Website for the Optimal Method – a technique for calibrating printing processes
Animation – see the Optimal Method in action!
TAGA Presentation / Paper (4/2004) – the basis for the G7 method
TAGA Presentation / Paper (4/2005) – early work on Bernstein polynomial curves
PAB Presentation (5/2005) – print buyers want standards
Color Measures Presentation (6/2005) – GATF "Learning Lunch"
CTV Presentation (7/2005) – the basis for the ISO 20654 standard
CTV Formulation (7/2005) – the math details
Calibration to Appearance (12/2005) – GATFWorld article
Generic Matching Tool Presentation (11/2006) – explains what G7+ tries to fix
Proposed Changes to ISO 12647 (4/2007) – compare to current work on ISO 12647-2
Defining Grey (7/2009) – adopted by G7+ fifteen years later
Color Tool Kit Presentation (2/2016) – a bit of history
TAGA Presentation / Paper (3/2016) – color management with OBAs
TAGA Presentation / Paper (3/2018) – explains the above flowchart
Optimal Method Presentation (9/2021) – calibration by minimizing color errors
PressCal Presentation (9/2021) – key software features
FLEXO Magazine Article (9/2022) – origin of the Optimal Method
FTA Fall Conference Presentation (10/2022) – Optimal Method for flexo printers
Animation comparing curve methods (10/2022) – see the difference
FTA Membernar (12/2022) – Fall Conference encore
FTA FORUM Presentation (4/2023) – ECG and spot colors
FTA 2023 FORUM Presentation annotated PowerPoint (4/2023) – large file
FTA 2023 Fall Technical Conference "Horses" Poster (12/2023) – large file
FTA Membernar PDF/X-5n ECG Workflow Diagram (2/2024)
FTA Membernar (2/2024) – Fall Conference encore – large file
Doppelganger, LLC
Graphic Arts Consulting, LLC
This web site was created to supplement our TAGA presentation in March, 2018. Since then, there has been interest in using our software tools commercially. Our latest effort (March, 2024) is version 16.4CU. See PressCal Changes (below) for details. (A new version that runs on macOS Sequoia is available on request).
PressCal_16.4CUV (universal curve software, macOS Big Sur to Sonoma) – updated 2024-03-08
PressCal_16.4CU (universal curve software, OS X 10.10 to 10.15) – updated 2024-03-08
PressCal User Manual (16.4U) – updated 1/2024
PressCal Sell Sheet – updated 4/2023
PressCal Changes – updated 2024-03-08
PressCal Checklists (offset and flexo) - updated 8/2024
PressCal Test Charts
Example Press Forms
PressCal Customization – updated 4/2023
ECG Tools – updated 2024-06-20
Open Source License (GPLv3) – free as in speech
The links below are to the Color Tool Kit, a collection of Perl modules used by PressCal. These modules are included in the PressCal software download.
Color Tool Kit (CPAN)
Color Tool Kit Documentation – updated 7/2024
Color Tool Kit (optional modules for Mac OS)
Installing the Color Tool Kit (Mac OS)
Installing the Color Tool Kit (Windows)
The links below are to other open source software packages used by PressCal.
MacroMates website (TextMate home)
Perl website (PressCal is written in the Perl programming language)
Levmar website (PressCal uses levmar for optimization)
Argonne website (levmar is based on MINPACK software)
R website (PressCal uses the Rmath statistical function library)
RGraph website (PressCal uses RGraph for graphics)
"As we enjoy great Advantages from the Inventions of others we should be glad of an Opportunity to serve others by any Invention of ours, and this we should do freely and generously."– Ben Franklin
