What is Spot Colour?
Spot colours or PMS (Pantone Matching System) refer to a colour or ink that has been specifically mixed and calibrated to a colour matching system such as Pantone. It is a similar process to picking out paint swatches – a colour is picked from a catalogue of PMS.
- Also known as a Pantone colour.
- Single shade/tone of solid colour.
- Printed using pre-mixed ink.
- Consistent from job to job.
- Usually have a unique ID code.
What is a Process Colour?
- Also known as CMYK printing.
- Colour simulated by a dot (dither) pattern known as halftoning.
- Not actually “solid” colours.
- Millions of colours possible from three inks.
- Impossible to print certain colours.
Spot Colour vs Process Colour
- Spot Colours are solid regardless of magnification.
- Process Colours will exhibit visible dots or “noise” at higher magnifications.
Spot Colour Matching
- The process of matching a process (CMYK) printed colour to an existing colour.
- Existing colour could be a solid Pantone colour, or even another process colour.
- Usually carried out using a RIP (Raster Image Processor), or by trial & error!.
Why Epson Spot Color Function
- RIP is
- Very comprehensive features tool
- Support for multiple file types
- Complicated to use
- Expensive to buy
- Epson Spot Color Tool (Color Tone Matching Assistance Tool)
- Easy to use, even for novices
- Free to all
- Support ColorWorks
- No need to amend the artwork
- Up to 32 spot colours per layout
- Supported by standard driver
What is it used for?
Spot colour will allow the user to guarantee a particular colour to be printed in a desired shade. This is critical for operations like branding, or any time you need to print a specific colour in a print set.
For example, Epson or Coca-Cola™ Logo always have specific colour as below. Companies always wanted to maintain this specific colour Shade to represent the Company.
- Obtain the RGB value of the colour to be converted
- Obtain the RGB value for the target Colour
- Create the Spot Colour list on the printer
- Print the results using the Spot Colour List using Printer Driver
Obtain the RGB value of the colour to be converted
Obtain the RGB value for the colour that needs to be converted / printed into a new colour
Open the image using Microsoft Paint
- Click on the Color Picker
- Click on the colour that you want to change
- Picked colour is displayed as (3)
- Click on the Edit Colors
- Please note down the RGB value (R:239, G:228, B:176)
Obtain the RGB value for the target Colour
Obtain the RGB value for the target Colour
- Start the Color Tone Matching Assistant Tool
This lets you enter the RGB settings of the original colour, creates some sample colours by slightly changing the original RGB settings, and then lets you print the samples. You can choose a target colour and print the neighbouring RGB values and colours on the printout.
- Select the Target Printer
- Select correct Media details i.e. Matte Paper, Normal Printer Quality, width, and length
- Try and set the RGB value to match the target colour
- Click Print and the results as below:
- Note down the RGB value for Target colour
Create the Spot Colour list in the printer driver
Create a text file called “SpotColorTable.txt”
- First Entry
- The RGB value of the colour to be converted
- Second Entry
- The new RGB value for the new target value
- Example of “SpotColorTable.txt”
- Place the “SpotColorTable.txt” in the following directory:
- ColorWork C7500:
- C:\ProgramData\EPSON\EPSON TM-C7500
- ColorWork C7500G:
- C:\ProgramData\EPSON\EPSON TM-C7500G
- It can be used for solid monochrome colour conversion such as logo.
- Up to 32 replacements can be specified on separate lines, additional lines discarded
- There is no ON / OFF setting of the function in the driver UI. (Switches with or without SpotColorTable.txt)
- Non numeric or incorrect format lines are discarded
- Values exceeding 255 are divided by 256 and remainder is used
- Driver Ver.22.214.171.124 or later （Released on Jun./19/2019）
- Supported Firmware Ver. WAI32000 or later.
Print the results using the Spot Color List using Printer Driver
Finally, Print the results
For information How to use Windows Colour Correction Mode and Image Colour Management (ICM) for CW-C6x00, please refer to the following article: