Graphics Programs Reference
In-Depth Information
5 Select the Filter effects mask to activate it. This is the large white square to the left of Smart Filters in
the Layers panel.
6 Choose the Brush tool ( ) from the Tools panel, and press D on your keyboard. This changes your fore-
ground and background colors to the default colors of black and white.
7 If black is not set as your foreground color, press X to swap the foreground and background colors.
Using the Paintbrush tool, paint over the image; note that where you paint with black, the blur disap-
pears. Press X to swap the colors so that white is now the foreground color, then paint over areas where
the blur is not visible to restore it. While painting, try various values: for instance, if you type 5 , you are
painting with a 50 percent opacity; if you type 46 , you paint with a 46 percent opacity. Type 0 to return
to 100 percent opacity. This is a technique that is worth experimenting with—try other filters on your
own to explore painting on Filter effect masks to hide or reveal the effect of each filter.
Review
Questions
1 Name an example of how a color sampler can be used.
2 What color mode is typically used for color-correcting an image?
3 What is a neutral? How can you use it to color-correct an image?
4 How can you tell if an image has been corrected in Adobe Photoshop?
5 What is a DNG file?
Answers
1 It is common for the Color Sampler tool to be used inside the Curves panel, where it can be used to
mark white, black, or gray points on the image. Using a Color Sampler makes it much easier to read the
data from one particular point of the image from the Info panel.
2 There are many theories as to which color mode is the best working environment for color correction.
Unless you are in a color-calibrated environment (using LAB), RGB should be the mode you choose to
work in for color correction.
3 A neutral is a gray, or a shade of gray. You can often find a gray area in an image that can be used as a
measuring tool to see if your colors are balanced. Some photographers like to introduce their own gray
card in order to have a neutral against which to balance. They then crop the gray card out of the image
when they are finished correcting the color balance.
4 By viewing the Histogram panel, you can tell if an image's tone curve has been adjusted. Even if you
make simple curve adjustments, some degradation will occur in the tonal values of the image.
5 The DNG (Digital Negative) format is a non-proprietary, publicly documented, and widely supported
format for storing raw camera data. The DNG format was developed to provide a standard format that
all camera vendors would eventually support. You can also use DNG as an intermediate format for stor-
ing images that were originally captured using a proprietary camera raw format.
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