https://blog.kvv213.com/2016/01/sovremennaya-tehnologiya-tsvetokorrektsii-v-photoshop-ppw-i-drugie-idei-dlya-by-strogo-uluchsheniya-izobrazhenij-modern-photoshopcolor-workflowthe-quartertone-quandary-the-ppw-and-other-ideas-for-spee/