Color data (RGB) of IODP Hole 386-M0090D

Color data obtained from split core sections from the above given hole of International Ocean Discovery Program (IODP) Expedition 386 (Japan Trench Paleoseismology) during the onshore phase. The onshore phase of expedition 386 took place between 2022-02-14 – 2022-03-15 onboard D/V Chikyu. After longitudinal splitting of the core sections, high-resolution (100 pixels/cm) images of archive half was captured using the Tri-Sensor Core Logger (TSCL; NS Design). The camera provides a 16-bit red-green-blue (RGB) color (48-bit) TIFF file from which the RGB data were derived in 1 mm down-core resolution. For each section: 1) the TIFF file (from line scanning) full resolution was opened and channels scaled to 0-255; 2) TIFF file cut at top (2475 px) and bottom (2470 px + length of the section x resolution); 3) for every line of pixel down section, R, G, B values were averaged over a width of 450 px across the centre of the section (\~4.5 cm width) and data placed into a table compiling all sections of a hole; 4) for every depth interval, where a piece of sponge was observed on the linescan, R, G, B data were deleted; 5) R, G, B data were also deleted to the top and bottom ~1 cm of each section, to account for possible gaps or pieces of liner.For further methodological information see methods chapter in Strasser, M. et al., 2023 https://doi.org/10.14379/iodp.proc.386.102.2023

本数据集的颜色数据采自国际大洋发现计划（International Ocean Discovery Program, IODP）386航次（日本海沟古地震学研究）上述钻孔的岸基科考阶段所获取的岩心分段。该航次386的岸基阶段于2022年2月14日至2022年3月15日在D/V Chikyu（地球号）钻探船上开展。首先对岩心分段实施纵向劈分，随后采用三轴岩心测井仪（Tri-Sensor Core Logger, TSCL; NS Design）对存档半岩心采集分辨率为100像素/厘米的高分辨率图像。该相机可输出16位红绿蓝（RGB）48位总色彩深度的TIFF文件，据此以1毫米的岩心纵向采样分辨率提取RGB颜色数据。针对每个岩心分段的处理流程如下：1）打开线扫描得到的全分辨率TIFF文件，并将各色彩通道的像素值缩放至0-255区间；2）按照岩心分段顶部（2475像素）与底部（2470像素 + 分段长度×分辨率）的坐标裁剪TIFF文件；3）对岩心纵向的每一行像素，取分段中心宽度450像素（约4.5厘米）范围内的RGB值求平均，并将数据汇总为整合该钻孔全部岩心分段的数据集表格；4）删除线扫描图像中存在海绵附着痕迹的所有深度区间对应的RGB数据；5）同时删除每个岩心分段顶部和底部约1厘米范围的RGB数据，以消除岩心衬管间隙或碎屑可能引发的干扰。更多方法学细节可参考Strasser M.等人2023年发表的《IODP Proceedings 386》方法章节：https://doi.org/10.14379/iodp.proc.386.102.2023