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Weird cat whiskers
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Jan 26, 2020 17:30:19   #
Blair Shaw Jr Loc: Dunnellon,Florida
 
Golden Rule wrote:
I took this photo of my cat and cannot get rid of the strange fringe or is it moire on her whiskers on the camera right. I've tried using the moire and defringe sliders in LRCC but nothing removes the problem. Also, do you think her white bib is too gray or wrong temp. or tint? Thanks for tips on getting those darn whiskers to look normal!


Lovely Cat and those are ice wiskers

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Jan 26, 2020 18:06:46   #
Golden Rule Loc: Washington State
 
Blair Shaw Jr wrote:
Lovely Cat and those are ice wiskers


Thank you, Blair.

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Jan 26, 2020 18:49:26   #
hassighedgehog Loc: Corona, CA
 
At double download the problem goes away. It's an artifact of the resolution.

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Jan 27, 2020 16:22:58   #
raferrelljr Loc: CHARLOTTE, NC
 
Golden Rule wrote:
I took this photo of my cat and cannot get rid of the strange fringe or is it moire on her whiskers on the camera right. I've tried using the moire and defringe sliders in LRCC but nothing removes the problem. Also, do you think her white bib is too gray or wrong temp. or tint? Thanks for tips on getting those darn whiskers to look normal!


She's a real beauty, give her a hug and kiss from me. I love cats.

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Jan 28, 2020 20:50:43   #
Swamp-Cork Loc: Lanexa, Virginia
 
I just love the beautiful image of your cat!

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Jan 29, 2020 01:49:32   #
dat2ra Loc: Sacramento
 
You could Dodge the bib a bit or mask and raise the Highlights, but I like how the whiskers jump out.

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Jan 29, 2020 13:25:16   #
Scottty Loc: Portland,Oregon
 
Beautiful cat. Love the shot. Notice the pixilation. However, when I enlarged the download the pixilation disappeared.

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Jan 29, 2020 20:04:53   #
Photolady2014 Loc: Southwest Colorado
 
Beautiful cat, beautiful photo! Only if you really zoom do you see anything, I would not worry about it!

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May 25, 2020 18:12:33   #
brazenhusy Loc: Longmont, Colorado
 
Might be fun to run him through a Topaz filter.

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Jul 8, 2020 20:24:51   #
Uuglypher Loc: South Dakota (East River)
 
StanMac wrote:
Why bother with trying to correct it? I can’t see the anomaly at normal viewing size and distance. Unless you’re going to print or project the image several times lifesize it’s a non-issue, IMO.

Stan

Stan is spot-on! There is no problem of any sort at normal viewing distance. Every image has defects under the sort of “pixel peeping” that is rife here!

Dave

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Jul 12, 2020 02:16:39   #
JimH123 Loc: Morgan Hill, CA
 
Golden Rule wrote:
I took this photo of my cat and cannot get rid of the strange fringe or is it moire on her whiskers on the camera right. I've tried using the moire and defringe sliders in LRCC but nothing removes the problem. Also, do you think her white bib is too gray or wrong temp. or tint? Thanks for tips on getting those darn whiskers to look normal!


What you are seeing is quite normal. The whiskers are thin enough to be made up of very few pixels across their width. Hit the download on the top image for a look at the original. I reduced the exposure so as to see this effect better. This are a couple whiskers blown up real big so you can see the individual pixels. Also, you are seeing the effect of demosaicing going on too. Notice that there are light colored whickers along with some a bit darker before disappearing into the darkness between them. The Demosaicing process needs to compute a red, a green and a blue value for every pixel. Let's we are looking at a pixel with a red filter. To get the green value, it is going to average at least 4 surrounding green filtered pixels. And some of those pixels are dark and some are light thus we get some variability in in the darkness of the green portion of a pixel. Same thing for a blue value, and so on. And also, the whisker is not very wide, and as we travel on a whisker (let's pick the top since it is fainter). Now the whisker is going slightly up, but mostly to the right. In our travel to the right, we keep encountering a new row segment of real cat whiskers and demosaiced produced ghost pixels giving it that look. This is normal.

For the second image, I expanded the number of pixels 4x using Topaz's Gigapixel AI. Each pixel is now smaller and more of them fit within the width of the whisker. We now cannot see that effect, at least not at this magnification. At this magnification, we cannot see the stair stepping effect.

By the way, detail like this is one of the reasons some individuals pay extra bucks for cameras with very high numbers of pixels so that they don't have to see the stair stepping edges that we see here.

Also, there are many demosaicing algorithms that have been produced and what varies is how they determine what surrounding pixels to average together to be figure out accurate color and to best find edges. If you were to look real close at the pixel level, you could probably spot some differences in the results of different algorithms. For instance, RawTherapee gives the user a choice of 12 or 13 different demosaicing algorithms. And also, I dabble in astrophotography, and I have software to process star images. And it has yet another demosaicing algorithm that emphasizes detail over color accuracy and it would likely process the whiskers better than the original top image. But the color is going to be less accurate. Of course with a black and white cat, what can go wrong with color?


(Download)


(Download)

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Aug 9, 2020 14:29:38   #
Golden Rule Loc: Washington State
 
Thanks JimH for the explanation on the pixels.

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Aug 29, 2020 17:08:31   #
flyboy61 Loc: The Great American Desert
 
Golden Rule wrote:
I took this photo of my cat and cannot get rid of the strange fringe or is it moire on her whiskers on the camera right. I've tried using the moire and defringe sliders in LRCC but nothing removes the problem. Also, do you think her white bib is too gray or wrong temp. or tint? Thanks for tips on getting those darn whiskers to look normal!


Pretty kitty! In the small download, it looks as if if the whiskers are pixellated, but the really big one doesn't show it. Sharp and in focus. ??

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Dec 16, 2020 18:30:40   #
Dean Schepis
 
The picture is spectacular as is... I would strive to create such great composition and artistic results.
Dean

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Mar 5, 2021 12:15:52   #
geajr
 
Wow! that looks exactly like my cat Mitch. What settings did you use to get that shot?

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