the colour mode relates to the type of colour being used/offered by the programme. print uses cmyk but digital images are in rgb mode so photoshop is needed. photoshop designed for rgb preferably. rgb colour is light colour so produces many more variants.
colour gamut refers to the range of colours available. the rgb colour gamut exists widely outside of the cmyk gamut so many colours are unachievable in cmyk. working with photos but for print creates problems because of this.
started with an rgb image and to check what colour are outside the cmyk range use view>gamut warning to show. everything in grey is outside.
to get round this we might adjust the saturation, hue, or tones of the image so that colours are inside the cmyk range.
you can also use view>proof colours which lets you still work in rgb but the preview on screen shows you what it looks like in cmyk. this is a recomended work flow by photoshop designers.
using swatch pallette in photoshop is similar to illustrator. can save and replace swatches and swatch palettes to folders. to add new colours to the palette use the colour picker and go add swatch. if a colour is ourside the cmyk range it will have a exclamation mark by it and by clicking that photoshop will give you the closest cmyk colour.
we then went on to look at working with spot colours and using the pantone colour library. the colour picker has access to the colour libraries and so you can access spot colour like pantone
working with duotone images - printed with two inks. only works with greyscale images.
you can select the colours you want to use for the duotone
the curve can be used to adjust the colour coordination and hue and coplour placementsdgqetg;j;r3'334kjbzrrsvakjbgr
With duo tone it is possible to achieve colour combinations that work with the original greyscale information that makes up depth in the image. The extent to which one colour mimics light or dark can alter the aesthetic and look of an image like below.
Viewing the channels in Photoshop enables you to see each layer of additive or subtractive colour which makes up an image allowing for better colour coordination or substitution.
By choosing new spot channels you can substitute rgb for any colour and play around with colour layering.
You can save these new spot channels and even apply spot channel colours to specific areas with the brush tool giving an image a sort of psychedelic look.
Changing the solidity will effect the saturation of a colour but also the shading definition because thicker colour wil allow less tonal information through.
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