About Resampling - MACROMEDIA FIREWORKS 8-USING FIREWORKS Use Manual

2.
In the Pixel Dimensions text boxes, enter new horizontal and vertical dimensions.
You can change the units of measure. If Resample Image is deselected, you can change the
resolution or print size but not pixel dimensions.
3.
In the Print Size text boxes, enter horizontal and vertical dimensions for the printed image.
4.
In the Resolution text box, enter a new resolution for the image.
You can select between pixels/inch and pixels/cm as the units, or select Resample Image.
Changing the resolution also changes the pixel dimensions.
5. Do one of the following:
To maintain the same ratio between the document's horizontal and vertical
dimensions, select Constrain Proportions.
Deselect Constrain Proportions to resize width and height independently.
6.
Select Resample Image to add or remove pixels when resizing the image to approximate the
same appearance at a different size.
7.
Click OK.

About resampling

Fireworks resamples images differently than most image-editing applications do. Fireworks
contains pixel-based bitmap image objects and path-based vector objects.
When a bitmap object is resampled, pixels are added to or removed from the image to
make it larger or smaller.
When a vector object is resampled, little quality loss occurs because the path is redrawn
mathematically at a larger or smaller size.
Because the attributes of vector objects in Fireworks are visible as pixels, some strokes or fills
may appear slightly different after resampling because the pixels that compose the stroke or fill
must be redrawn.
Guides, hotspot objects, and slice objects are resized when the document's image size
is changed.
Resizing bitmap objects 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?
You can alter the size of a bitmap image by adjusting the resolution or by resampling the
image. When adjusting the resolution, you change the size of the pixels in the image so that
more or fewer pixels fit in a given space. Adjusting the resolution without resampling does not
result in data loss.
44 Chapter 2: Fireworks Basics