RGB Colour Gamet and CMYK colour Gamet
RGB is photoshops default colour mode
When you change the colour mode from RGB to CMYK the colours on your document will shift ready to print, colours tend to go a lot more duller. We don't want to work on photoshop with great colour and then print and the colour is not what we expect.
When you work in CMYK some features of photoshop aren't available, CMYK files are larger
View-Gamut Warning
Gamut Warning- Turns the image silver and show us colours that are not going to look the same once printed
to change large areas of gamut you can use levels
proof colours- shows on screen how the image is going to look when you convert to CMYK but the mode of the image is still RGB, sometimes called a CMYK preview
Work in RGB mode until you finish editing your image. Then convert the image CMYK mode and make any additional colour and tonal adjustments. Especially check the highlights and the shadows of the image.
top icon on the right next to your colour choice is to do with printing and the second icon is web safe colours, by clicking them it will then convert them into web safe or ready to print
Using spot colours in Photoshop
Monotone inks- needs to be in grey scale first and then you can choose a spot colour, this ink is always changeable
Duotone- both of the inks will mix exactly on top of each other when printing, it changes the overall tone of the colour
By choosing the box next to the colour controls the amount of ink used, when moved around it can change the image dramatically, it works very much like the curves adjustments on photoshop, it allows you to stylise the image.
The more inks you add the more expensive it will be to print, the technique can also be useful when screen printing
Channels
using spot colour channels is a very common practice for screen printing to prepare the image
The spot ink appears a transparent ink, on the different channels created you can also add in text ect.
ink the ink gets more opaque the higher the solidity is, this is very useful when designing for print, you can see on screen how things are going to look even to the transparency of the ink
when saving the image it is important that spot colours are ticked, it is best if you save it as a TIFF file for best quality
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