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.

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