Today we had an Induction on Photoshop. We started the session by talking about the differences between Illustrator and Photoshop. We spoke about the way that Photoshop uses pixels instead of vector graphics and we looked into resolution. We also talked about optical mixing and looked at examples of this. Shown below is one of the examples we looked at.
As you can see, as the bars of colour get thinner and closer together the way we perceive the colours changes and the two colours start to merge into one. This is used within print however in print dots of colour are used instead of bars.
When working with images from a camera it is important to ensure that the resample image box isn't ticked. This means that no information from the photograph will be destroyed and there will be no information created. This stops the image from losing quality. We can then change the size and resolution without losing quality. Sometimes resampling has to be used to achieve the size that is needed but it is best to avoid it. This allows us to get the best quality image possible.
We looked at the settings that are available when starting a new document. We looked at the presets available and the colour modes you can choose. We also looked at spot colours. This is when you want to use a colour that can't be made using RGB or CMYK, for example fluorescent inks or certain pantone colours.
We looked further into the difference between RGB and CMYK. RGB is used for work on screen and CMYK is used for print.
We looked at colour gamuts, this is a term I have never heard before but it essentially shows the range of colours that can be used. This diagram shows the difference in the range of colours available with CMYK and RGB. As you can see with RGB we can get a much larger range of colour than with CMYK.
Show above is the colour picker box. As you can see you can change the percentages of Cyan, Magenta, Yellow and Black and also the amount of Red Green and Blue. To the left of the cancel button there are two icons available. The icon at the top only appears when the colour that has been chosen isn't available with a CMYK colour gamut. If you click the box of colour below the icon it automatically chooses the closest colour that is print safe. The icon below shows that the colour isn't web safe and again when you click the box of colour below it it will change the colour to the closest match that is safe for web.
At the bottom of the box we can see a hash with a box with some highlighted characters next to it. This is a computer code that is used for colour in web design. It's called the hex code.
We also looked at the colour libraries menu. This allows us to choose Pantone colours and lets us be more specific with the colour we intend to use.
We looked at the difference between RGB and CMYK by changing the colour mode and using cmd&Z to switch between the two modes. This allowed us to see the difference clearly as it is fairly subtle. In CMYK the colour is less vibrant, this is most visible in the green block.
Throughout this session I feel I have learnt about the colour modes in more depth than I ever have before. I had an understanding of colour but I have learnt some vocabulary and some photoshop functions that I did not know prior to this session.
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