This bachelor thesis is aimed on issue of examining wood colour changes during the process of drying. Thesis is divided into four chapters. In the first chapter we focus on wood colour, sensing colour, how human eye is able to saw colour and colour shades.For colour measuring we can use measuring device such as colorimeter and spectrophotometer or colour sampler. Second chapter describes colour changes in wood drying process. This colour change is often considered as imperfection so it´s necessary to examine wood colour, its changes and causes of these changes as well.