Given the nature advertising of my job advertising I have been tweaking images before the advent of computers. At that time we used the masks. Once personal computers has borned and with the 1st version of Photoshop which still could not work with layers I continued doing my own tweaks.
From that moment this software has always been a great ally. I have seen and experienced how masks became current adjustment layers.
The workflow has three phases or degrees of difficulty.
Phase corresponds to the most basic learning or photoshop where we edit or modify are made affect 100% of the image and they correspond to the four features that define an image: density, hue, saturation and contrast.
Phase in which we use the masks to make selective edits on an image. that is to say corrections only affect the selected portion of the image. The quality of the mask will be the determining factor that guarantees the naturalness and credibility of retouching.
without doubt the most complex phase in which starting with blank canvas. We create invented or added elements that will make up the final image. Very close to the illustration phase.without doubt the most complex phase in which starting with blank canvas. We create invented or added elements that will make up the final image. Very close to the illustration phase.
Check this video some descriptive examples that define the workflow.