*************README file for********************************************************************** Collection of digitized gravure printed samples for the analysis of hydrodynamic pattern formation ************************************************************************************************** Authors of TUdatalib submission: Pauline Brumm, Tim Eike Weber, Nils Lindner, Hans Martin Sauer, Edgar Dörsam Technical University of Darmstadt, Department of Mechanical Engineering, Institute of Printing Science and Technology (IDD), Magdalenenstr. 2, 64289 Darmstadt, Germany Last modified: 2021-05-14 --------------------- 1. GENERAL In this TUdatalib submission, you will find high-resolution digital images of all 3840 printed fields as used in the following publication for the analysis of hydrodynamic pattern formation during ink splitting in gravure printing: Ink splitting in gravure printing: localization of the transition from dots to fingers Pauline Brumm, Tim Eike Weber, Hans Martin Sauer, Edgar Dörsam Journal of Print and Media Technology Research (JPMTR), 2021 DOI: 10.14622/JPMTR-2016 To download from: http://jpmtr.org/index.php/journal/index In the publication, the digitized printed samples were used in their raw form for analysis of the printed patterns, but for better data handling and smaller data volume, we upload only the cut-out printed fields in lossless tif-format, see folders 'images_KXX-KXX_....zip'. Please beware that each folder is about 2 GB to 3.5 GB large and contains between 336 to 528 images. The total number of images is 3840. In addition to the collection of images, you will find the following data: - This _README.txt - experiment_IDs.csv --> See also Section 2. HOW TO DEAL WITH THE IMAGES? - diagram_data.csv --> Tabular data for reproduction of the diagram in the publication; classification results for samples with red ink on paper --------------------- 2. HOW TO DEAL WITH THE IMAGES? - The meaning of the file names The image files are named according to their printing parameters. Example: K01_A1_V3_048LCM_45RW_120SW_080TW.tif K01 --> Experiment identification number (ID); defines printing speed, substrate and printing ink; a list of all experiment IDs together with printing speed, substrate and printing ink is provided in a separate file 'experiment_IDs.csv' A1 --> Redundant information; stands for the used segment of the printing form which contains two different raster frequencies, e.g. A1 = {048LCM, 054LCM} V3 --> Number of printing run; normally three subsequent printing runs --> V1, V2, and V3, but sometimes also more --> e.g. V0, V1, V2, V3, V4, V5, V6, V7 048LCM --> Raster frequency 48 lines/centimeter (L/cm) 45RW --> Raster angle 45° 120SW --> Stylus angle 120° 080TW --> Tonal value 80 % Used printing parameters are: Given by experiment ID: Printing speed: 20 m/s, 30 m/s, 45 m/s, 60 m/s, 75 m/s, 90 m/s, 160 m/s Substrate: Paper, foil Printing ink: Red ink, diluted red ink, blue ink Raster frequency: 40 L/cm, 48 L/cm, 54 L/cm, 60 L/cm, 70 L/cm, 80 L/cm, 90 L/cm, 100 L/cm, 120 L/cm, 140 L/cm Raster angle: 45° Stylus angle: 120° Tonal value: 5 %, 10 %, 20 %, 30 %, 40 %, 50 %, 60 %, 70 %, 80 %, 90 %, 95 %, 100 % Over 3600 fields on over 150 samples were printed in total (10 printing speed/substrate/ink-combinations x 5 segments x 2 clusters x 12 fields x at least 3 printing runs = over 3600 fields = 3840 fields). Exception: For K36_A1_..., only one printing run was performed and analyzed (K36_A1_V1_...), thus you will NOT find K36_A1_V2_... and K36_A1_V3_... --------------------- 3. IMAGE CREATION Samples were printed on the laboratory GT+W Superproofer 220 printing machine at IDD. All printed samples were scanned with a color-calibrated flatbed scanner at 2400 dots per inch (dpi) with 16 bit lightness values per RGB color channel. Fields of size 1040 x 1040 px (= 11 x 11 mm) were cut out from the digitized samples. 2400 dpi means that each pixel has a size of 10.5833 micrometers. The printing direction goes from bottom to top in all images. --------------------- 4. CONTRIBUTIONS Contributions to this TUdatalib submission: Pauline Brumm: Organized the data for upload to TUdatalib; supervised master thesis of Tim Eike Weber and Nils Lindner; manually cut out missing fields from the printed samples Tim Eike Weber: Printed and scanned all samples within his master thesis at IDD Nils Lindner: Wrote a python script within his master thesis at IDD to automatically cut out the fields from the printed samples Hans Martin Sauer: Helped organize the data for upload to TUdatalib; supervisor of the research project; head of the research group functional printing at IDD Edgar Dörsam: PI of the research project and head of IDD --------------------- 5. ACKNOWLEDGEMENTS We kindly acknowledge the financial support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project-ID 265191195 – SFB 1194 ‘Interaction between Transport and Wetting Processes’, project C01. Besides, we kindly thank Thorsten Euler for his help in operating the printing machine. --------------------- 6. LICENCE This data collection is released under the creative commons licence condition of CC BY-ND. --------------------- 7. FURTHER INFORMATION For more details take a look at our publication (DOI: 10.14622/JPMTR-2016), see Section 1. GENERAL.