Color data (RGB) of IODP Hole 386-M0088C

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取自国际大洋发现计划（International Ocean Discovery Program, IODP）386航次（日本海沟古地震研究）指定钻孔的岩心分割样品，采集于该航次的陆上作业阶段。IODP 386航次的陆上作业于2022年2月14日至2022年3月15日在“地球号”（D/V Chikyu）科考船上开展。岩心样品经纵向分割后，使用三传感器岩心测井仪（Tri-Sensor Core Logger, TSCL; NS Design）对保存半岩心拍摄分辨率为100像素/厘米的高分辨率图像。该相机可输出16位红绿蓝（RGB）彩色（48位）TIFF文件，研究人员据此以1毫米的岩心纵向分辨率提取RGB颜色数据。针对每个岩心段的处理流程如下：1）打开线扫得到的全分辨率TIFF文件，并将各通道的数值缩放至0-255区间；2）对TIFF文件进行裁切：顶部裁切2475像素，底部裁切至（2470像素 + 岩心段长度 × 分辨率）的位置；3）沿岩心纵向的每一行像素，在岩心中心宽度450像素（约4.5厘米）范围内对R、G、B值取平均，随后将所有岩心段的数据整合为一张包含该钻孔所有岩心段的表格；4）对于每一个深度区间，若线扫图像中观测到海绵状沉积物，则删除该处的R、G、B数据；5）同时删除每个岩心段顶部和底部约1厘米范围的RGB数据，以规避可能存在的岩心间隙或衬管残留的影响。更多方法学细节可参考Strasser M.等人2023年发表的《IODP航次进展386》第102章，链接：https://doi.org/10.14379/iodp.proc.386.102.2023