Color data (RGB) of IODP Hole 386-M0081F

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. […]

本数据集的颜色数据采集自国际大洋发现计划（International Ocean Discovery Program, IODP）386次科考航次（日本海沟古地震学）陆上作业阶段中，上述钻孔的岩心分劈段。该航次的陆上作业阶段于2022年2月14日至2022年3月15日期间在“地球”号（D/V Chikyu）钻探船上开展。岩心段经纵向劈分后，利用三传感器岩心记录仪（Tri-Sensor Core Logger, TSCL; NS Design）对存档半岩心采集了分辨率为100像素/厘米的高分辨率图像。该设备可输出16位红绿蓝（RGB）彩色（总48位）TIFF文件，据此以1毫米的岩心深度分辨率提取RGB颜色数据。针对每一段岩心：1）打开线扫得到的全分辨率TIFF文件，并将各通道数值缩放至0-255区间；2）将TIFF文件按岩心顶部（2475像素）与底部（2470像素+岩心段长度×分辨率）进行裁切；3）沿岩心深度方向的每一条像素行，在岩心中心宽度450像素（约4.5厘米）范围内对R、G、B数值取平均，并将数据整理为表格，汇总单钻孔的所有岩心段数据；4）针对每个深度区间，若线扫图像中观测到海绵残留，则删除该区间的R、G、B数据；5）同时删除每段岩心顶部与底部约1厘米范围内的RGB数据，以排除可能存在的岩心间隙或衬管碎片的干扰；[…]