Title bar on images in photoshop will tell you the name of the image, percentage you're viewing and the colour mode.
RGB is the default colour mode on Photoshop.
There is a wider spectrum of colours available with RBG.
Gamut means range.
Change the colour mode by going to image, mode and then select CMYK.
Changing the mode will alter the brightness and saturation in order for it to print.
More options are available when working in RGB.
File size in RGB is smaller
Gamut
Original image with and without gamut warning.
Vibrancy makes colour sit outside of the gamut.
Decreasing the saturation makes the colours fit with the gamut.
Adjusting the levels can also work.
To refine this only adjust the colours that are out of the gamut, an adjustment layer can do this.
You can also use 'proof colours' it makes the image slightly duller. It turns on the CMYK preview even though it is still an RGB file.
Before you save convert from RGB to CMYK.
Swatches
Foreground and background colour tool, colour palette and swatches can be used to select colours.
To delete swatches press 'alt' and click on them. Save the empty swatch box as a file to ensure you don't have to do it every time. Make sure you have at least one swatch.
To add a swatch change the foreground colour to what you want then click inside the swatch palette.
To get the saved palette up go to the swatch menu and click 'replace swatches'.
For other programmes use 'save swatches for exchange'.
To build a swatch palette use the colour picker, make sure the colours you pick are inside the printable area.
Click the box under the exclamation mark to go to the closest printable tone.
Spot colours
Access the spot colour libraries by clicking on the foreground colour to bring up the colour picker. Then click 'colour libraries'.
To find a colour you know just type in the reference number.
By just using the colour selected as it is, it loses its unique reference number. Therefore it is no longer a spot colour and is just a mixture of ink.
Duotone
Creating a duotone image. Using a greyscale image and a spot colour which accents the grey scales within the original image.
Convert your image to grey scale. Levels may need to be adjusted.
Go to image, mode, duotone. Then select a spot colour from the colour libraries.
If you ever want to change to chosen colour it is easy to go back and just alter it.
Use the duo tone curve to alter the grey scale values.
Save as a photoshop file.
Colour channels
Channels define the colour within an image, always black and white.
Dark areas where there is a lot of the colour and lighter where there is not so much.
Channels can be used to save information on selections.
Use a selection tool to select an area and then click 'save selection as channel'.
When the selection is turned on it will appear red.
You can make more accurate selections using the paint brush.
You can also use 'new spot channel' from the menu and select a spot colour from the libraries.
Again use the paint tool to apply where you want the colour.
You can use this technique to add spot varnishes.
To save an image with a spot colour channel make it a photoshop file. Make sure 'spot colours' is checked.
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