors of three different colours. Technically, pixel intensity is its brightness, the histogram shows you how many pixels are at a certain intensity when compared to others in the same image. Black is on the left and white on the left and intensity increases as you move to the right. There are ways to have Photoshop have you show the intensities of each individual colours red, green and blue.