Statistical Process Control for Stochastic Textured Surfaces R package spc4sts version 0.6.5 Provides statistical process control tools for stochastic textured surfaces. The current version supports the following tools: (1) generic modeling of stochastic textured surfaces. (2) local defect monitoring and diagnostics in stochastic textured surfaces, which was proposed by Bui and Apley (2018a) <doi:10.1080/00401706.2017.1302362>. (3) global change monitoring in the nature of stochastic textured surfaces, which was proposed by Bui and Apley (2018b) <doi:10.1080/00224065.2018.1507559>. (4) computation of dissimilarity matrix of stochastic textured surface images, which was proposed by Bui and Apley (2019b) <doi:10.1016/j.csda.2019.01.019>. Software Imports: rpart, gridExtra, parallel Anh Tuan Bui <atbui@u.northwestern.edu> Comprehensive R Archive Network (CRAN) Anh Tuan Bui [aut, cre], Daniel W. Apley [ths] GPL-3 2025-08-21 application/tgz https://CRAN.R-project.org/package=spc4sts doi:10.32614/CRAN.package.spc4sts