On 25/04/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> On Tue, 24 Apr 2007 20:57:43 +0200, Sven Neumann <[EMAIL PROTECTED]> wrote:
>
> > Hi,
> >
> > On Wed, 2007-04-25 at 02:41 +1000, Jasper Schalken wrote:
> >> This is what I thought was a bug (I posted
> >> herehttp://bugzilla.gnome.org/show_bug.cgi?id=432978) but Sven Neumann
> >> says I should discuss it on here first.
> >
> > Your video shows the blur tool being used on large areas of black color
> > and small areas of white color. The average of this is a dark gray. Now
> > when you continue to blur, you are mixing a dark gray with black. If you
> > go further, you end up with all black.
> >
> > But there could very well be rounding errors in the blur tool code.
> > There are even most definitely rounding errors as we are only working
> > with 8bit per channel and rounding errors are unavoidable then. But
> > please take a look at the code and see if there's anything we could
> > change to improve this.
> >
> >
> > Sven
>
> Jasper , your bug says:
>
> >> It's algorithm
> >> appears to favour dark colours when they are included in the blur.
>
> Why do you say that? Does it still favour dark colours if the image is
> predominantly white?
>
> >> From my understanding, the average lightness of a given image should
> >> always
> >> remain constant as it is blurred.
>
> What is your understanding , of what blur tool?
> Is there some specific blur algorithm that you believe does preserve
> lightness or is this just an assumption you were making?
>
> Maybe you could be more precise about what blur you are refering to ,
> there are several IIRC.
>
> Please try to be a little more specific about what you are reporting.
>
> Thanks.
>
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