How do you optimize an image?

this seems easy and it should be, but for some reason i am having an issue. For my class we are suppose to optimize our images,
this should be a simple thing, however, when i click on my image in fireworks and go into the optimize panel and change it, it doesn't
change the image i have selected, but the entire document instead. so how do i make fireworks optimize the image i have selected, instead of the
whole document? (we can't use any other program either, just fireworks, so no PS or anything else)

You do your design work and save it to a native Fireworks .png file. This file format is an enhanced version of a standard .png file and contains the additional data for the vector objects, code exports, and other information that is specific to FW. Other programs that read .png files can read FW .pngs, but they will ignore the extra informations.
When you want to produce output for the Web, you need to select an image type and optimize it, based on the image content. Your optimize settings will be saved when you save the FW document, but the document maintains its original data and does not change. It is the output file that gets optimized.
To produce an image for the Web, you use export, instead of save. Personally, I like using the File>Image Preview... menu. From there, I can choose my output file type and the parameters for the file. There's also File>Export Wizard...
If you decide you want to export to one of the .png formats, you need to be careful to export to a different file name from your working FW document, or you can overwrite your master file with a flattened file, losing all your work. I read a suggestion here to name FW documents as .fw.png as a reminder, but you still need to watch what you're doing.
For file formats...
JPEG stands for Joint Photographic Experts Group and this format is optimized for photographs or other images where the variation in color between adjacent pixels is low. When you optimize .jpg images, you have controls for compression/quality and also for adding sharpness.
GIF is a good format when you have line art with few colors. This format uses a palette of 256 or fewer colors, one of which can be fully transparent. This format also can support animations.
PNGs (bitmap) come in three versions. PNG24 is a full-color image with no transparency; the 24 bits are 8bits each of red, green, and blue. PNG32 is a full color image with full transparency; 8 bits each of red, green, blue, and alpha. PNG8 is a limited palette similar to the GIF, but you can have semitransparent colors.
There appears to be a long-standing bug in Fireworks where, if you choose GIF or PNG8, Fireworks may not give you all the colors in your image. You can manually add colors using the eyedropper.
Hope that helps!

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