[Gimp-user] 8 and 1 bit images

Thanks for your reply and advice.
Maybe it's a personal preference but the guy who was replying to my
thread at fsdeveloper.com suggested that I export the BLEND mask
(layer where everything the user doesn't want to show painted with a
25% BLACK brush so the edges are a greyscale and blend nicely) as a
8bt 256 grayscale TIFF image and the water mask which is painted with
a 100% BLACK brush as a 1 bit 2 color (black and white) TIFF.
I guess they both can be as small as possible although he also reckons
the 'compile file' (which uses the original satellite image and the
water and blend mask image files) ends up smaller too. Once again just
a preference of his to have all files as small as possible.
I have in the past exported the mask/layer as a 24 bit BMP file and it
all worked ok. Of course the BMP files are much larger.

Well, heed your experts advice.

A couple of points, that you might already know.

The 'paint tools' have their own opacity setting. No need for a 25% brush.

The Paint Tool introduces anti-aliasing at the edge. For the 1 bit indexed image
the anti-aliasing is 'lost'. Otherwise for 'hard' edges use the pencil tool.

Exporting as a tiff is not a problem, Use Mode -> Greyscale for 8 bit and 

remove any alpha channel, then Mode -> Indexed -> black and white (1 bit) for
that mask.

rich: www.gimp-forum.net

* http://www.gimpusers.com/system/attachments/697/original/tools.jpg

rich404 (via www.gimpusers.com/forums)

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