benekli 2025.1

tool to investigate the effect of color profile

This project is still a work-in-progress.

benekli

benekli is a helper utility for soft proofing images. It has two purposes:

• generate soft proofs of the images/photos (i.e. how a photo would look like when it is printed)
• calculate color difference (delta E) between the original and soft proofs, so the best representation can be selected

Soft proofing can be done in many applications including Adobe Photoshop. However, it is cumbersome to use it with multiple images, with multiple simulated profiles and with different proofing options (e.g. rendering intent, black point compensation). This process can be easily automated with benekli.

The color difference (delta E) can be calculated with some applications or tools, but it is not that common in user applications. benekli can calculate delta E according to CIE 1976, CIE 1994 or CIEDE 2000 formulas and it generates an RGB image representing the delta E values.

benekli is a Turkish word meaning spotted, speckled or mottled in English, i.e. benekli elbise means spotty dress.

Installation

benekli is a Python application using Pillow imaging library. It can be installed from pip.

$ pip install benekli

This installs the Pillow dependency. Required Pillow modules; littlecms2, libtiff and jpg are checked in runtime.

Check the installation with:

$ benekli

Usage

To soft proof Bill Atkinson's Fourteen Balls test image (which is an extreme example in ProPhoto RGB color space) for my printer (Epson SC-P800) using Epson Archival Matte paper (and I saved the profile of my display as display.icc):

$ benekli -v -s SC-P800\ Series\ Epson\ Archival\ Matte.icc -d display.icc -i FourteenBalls.tif -o FourteenBalls.p.bpc.tif -r p --bpc

 INFO:     benekli.py: input image is RGB
 INFO:     benekli.py: using the embedded profile in FourteenBalls.tif
 INFO:     benekli.py: image profile: ProPhoto RGB
 INFO:     benekli.py: simulated profile: SC-P800 Series Epson Archival Matte
 INFO:     benekli.py: display profile: SW271 1_D50_L100_G22_2025-03-18T14.58.41Z
soft proof generated: FourteenBalls.p.bpc.tif

generates FourteenBalls.p.bpc.tif soft proof.

Be aware that what you will see below will be different depending on how wide the color gamut of your display is. I am checking these on a wide-gamut display with ~100% AdobeRGB coverage. You can test your display at wide-gamut test page.

License

Copyright (C) 2025 Mete Balci

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.