Controlling Document Size And Resolution; Resampling - MACROMEDIA FIREWORKS 2-USING FIREWORKS Use Manual

Controlling document size and
resolution
Choose Modify > Document > Image Size to open the
Image Size dialog box and change the document's
dimensions, print size, and resolution.
Image Size dialog box
To resize an image in Fireworks:
Choose Modify > Document > Image Size.
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The Image Size dialog box opens.
Enter numbers in the Pixel Dimensions fields to
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set the new horizontal and vertical dimensions
for the image.
By default, the document's current dimensions are
displayed in the Pixel Dimensions fields. If
Resample Image is unchecked, Pixel Dimensions
cannot be changed–only the resolution or Print
Size may be changed.
Enter numbers in the Print Size fields to set the
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new horizontal and vertical dimensions of the
image when it is printed.
Enter a number in the Resolution field to change
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the resolution of the image.
If Resample Image is checked, changing the
Resolution also changes the Pixel Dimensions.
To maintain the same ratio between the
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document's horizontal and vertical dimensions,
check Constrain Proportions.
Uncheck Constrain Proportions to resize the width
and height independently from one another.
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Check Resample Image to add or remove pixels
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when resizing the image to approximate the
same appearance at a different size.
Click OK.
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Resampling

Resizing bitmap images always presents a unique
problem–do you add or remove pixels to resize the
image, or do you change the number of pixels per inch or
centimeter?
One way to adjust the size of a pixelated image is to
adjust the resolution, which changes the size of the pixels
in the image so that more or fewer pixels fit in a given
space. Another way to adjust the image's size is to
resample the image.
When an image is resampled, pixels must be added or
removed to make the bitmap larger or smaller. Either
way, the image is altered, which can result in some
quality loss at the target resolution.
Downsampling, or removing pixels to make the
image smaller, always causes quality loss because
pixels are discarded to resize the image.
Resampling up, or adding pixels to make the image
larger, may result in quality loss because some pixels
are being added to make the image larger, and the
pixels that are added do not always correspond pixel-
for-pixel to the original image.
Resampling in Fireworks differs from most image
editing applications; Fireworks contains pixel-based
bitmap image objects and vector-based path objects.
When an image object is resampled, pixels are added to
or removed from the image object to make it larger or
smaller. When a path object is resampled, little quality
loss occurs because the path is redrawn mathematically
at a larger or smaller size.
However, since path objects in Fireworks are composed
of pixels, some strokes or fills may appear slightly
different after resampling because the pixels that
compose the stroke or fill must be redrawn.
Note: When you resize an image, guides, hotspot
objects, and slice objects are resized with the image.