The thing we are interested in is the mode of the file in photoshop. Along the title bar of the document, it always tells you information about whats type of file it is (RGB/CMYK).
When we work in print, we want to work in CMYK.
At the moment the colour mode is RGB, I want to change it to CMYK. This is important to change because their different models, the main difference is RGB can display way more colours on screen that are not possible to print.
To convert, I simply go to IMAGE > MODE > CMYK.
DON'T change until to CMYK until you have finished you design.
The image below has been completely optimised,
go to VEIW> GAMUT WARNING.
This will show us a gray overlay.
Everything that is gray will NOT PRINT.
Click Garmut warning to check you design, if you see this above go to adjustments and play around until its completely normal again. Do this by going to adjustments.
Another good way to change the image so its back to normal is going to VEIW > PROOF COLOURS
THIS WILL MAKE THE IMAGE RGB/CMYK. This means that you are seeing on screen what you will see when you change it to CMYK. This will give you a visual representation of how it will really look.
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We now need to know how to work with colour in Photoshop.
WINDOW > SWATCHES
This is very similar to the swatch palette in Illustrator
To delete swatches, PRESS ALT AND CLICK!
To save the swatch palette, do the same as Illustrator, Go to the menu for Swatches and click SAVE SWATCHES.
How do we work with colour? Applying colour is simple, fill sections, paint brush tool etc.
LAB COLOUR : A Lab color space is a color-opponent space with dimension L for lightness and a and b for the color-opponent dimensions, based on nonlinearly compressed CIE XYZ color space coordinates. - wikipedia
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YOU MUST CONVERT YOUR IMAGE TO CMYK BEFORE EXPORTING INTO INDESIGN.
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SPOT COLOURS
Go to your colour picker and click COLOUR LIBARYS.
In this tab, you will be able to chance the mode.
To select what PANTONE NUMBER YOU WANT. Simply type.
Any colour I put in won't work, always remember to change the mode before saving and transferring to other programs or printing.
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This image is gray scale. If you want to change the image into A DUETONE, make sure you check the levels.
If you want to add more colour, simply go to TYPE and change how many colours you want.
To change the CURVES of the Duotone simply click the line that goes through the square next to 'ink1'
To save this just save it as a photoshop file, that spot colour will then go through into INDESIGN.
To reset duetones, go back to you setter and set CMYK to all 0.
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PART 2:
This image is gray scale. We are going to use CHANNELS instead of layers.
CHANNELS strore information about colour in the image. If i look at the colour palette it will give me small thumbnails for the colours I have, for example RED GREEN BLUE or in this case just gray.
Channels can also store information about selections,
APLHA CHANNELS- SAVING SELECTIONS : Press 'save selection as a channel'. This is very handy when you are using the same selection over and over, this will unsure that you will never loose a selection.
They can also be used to save information about spot colours. Again this doesn't apply to gray scale images.
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