1. Open Photoshop. Open an image to
try retouching commands.
2. We will try Auto Levels
first.
3. The Level are used
to adjust the tonal balance of an image moving the sliders manually.
It gives more precise results. But for the beginners, Photoshop
provided the Auto Levels command
which does the same operation automatically.
Auto Levels adjust each color channel individually.
4. Image > Adjustments
> Auto Levels

5. The image is clear and sharp.
6. Make a duplicate of the original image by right
clicking on the blue title of an image and select Duplicate.

7. We will try Auto Contrast now.
8. Auto Contrast does
not adjust the channels individually like Auto Levels. It detects
the lightest and darkest pixels in an image, setting them to white
and black making highlights appear lighter and shadows appear darker.
9. Image > Adjustments > Auto Contrast

10. Make another duplicate of the original image by
right clicking on the blue title of an image and select Duplicate.
11. We will try Auto Color
this time.
12. Auto Color is
the quick way to remove color cast throughout an image.
13. Image > Adjustments
> Auto Color

14. Keep all the images side by side to make out the
difference between these commands.
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