19
votes
Accepted
Solve unwanted white "waves" and "Pacman squares" in low-light picture - post using Google Photos
This is known as "banding". Dark parts in the picture have a small range of values (in a JPG, you only have 256 values per color), when you lighten them, you increase the gap between consecutive ...
- 20.6k
19
votes
Removing "banding" lines caused from using silent shutter
I don't use Photoshop, so here it is done with Gimp, but I assume the same tools are available on PS:
Use Wavelet decompose to decompose the image into its frequency components (these are images that ...
- 20.6k
17
votes
How can I avoid circular banding artifacts in clear skies when de-noising?
I actually wouldn't describe what you're seeing as a halo artifact. It seems to me to be posterization — there just aren't enough tones to smoothly represent the gradient of the sky. It just happens ...
- 143k
13
votes
Removing "banding" lines caused from using silent shutter
This "banding" is caused by the primary light source in the image varying in intensity over time, and by the (electronic) rolling shutter in the camera converting this variation over time ...
- 4,703
5
votes
LED lighting problem: Bands of uneven exposure on images taken under LED lighting with silent shutter (full electronic shutter)?
Way back in 2014 Canon introduced a feature with the 7D Mark II that they called flicker reduction. Basically, the camera uses the light meter to detect the timing of flickering lights and then times ...
- 175k
5
votes
Accepted
What is the name of the problem where lines appear in a photo where there should just be a smooth gradient?
Probably the word you search is "banding". You can get more information here.
Quoting:
Colour banding is a problem of inaccurate colour presentation in
computer graphics. In 24-bit color modes, ...
- 11.5k
5
votes
How can I avoid circular banding artifacts in clear skies when de-noising?
I think what you're seeing is called banding or posterization. This is where smooth, continuous tones are rendered in a stepwise manner because the bit depth (the number of bits used to represent each ...
- 2,341
5
votes
Solve unwanted white "waves" and "Pacman squares" in low-light picture - post using Google Photos
This is named banding. And it's caused in your case by overprocessing the image. What you can do is to take the photo in RAW and postprocess it. When postprocessing mask the sky and do not increase ...
- 11.5k
4
votes
Does higher resolution in an image imply more bits per pixel?
A pixel can be understood as a 3-dimensional thing.
A pixel holds information. How "deep" this information can be is the trick.
Pixel Depth
Here is a representation of one pixel. On the left,...
- 23.8k
4
votes
Accepted
Does higher resolution in an image imply more bits per pixel?
Image resolution (amount of pixels) and bit depth (bits per pixel) can be changed independently. Any combination of high/low resolution and more/less bits per pixel is possible.
Sometimes, however, ...
- 5,045
4
votes
Accepted
Will there be (stronger) colour banding on 8bit wide gamut display when working in sRGB?
This is a valid concern.
My understanding of your question is that it's a monitoring problem rather than editing problem. That is, when you are editing an sRGB photo, you specify that your current ...
- 1,539
3
votes
Accepted
Why are there subtle off-color arcs in my photos?
This is known as "banding". This happens when you have uniform color gradients and the quantization by the camera (because JPEG is only 8bits/channel) transforms them into uniform areas. Along the ...
- 20.6k
3
votes
What causes this leather-grain pattern of noise in the sky when I inspect with a sharp mask?
Even when the sky appears uniform to our eyes, it isn't. The index of refraction of air is affected by a number of things (e.g. the shimmering mirages you see over a hot road) - temperature, humidity, ...
- 5,128
3
votes
How can I avoid circular banding artifacts in clear skies when de-noising?
The effective trick for this is to double the resolution of the photo, add a very small amount of stochastic hue-constrained noise, bring the resolution back to original, and THEN de-noise.
There is ...
- 131
3
votes
Best way to photograph a LED wall (that has people in front of it)
You have diferent issues here. Lets separate them.
1) You have a bright wall and dark people... It is the same case as if you have a bright window with people on an interior. Your options are limited....
- 23.8k
3
votes
Removing "banding" lines caused from using silent shutter
Banding is very difficult to remove. If you are lucky, the band itself has no falloff of light in itself. Which it seems is not the case here.
However, what you could try, is to basically equalize the ...
- 4,099
2
votes
Best way to photograph a LED wall (that has people in front of it)
Your ways are:
using any film to record images instead of digital technology
using the camera with strong enough AA filter
using the camera with surplus of resolution (medium format cameras, may be ...
- 4,770
2
votes
How can I avoid circular banding artifacts in clear skies when de-noising?
I have made a circular 8 bit gradient with sampled edge colour and center colour. This illustrates that it clearly is not the 8bit quantisation problem.
I have also took a stare at the source, non-...
- 4,770
2
votes
Does higher resolution in an image imply more bits per pixel?
Not in common digital imaging terminology. Instead, we call bits-per-pixel bit depth.
Once unpacked from whatever compression format they were stored in, digital images are usually represented as ...
- 143k
2
votes
How can I prevent banding in images I'm posting on the Internet?
Banding and blotchiness in images is often caused by excessive post processing. There are a few ways to avoid causing such effects:
Capture in RAW and post process with high bit-depth color. Make ...
- 26.9k
2
votes
What is causing this pattern of horizontal and vertical lines in my pictures?
You note that the pictures are CR2 images. These are Canon RAW files — they are not, in that state, usable for sharing and printing and so on. You need software to convert them. The most popular such ...
- 143k
2
votes
LED lighting problem: Bands of uneven exposure on images taken under LED lighting with silent shutter (full electronic shutter)?
The problem is, that the camera does not do a full sensor readout in one go (or global shutter), but reads the sensor linewise.
LED light is often pulsing to dim the light. So when you see a LED that ...
- 4,099
2
votes
Will there be (stronger) colour banding on 8bit wide gamut display when working in sRGB?
The actual problem occurs due to the accuracy of the math (editing bit depth) and not the color space itself. I.e. you can edit in sRGB with 16 or 32 bit accuracy in photoshop and (largely) avoid the ...
- 14.7k
2
votes
What causes bright banding in CMOS sensor?
That is a readout issue that can occur with CMOS sensors.
It is essentially the same thing as CCD "smear;" only in a horizontal direction rather than vertical, and CCD sensors are much more ...
- 14.7k
2
votes
Major color banding on some photos - Pentax k1 mark ii
Based on the photo you have a problem with SD card (storage or reading/writing process). As you can see these errors have more or less random nature so it is not something related to the sensor. You ...
- 11.5k
1
vote
What causes bright banding in CMOS sensor?
This is caused by saturation of the sensor. If the pixel well is overloaded, electrons leak in to neighboring pixels which causes the streak. A nice article that has a more in depth explanation.
- 2,831
1
vote
What causes this leather-grain pattern of noise in the sky when I inspect with a sharp mask?
In my opinion this can be some normal background noise generated by the sensor, amplified by Your post-processing. I found a similar pattern at high magnification on pictures taken with Olympus E-510 ...
- 31
1
vote
Accepted
Why am I getting horizontal stripes/bands on sensor?
These are dark images (cap on). With severe stripes it can be very noticeable on uniform lighting and sharp contrast transitions as well but it is most prominent in low light scenarios.
The increase ...
- 175k
1
vote
Solve unwanted white "waves" and "Pacman squares" in low-light picture - post using Google Photos
Even if you processed the raw files initially, when you upload them to sites such as google photos, they may compress them further to reduce the bandwidth needed to transmit them to viewers. This ...
- 175k
1
vote
How do I save this 'band-less' version of this image from ACR?
Banding is due to quantization. If you have a very slow and regular color gradient, and not many available values dues to low bit-depth (8-bit channel), at some point along the gradient adjacent ...
- 20.6k
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