You have to specify a transparent color of each frame to create an image with transparent background.
You have to specify a transparent color of current layer to make a selection transparent.
GraphicsGale does not have the eraser tool.
All you have to do is painting a canvas with a background color.
GraphicsGale treats one of colors as transparent area.
Layers and frames can have their transparent color.
If a transparent color of a layer is set, the area filled with that
color is transparent and its under layers are visible.
A transparent color of a frame is applied as a transparent color of an
image file which supports transparency such as a GIF.
If an image has an alpha-channel, a transparent color of a layer is invalidated.
If you don't need an alpha-channel, invalidate an alpha-channel with any one of the following ways.
Yes. You can use the GraphicsGale for any purpose, even commercially.
Besides, it's not necessary to pay a royalty.
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