When using Photoshop and Illustrator.
Photoshop works using pixels and light to create an image where as illustrator uses vectors. Photoshop allows you to be free with the art work that you create as you have a lot of freedom where as because illustrator uses vectors it restricts you as to how much you can do, however if photoshop images are enlarged they can lose their quality. too the point that the image is hardly recognisable like this;
Illustrator isn't for creative art work, but it is excellent for professionals such as architects, for when they are creating building designs, because the use of vectors allows the to be able to enlarge images so that they can focus on one area of an image without it being blurred. It allows them to work at a much larger scale and in far more detail.
When you are using computer programs like Photoshop you need to be careful and have a full understanding of what you need from an image such as the quality of the image you need for what you are doing with it. For instance is you are printing an image the quality of the image should be set to 300 DPI (dots per inch). That allows 300 dots of light per inch in the image that are in a straight line. However if you are using an image for the web then you need the quality of the image to be set to 72 DPI (dots per inch). This is because you don't want the image to be too large as it will take up too much memory as it would be a large file, and it also allows the image to load quickly, as the larger the image the longer it takes to load.
resolution, however when an image in on the web is should on be 72% resolution.
It is also all about colour, for example you have
RGB which is on the screen it is used in photoshop, as the colours mixed together create light (white), which are the colours RED, GREEN and BLUE
CMYK, these are the colours used when printing, they are the colours, CYAN, MAGENTA, YELLOW, BLACK. Together they make black.
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