file formats

Photoshop has it's own file which is an adobe photoshop file. It is found as (.psd) This file keeps layers and types in photoshop.

Illustrator also has it's own file which is an adobe illustrator file. It is found as (.ai) This file keeps layers and types in illustrator.

GIF. This file is found as (.gif) This file compresses the files so they end up small. This file is not good for detail and is very rarely used for printing.

PNG. This file is found as (.png) It also compresses the file but is better quality. Also saves the transparent area so that the green does not come up in the white background.

JPEG. This file is found as (.jpg) This file format is the most popular. It compresses the file into small files. When it does so it has standard quality.

EPS. This file is found as (.eps) With this file you can save something that is very small. Then when you open it again you can enlargen it and it will not lose any quality.

TIF. This file is saved as (.tif) This is the best file format to use and it has the best quality.

PDF. This file is found as (.pdf) This file gets smaller when it saves. Anybody can open it When you save as a pdf in photoshop it will keep the original layers and types etc.

In illustrator you can also save as a scalable vector graphics. This is found as (.svg)

This is an example of an animation GIF file.                                              This is a still GIF file.

                                               













This is a PNG file with a transparent background.            This is the picture that i have put in a                                                                                                         coloured background.

   

vector and rasta graphics

In photoshop, we show pictures in pixels, these are called rastagraphics.

To turn something into pixels is to rasterise.

Illustrator- these show images as vector-graphics it doesn't show them in pixels.

When you zoom in on illustrator the image won't break up.

The pictures are made up tiny little shapes and the computer re draws the shapes when we zoom in so the picture does not break up.

Illustrator is good for flat shapes and colours. This is where there are no difference between the colour and another in a small area.

Illustrators no good for trying to show tones as a vector graphic.

Good for animating, they re draw the pictures really quickly

It's good for web based graphics when when you have to make things bigger.

Here are some examples of rastagraphics in Photoshop:



You can seethe little squares that are called pixels. This is where the rastagraphics appear ad the picture has broken up. Whereas in illustrator the picture zoomed looks like this:



The picture does not break up as you can see it is still clear.

theory

Colour Space:

Colours in photoshop are shown as little squares.

Colour space is how the colours are used in an image.

they are pieces of light through a screen.

Three colours:

The three colours used in photoshop are Red, Green and Blue.

These three colours are the primary colours of light.

The colours are broken up for us to see. 

There are 256 tones in these colours.

The lightest colour of all three is white. and the darkest black.

Print:

C M Y K are the printing colours.

They stand for, cyan, Magenta, Yellow and Black. 

When printing there aren't as many colours to choose from than in light.

When you print something it prints 4 times to include al 4 colours.

Gamut is the range of colours in an image.

If its out of range it can't print. 

Pixels:

They are single small squares.

Each square includes R G B each at a certain tone.

Ive uploaded this picture to photoshop. this is the original.

This is the photo without any red channels in it.

 Now the photo without any green channels.

Lastly without any blue channels.

How much a photo takes up, the size of this can be measured in:

• file size
• Document
• Pixel size = 72 pixels per inch

optimum resolution is always best.

pixels per inch matches up to the amount of pixels on your screen. 

You only measure in dots when you are printing. 

When printing to make the printing faster and the picture clearer, take away all of the layers apart from the original. The best size for print is 300ppi.            

A photo of a snake with 72 ppi.