Adobe 65011817 User Guide - Page 68

Adjust tonal range in bitmaps, Adjust highlights, midtones, and shadows with Levels, Highlights

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USING FIREWORKS CS4 62 Working with bitmaps 4 Click the thumbnail of the new bitmap object in the Layers panel to select the bitmap object. 5 Apply a Live Filter from the Property inspector. Fireworks applies the Live Filter only to the new bitmap object, simulating the application of a filter to a pixel selection. Adjust tonal range in bitmaps A bitmap with a full tonal range must have an even number of pixels in all areas. Three options are available for adjusting tonal range: using Levels, using Curves for precise control, or using Auto Levels for automatic adjustments. The Levels feature corrects bitmaps with a high concentration of pixels in the highlights, midtones, or shadows. Highlights Corrects an excess of light pixels, which makes the image look washed out Midtones Corrects an excess of pixels in the midtones, which makes the image bland Shadows Corrects an excess of dark pixels, which hides much of the detail The Levels feature sets the darkest pixels as black and the lightest pixels as white, and then redistributes the midtones proportionally. This produces an image with the sharpest detail in all of its pixels. Original with pixels concentrated in the highlights; after adjusting with Levels Use the Histogram in the Levels dialog box to view the pixel distribution of a bitmap. The Histogram is a graphical representation of the distribution of pixels in the highlights, midtones, and shadows. The Histogram helps you determine the best method of correcting an image's tonal range. A high concentration of pixels in the shadows or highlights indicates that you could improve the image by applying the Levels or Curves feature. The horizontal axis represents color values from darkest (0) to brightest (255). Read the horizontal axis from left to right: the darker pixels are on the left, the midtone pixels are in the center, and the brighter pixels are on the right. The vertical axis represents the number of pixels at each brightness level. Typically, you adjust the highlights and shadows first. Adjusting the midtones second lets you improve their brightness value without affecting the highlights and shadows. Adjust highlights, midtones, and shadows with Levels 1 Select the bitmap image. Last updated 3/8/2011

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62
USING FIREWORKS CS4
Working with bitmaps
La
s
t updated 3/8/2011
4
Click the thumbnail of the new bitmap object in the Layers panel to select the bitmap object.
5
Apply a Live Filter from the Property inspector.
Fireworks applies the Live Filter only to the new bitmap object, simulating the application of a filter to a pixel
selection.
Adjust tonal range in bitmaps
A bitmap with a full tonal range must have an even number of pixels in all areas. Three options are available for
adjusting tonal range: using Levels, using Curves for precise control, or using Auto Levels for automatic adjustments.
The Levels feature corrects bitmaps with a high concentration of pixels in the highlights, midtones, or shadows.
Highlights
Corrects an excess of light pixels, which makes the image look washed out
Midtones
Corrects an excess of pixels in the midtones, which makes the image bland
Shadows
Corrects an excess of dark pixels, which hides much of the detail
The Levels feature sets the darkest pixels as black and the lightest pixels as white, and then redistributes the midtones
proportionally. This produces an image with the sharpest detail in all of its pixels.
Original with pixels concentrated in the highlights; after adjusting with Levels
Use the Histogram in the Levels dialog box to view the pixel distribution of a bitmap. The Histogram is a graphical
representation of the distribution of pixels in the highlights, midtones, and shadows.
The Histogram helps you determine the best method of correcting an image's tonal range. A high concentration of
pixels in the shadows or highlights indicates that you could improve the image by applying the Levels or Curves
feature.
The horizontal axis represents color values from darkest (0) to brightest (255). Read the horizontal axis from left to
right: the darker pixels are on the left, the midtone pixels are in the center, and the brighter pixels are on the right.
The vertical axis represents the number of pixels at each brightness level. Typically, you adjust the highlights and
shadows first. Adjusting the midtones second lets you improve their brightness value without affecting the highlights
and shadows.
Adjust highlights, midtones, and shadows with Levels
1
Select the bitmap image.