Quick Tip 109

To quickly draw a selection around the contents of a layer, right-click (Windows) or CTRL-click (Mac) the layer's preview in the Layers palette and choose Set Selection To Transparency Mask. Then, choose Select | Save Selection to save it as a mask to be used for weighted optimization.

Optimize palette. Select the appropriate file format (GIF, JPEG, PNG-8, PNG-24, or WBMP).

When an optimization setting can be weighted, a small circle inside a square appears next to it in the Optimize palette. If the circle is filled in, it indicates weighted optimization is currently in use for that setting.

|i Optimize \ [►]

Settings: ( [Unnamed] w }


[GIF i ] Lossy:




! Selective i ] 0| Colors:



[ Diffusion v ) Dither:

40 M


To use weighted optimization, click the icon next to the appropriate setting: Dither, Color Palette, Lossy, or Quality. In the dialog box that appears, specify the use (Text Layers, Vector Shape Layers, or a specified Channel) and adjust the setting below. A preview of the mask is also shown; white areas receive the maximum setting you specify, while black areas receive the minimum amount. Click OK to save or click Cancel to go back without saving.

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