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List:       kde-kimageshop
Subject:    Re: SelectionTool
From:       Juliet Blosser <juliet () spirit ! firinn ! org>
Date:       1999-08-24 13:40:37
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On Thu, Aug 19, 1999 at 01:53:37PM +0200, Matthias Elter wrote:
> On Wed, 18 Aug 1999, Andrew Richards wrote:
> (...)
> > Selections are going to have to be very tricky (probably one of the hardest 
> > things to implement well). I believe a greyscale layer may be the way to go. 
> > Remember that the selection must be able to be feathered (ie it must be 
> > able to have an alpha channel). Also remember that some selection mechanisms 
> > produce very big selections (select by colour for example) and these would 
> > probably be better described by a layer than by a set of vectors. The dynamic 
> > tile allocation of layers should keep small selections small, however, 
> > We could implement a simple selection mechanism now but that would probably
> > have to be replaced later.
> 
> Hm, how are you going to render the selection? Animated selections (moving
> rubber band) are a must as it really helps to see complex selections. How do
> you propose to make the selection based on a grayscale layer visible? Render
> the layer into the image? This is to slow for animated selections. 

One handy thing Photopaint does with selections, and this is particularly
nice with feathered selections, is show them in vector format within the 
image, but provide a separate optional dialog that shows the selection
in shades of a rather bright red color over the image.  (I believe the
image is shown in greyscale at that point.)  IMO it's even easier to figure
out what feathering is going to do that it would be if it were drawn 
directly on the image.

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