Black & White Grey Curves
For all my black and white printing on my Epson printer, I prefer to use the Advanced Black and White mode (ABW) mode instead of the Colour mode for the following reasons.
When we print black and white images through the Advanced Black and White ABW driver, we have to tell Photoshop to let the printer manage the colours which in turn disables the option to select any RGB profiles.
By going down this route it means that the RGB values in your image are passed directly to the ABW driver without any alteration.
If you place Photoshop’s eye dropper over a pixel and find that it has RGB values (118,118,118), then (118,118,118) is exactly what Photoshop will send to the ABW driver.
Having said all that, there are a few anomalies which we need to be aware of.
- We can’t soft proof the image, even if our display is properly calibrated
- The same image will print differently on different papers
- Final reesults will depend on our choice of RGB working space
Take the two images above for example. One is is in the AdobeRGB 1998 Colour Space and the other is in the ProPhotoRGB Colour Space. Both images were filled with 50% Grey and on screen they both look identical.
However, if we look at the numbers more closely, we see that they are different. The AdobeRGB 1998 colour space shows us a value of 118 and the ProPhotoRGB colour space shows us a value of 100.
If we were to print them both out, the one in ProPhotoRGB would print darker because the value of 100 is lower than the value of 118 from the AdobeRGB 1998.
This isn’t really what we want.
All of these problems can be solved using a custom grey curve which maps the RGB working space values to the required output space values.
Introducing Paper Grey Curves
The Paper Grey Curves program is a lightweight application that is run from within Photoshop.
It will automatically generate the paper correction curve which can then be added in Photoshop just before the photograph is printed.
This will ensure that the vales we see on screen are mapped to the values the printer actually prints.
Paper Grey Curve Calculations
All the calculations for producing the mapped output values are automatically worked out for you by the use of the included Excel and Apple Numbers Spreadsheet and the measurement values you obtained from the printed step wedge.
The included spreadsheet is extremely easy to use with only 3 required steps for the user to take. Also included in the spreadsheet is an “Online Help” button which allows you to watch a series of online Video Tutorials.
Paper Grey Curve Excel Calculations
Paper Grey Curve Apple Numbers Calculations
Full VersionPaper Grey Curves
Excel Spreadsheet Included
Apple Numbers Spreadsheet Included
Main Photoshop Script
Automatically Create Curve
Manually Create Curve
Online Video Tutorials
RequirementsPaper Grey Curves
Excel Spreadsheet or
Apple Numbers Spreadsheet
Photoshop CC and Above or
Device For Measuring Print Values
Windows or Mac Operating System
Introduction To The Paper Grey Curves Program
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