Exercise 6 - Basic Image Corrections

Display the Rulers. What is the keyboard shortcut ? Ctrl R

Display the Grid. What is the keyboard shortcut ? Ctrl '

Use the Measure tool to draw a line down the centre of the façade following the joins in the bricks. Record the following:
a) How long is the line in pixels and in cm ? 6cm, 708px
b) What is the angle of the line ? 92.6

Open the Curves palette and adjust so the image has a full tonal range and good overall brightness (Gamma correction).
What has happened to the histogram ? The avaliable tonal range has been spread to reach both ends of the spectrum. By stretching the tonal range of the image it creates gaps ('comb' effect) along the histogram because of the limited tonal range of the original image.

What is the difference between changing the image size vs. changing the canvas size ?
changing the 'image size', resizes the image (changing the pixels ect). When changing the 'canvas size' the image quality remains the samehowever the size of the image is cropped to whatever size is requested.


Use the Clone stamp tool to remove a window from the façade of the building.Turn ON the ‘Align’ option, set a soft brush with a diameter of 20pixels, and ‘Alt + click’ in the brickwork to set the point to start copying from.
a) How does the behaviour change when the ‘Align’ option is turned off ?
When the align option is turned ON you can reproduce the sample image area. when it's OFF you can only repeat the area in which you have sampled.