1 我把你的句子合并起来,看看你是否理
in the past,many famous painters meticulously ground their own colors,which was an attention to detail that is noteworthy--------现在,后面部分成了定语从句.也就是说,an attention to detail that is noteworthy是说明in the past,many famous painters meticulously ground their own colors的.
2 that is noteworthy是修饰整个短语an attention to detail 的,不是修饰detail的.
3 所以,可以说,an attention to detail that is noteworthy 与in the past,many famous painters meticulously ground their own colors的关系在你的句子里是同位语关系.
4 翻译：
在过去,许多画家在颜色调配方面非常小心,在现在看来,对这一细节的注意是有必要的.是说 to detail 和 that is noteworthy都是修饰an attention 的嘛？对，修饰attention.