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Re: Transparent PNG alpha channel window
Posted: Tue May 10, 2022 6:29 am
by Olli
netmaestro wrote:How to achieve faster performance for the blur ?
If we have a set of pixel like below:
If we grab this set and display it in two times :
- in a left shift
- in a right shift
through an graduate alphablending, the result is:
This provides a blur on a line.
Now, on a plane, let's imagine 8 specific alpha values for the 8 directions over a pixel :
where a = sqr(2)/4 and
b = 1/2
If we do a grab of an image and apply 8 copies of this image matching the eight following shifts:
Code: Select all
x y alpha
-1 -1 a
-1 0 b
-1 +1 a
0 -1 b
0 +1 b
+1 -1 a
+1 0 b
+1 +1 a
A fast blur is done. We can make fast blur, but the cumulative result is not mathematical. So, we must choose between a slow perfect blur, or a fast cumulative blur.
Re: Transparent PNG alpha channel window
Posted: Tue May 10, 2022 4:00 pm
by Caronte3D
Blur is an expensive algorithm, I think the only solution to get good speed/quality on large sizes, is to use the GPU
I hope someone have the knowledge to do it, would be a nice effect for many things.
Kudos!
Re: Transparent PNG alpha channel window
Posted: Fri May 13, 2022 6:20 am
by punak
@netmaestro: Have you seen this source? i do not know if it runs on Windows 8 or not. it is possible to find out what method he uses to blur the window?
https://github.com/alexmercerind/flutter_acrylic
for Windows 8: (free)
http://glass8.eu/guide
I just do not know how to use these in pb.
Re: Transparent PNG alpha channel window
Posted: Wed May 18, 2022 5:55 pm
by punak
@netmaestro : do you have any news of the progress of the work to present?