SeaSide uses  "asWebImage" on a Form object to return it to the viewer.
By
default, "asWebImage" returns the image as a GIF file in 8 bits mode.
This
makes images sent from Squeak very ugly.

This changeset makes the default type PNG, which offers the same
lossless
compression and features as GIF (such as transparency, although PNG has
even a full alpha channel) but does not suffer from colormap
limitations.

I wonder whether the default change can cause trouble in existing
applications.
In mine, the benefit was immediate.
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