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| Any time you resize an image, it can result in poorer image quality. |
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| When converting to Lab Color, the Channels palette will display three channels: Lightness, a, and b. |
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| When a background is busy or shaded, it can be necessary to take some creative steps to remove it. |
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| Many design professionals prefer to use the Desaturate command when converting to black and white because it permits precise control of shades, levels, and the conversion process. |
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| The Channel Mixer can be used with color or black and white, with all channels, one channel, or even a selection in the image. |
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| When you plan to print a photo professionally, you may have to convert it from one color model to another. |
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| Selecting a snapshot lets you work from that version of the image unless you have chosen the Allow Non-Linear History option in the History palette options. |
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| Alpha channels created from selected areas use black paint to mask and white paint to reveal, by default. |
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| Photoshop can insert detailed information into a photo if need be, even if it was not captured from the original image. |
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| If you click a snapshot and begin editing from that image, Photoshop begins a new branch of edits — the other edits are lost. |
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| To play back a recorded action, it must be saved with the image, or its action set must be loaded into the image. |
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| Photos will start to look crisper, with more detail, as they are downsampled. |
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| RGB and CYMK are subsets of the Lab color space. |
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| You can organize sets of actions for different types of work, such as online publishing or print publishing, and then transfer sets to other computers. |
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| The Curves command makes nonlinear adjustments via control points to make highlight, midtone, and shadow adjustments. |
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| By default, bitmap, grayscale, duotone, and indexed-color images have one channel. |
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| If you need to move a shape or layer by just a little bit, you can select the Move tool and then press a function key on the keyboard to nudge the object by 1 pixel. |
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| An action is created in a manner similar to that of a tape recorder. |
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| Layer masks create more permanent masks than alpha channels. |
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| The main difference in Photoshop’s color adjustment tools is in the amount of control each tool provides. |
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| The Lab color mode tries to emulate the colors viewable by the human eye. |
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| Turning off the display of thumbnails can have a negative impact on performance. |
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| Masks created via the Layers palette can be performed on the background layer, whereas alpha channel masks cannot. |
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| With multiple versions come inevitable color mode, tonal adjustments, and sizing issues. |
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| A moiré pattern is an alternating of blurred and clear areas, forming thin stripes or dots on the screen. |
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| The nearest neighbor interpolation method is a fast method that produces a smaller file size but which may become jagged when scaling as it tries to preserve hard edges. |
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| The RGB color mode is independent of the type or device or media, and may be used for either display or printing. |
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| A grayscale image has just one channel. |
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| The RGB mode calculates each color description, rather than generating it from a combination. |
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| Photoshop uses the Image Size dialog box to make choices about the number of pixels, the document size, and the resampling method. |
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| The number of default color channels in an image depends on its file size. |
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| If you upsample, Photoshop assigns a new color to the pixel based on an average interpolation. |
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| Before you resample, it is important to check with your lab or service bureau, as some services automatically resample and resize at the time of printing. |
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| If your image has layers with styles applied to them, select Scale Styles in the Image Size dialog box, to scale the effects in the resized image. |
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| The Auto Contrast command automatically assigns the black point to the darkest pixel and the white point to the lightest pixel in an image, clipping shadows and highlights. |
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| When making an alpha channel, you can create the channel first and then paint the selected area, or you can select the area first and then create the channel. |
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| After recording an action, you can delete image-specific steps and then insert an action stop using the palette menu. |
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| The solution to halos around the edges in an image is to use Defringe matting. |
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| Because Lab colors are combinations of colors, they may look different on different devices. |
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| Photoshop uses a resampling method that assigns a new color value to pixels by taking a sample of the surrounding ones. |
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| From a design perspective, using shapes helps direct the viewer to important details. |
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| You must be careful when you record actions that involve selecting a named layer. |
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| The submissions you make to service bureaus and labs are highly printer independent. |
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| Channels are created automatically when you open a new image. |
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| When you display an alpha channel at the same time as a color channel, the alpha channel appears as a transparent color overlay in the document window. |
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| Snapshots are saved when you close a file. |
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| The bilinear interpolation method is a slow but precise interpolation method based on an examination of the values of surrounding pixels, which applies more complex calculations to produce smoother tonal gradations. |
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| A printed image will have a red, green, blue, and black channel. |
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| Performing color adjustment using the Layer menu allows you to experiment with color and tonal adjustments first, before committing them to the image. |
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| Photoshop allows you to convert directly from RGB to Lab color mode; however, using the intermediary CMYK mode gives you more flexibility in color changes and contrast. |
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