Weeks 1 and 2 Labs
Original Image 1 
Adjusted Image 1 - Curves only 
Adjusted Image 1 - Levels and Curves 
Original Image 2 
Adjusted Image 2 - Levels and dodge layer 
Original Image 3 
Adjusted Image 3 - Hue/saturation adjustment 
Please see notes in the psd files for details of the changes made.
Weeks 1 and 2 Review Questions
1. How do Adjustment layers work and what are some of the benefits of implementing them?
An adjustment layer contain correction information which is applied to all layers underneath it. It does not affect the layers above it.
The main benefits are that they allow changes to be made, without affecting the original pixels, and are editable at any time.
The adjustment layers can also be reordered to change which layers they affect.
2. Explain in your own words what a Histogram is.
A graphical representation of the number of pixels in each of the brightnes levels from 0-255.
3. Explain what is happens to an image's pixels when you adjust the overall brightness and contrast using Levels? Hint: This comes right out of the Understanding Histograms and Levels lecture).
You redistribute the pixels over a different range. The aim is to spead the pixels over an equal range of bright and dark values via each colour chanel. This should give a more balanced, brighter image.
4. What does non-destructive mean in relation to working within Photoshop?
Non-destructive is when there are no permanent adjustments to original pixels.
5. List two creative uses for the Non-Destructive Burning and Dodging technique you just learned.
Can be used to improve the colour saturation in certain areas of a photograph or graphic . Can also be used to add highlights or deepen shadows.
6. What are some of the differences between the Curves command and the Levels command?
Curves give you more control than levels as you can change some of the brightness values while leaving others unchanged.
You can make very precise adjustments via individual channels
7. Why wouldn't you want to use the brightest or darkest pixel reading in an image to color correct?
Shadows and highlights are very rarely pure white (255R 225G 255B) or black (0R 0G 0B). If they were there would be no detail in them. If you seleced the brightest or darkest pixel in an image it could be a piece of dust or a scratch etc. You would therefore want to use an area which is 7-8 pixels in size.
8. Explain the purpose of using a neutral gray in an image when color correcting.
A neutral gray represents the midtones. Greys are used as they have the same values in all channels. If the grey of an image has too much of one colour channel then it is likely that the rest of the image does too.
9. How does the Threshold command aid in color correction work?
The threshold command allows you to easily identify highlight and shadow areas in your image which you can then use the colour sampler to select so that you can use the information on the info pallet to input these point in your curves colour channel as your input values.