The exercises made using Photoshop all took the same reference image. Here is the original.
The color of the telephone cabin was changed to three diferent colors. Click the image for the tutorial.
Similar work was done, only this time instead of replacing the color with another color, it was replaced by a pattern. Click the image for the tutorial.
This exercise consists of making the whole image black and white except for one particular element.Click the image for the tutorial.
The exercise consist of making a degradé between the image in color and the image in Grayscale. Click the image for the tutorial.
This exercise uses the same method as seen before, but it is now used to overlap two different images in which the top one has the gradient effect. Click the image for the tutorial.
This last exercise consists of a gif animation made with the images in Color Replacement exercise.