Banding in Gaussian blurs
Jun 17, 2015 00:17:20 #
Banding in blurred backgrounds:
Consequent to a discussion of banding in blurred backgrounds that Lighthouse noted in an image I posted in the Critique Section...
http://static.uglyhedgehog.com/upload/2015/6/15/1434380901029-image.jpg
...it seemed altogether meet and proper to show some examples of reduction of banding in areas of Gaussian blur by...applying more Gaussian blur! Depending on the image, I may choose a moderate blur that retains some color and suggestions of BG forms (using moderate pixel radii in the 25 to 40 pixel range) or a maximally intense "Gaussian Gray" blur (using the maximum of 1000 pixel radius with the greatest possible chromatic averaging approach to gray) .
Below are two comparisons:
The first in which mild banding of a colored, moderate Gaussian blur is resolved to much less perceptible banding with eleven additional passes of moderate Gaussian blur, and...
the second in which an intense 1000 pixel radius "Gaussian Gray" blur with many prominent bands is almost completely resolved with eleven passes of equally strong Gaussian blur. Careful examination will reveal five broad bands.
In summary, banding in a produced blur is just another detail that more blurring can help minimize.
Dave in SD
Consequent to a discussion of banding in blurred backgrounds that Lighthouse noted in an image I posted in the Critique Section...
http://static.uglyhedgehog.com/upload/2015/6/15/1434380901029-image.jpg
...it seemed altogether meet and proper to show some examples of reduction of banding in areas of Gaussian blur by...applying more Gaussian blur! Depending on the image, I may choose a moderate blur that retains some color and suggestions of BG forms (using moderate pixel radii in the 25 to 40 pixel range) or a maximally intense "Gaussian Gray" blur (using the maximum of 1000 pixel radius with the greatest possible chromatic averaging approach to gray) .
Below are two comparisons:
The first in which mild banding of a colored, moderate Gaussian blur is resolved to much less perceptible banding with eleven additional passes of moderate Gaussian blur, and...
the second in which an intense 1000 pixel radius "Gaussian Gray" blur with many prominent bands is almost completely resolved with eleven passes of equally strong Gaussian blur. Careful examination will reveal five broad bands.
In summary, banding in a produced blur is just another detail that more blurring can help minimize.
Dave in SD
Jun 17, 2015 00:27:22 #
Uuglypher wrote:
Banding in blurred backgrounds: br br Consequent ... (show quote)
Very good and extremely interesting stuff here, Dave. Thanks for taking the effort to make this presentation.
--Bob
Jun 17, 2015 00:27:23 #
Jun 17, 2015 01:05:32 #
Jun 17, 2015 01:21:43 #
rmalarz wrote:
Very good and extremely interesting stuff here, Dave. Thanks for taking the effort to make this presentation.
--Bob
--Bob
My pleasure, Bob,
I really wasn't sure how much interest there might be in a topic of such "Old Hat" nature...but I hadn't heard it mentioned for a long time so thought I'd toss it in and see if it got any nibbles of new interest or old recollection.
Dave
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