Color data (RGB) of IODP Hole 386-M0093A

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（日本海沟古地震学）指定钻孔的岩心拆分段，采集于该航次的陆上作业阶段。386航次的陆上作业时段为2022年2月14日至2022年3月15日，作业平台为深海钻探船“地球号”（D/V Chikyu）。
将岩心段沿纵向劈开后，使用三轴岩心测井仪（Tri-Sensor Core Logger, TSCL; NS Design）对存档半岩心拍摄分辨率达100像素/厘米的高清图像。该相机可输出单通道16位、总48位的红绿蓝（RGB）色彩TIFF文件，由此以1毫米的岩心垂向分辨率提取RGB颜色数据。
针对每个岩心段的处理流程如下：
1) 打开线扫获得的全分辨率TIFF文件，并将各色彩通道的数值缩放至0-255区间；
2) 对TIFF文件进行裁切：顶部裁切至2475像素位置，底部裁切至（2470像素 + 岩心段长度 × 图像分辨率）的位置；
3) 针对岩心垂向上的每一行像素，在岩心中心宽度450像素（约4.5厘米）的范围内对R、G、B通道数值取平均，随后将数据整合为包含该钻孔所有岩心段的数据表格；
4) 针对每一个深度区间，若在线扫图像中观测到海绵残片，则删除对应位置的R、G、B数据；
5) 同时删除每个岩心段顶部和底部约1厘米范围内的RGB数据，以规避可能存在的岩心间隙或衬管碎片带来的干扰。
更多方法学细节请参阅Strasser M.等人2023年发表的研究中的方法学章节，链接：https://doi.org/10.14379/iodp.proc.386.102.2023