You can see the masking because it has changed color. Go ahead and
click Exit Bitmap Mode by clicking the Red Circle with the X in
it or pressing the Escape Key.
Next, select the Optimize palette. If it's not visible, go to Window>Optimize
to bring it up.
Now, you're already familiar with the Quality button as that's what
's always been used to optimize your images. The new feature is
the Selective Quality right below it. That is what you will use
to optimize the area you masked out earlier.
Go ahead and click the Selective Quality
icon to bring up the dialog box.
You can experiment with the settings here
but don't be afraid to bring the quality way down. Since the area
you're compressing here is not the focal point of your image, it's
OK to bring the quality down here.
Preserve Text and Button Quality options
are helpful when you are optimizing graphics part of a navigation
bar or menu.
You can also change the overlay color
here by clicking the color swatch.
As you work with different compression settings, be sure to Preview
your settings using the preview window or by clicking your F12 key
to Preview In Browser.
You can also modify your Selective JPEG by going to Modify>Selective
JPEG>Restore JPEG Mask as Selection. Your masked selection will
be highlighted again.
You can now make changes to the size or
shape of the selection.
I also recommend you play with the Smoothness
settings on the Optimize menu. Smoothing can help soften the jagged
lines you get when compressing JPEGs as well as reducing file size.
The higher the number the more smoothing/blurring. I used a smoothing
setting of 1 for this example.
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