Photoshop is an application that today sets the standard and will continue in the market thanks to its features. Many tutors may not find a starting point in teaching, but I have the technique of starting at the center of everything and that is photography. from the histogram approach, going through each corresponding adjustment and applying appropriate mathematical theory that prevents the user from having to arbitrarily use the controls in order to obtain a result. For this, it is essential to know about color, its characteristics, the representation of the same in their CMY tones, how each tone is represented with its saturation and luminosity values, this seeks to level a photo that, due to the use of RAW in the cameras or the non-calibration of their white balance, we have to perform manual techniques