Questions and Answers
Every image on screen is composed of three colors: red, green, and blue. True or False?
True
To access the channels tab, you can click on the 'window' and then select 'channels'. True or False?
True
The RGB channel combines all three colors to give the RGB composite. True or False?
True
The Red, Blue, and Green channels are represented in black & white. True or False?
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If you have trouble watching the layers in black & white, you can change it by going to Edit menu and then selecting 'preferences'. True or False?
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The main reason why the Red, Blue, and Green channels are represented in black & white is that these are only a representation of those channels. True or False?
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In Photoshop, to see all your channel layers in their respective colors, you need to check the checkbox for 'Show Channels in Color' in the ____________ tab of Preferences.
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When the Red channel is completely black, it indicates that there is ____________.
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The Green channel may appear brighter than the other channels due to its ____________ hue.
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In the Blue channel, the sky appears bright because ____________.
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A channel with very bright skies and a very dark foreground can be used as a mask to select the skies, and in this case, it is the ____________ channel.
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Histograms are an important tool in image editing programs like Photoshop, Photoshop Elements, Adobe Lightroom, and ____________.
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A histogram can help determine whether an image has been properly exposed, the nature of its lighting, and ____________.
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Each pixel in an image has a color produced by a combination of ____________.
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In a digital image, the brightness value for each primary color (red, green, blue) ranges from ____________.
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The RGB histogram counts how many pixels are at each brightness level from 0 through 255 for each of the primary colors ____________.
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Study Notes
Image Composition
- Every image on screen is composed of three colors: red, green, and blue.
Accessing Channels
- The channels tab can be accessed by clicking on the 'window' and then selecting 'channels'.
RGB Channel
- The RGB channel is a combination of all three colors (red, green, and blue) to give the RGB composite.
Color Representation
- The Red, Blue, and Green channels are represented in black & white because they are only a representation of those channels.
- To see all channel layers in their respective colors, you need to check the checkbox for 'Show Channels in Color' in the Preferences tab.
Channel Characteristics
- A completely black Red channel indicates that there is no red in the image.
- The Green channel may appear brighter than the other channels due to its green hue.
- In the Blue channel, the sky appears bright because it has a lot of blue.
Channel Masks
- A channel with very bright skies and a very dark foreground can be used as a mask to select the skies, and in this case, it is the Blue channel.
Histograms
- Histograms are an important tool in image editing programs like Photoshop, Photoshop Elements, Adobe Lightroom, and Capture One.
- A histogram can help determine whether an image has been properly exposed, the nature of its lighting, and the distribution of tones.
Pixel Color
- Each pixel in an image has a color produced by a combination of red, green, and blue.
Brightness Value
- The brightness value for each primary color (red, green, blue) ranges from 0 to 255 in a digital image.
RGB Histogram
- The RGB histogram counts how many pixels are at each brightness level from 0 through 255 for each of the primary colors (red, green, and blue).
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