created 2025-06-17, & modified, =this.modified
rel: Survey of Shadows Holes
Thought
Motivating thought, thinking of Rebecca Solnit on Darkness and Flying and the researching the amount of shadow/darkness present in refresh rates and voids between meaningful frames.
Looking at LCD screen extreme closeup you can see black bands around the discrete pixel geometry.
Coded Aperture
Coded apertures or coded-aperture masks are grids, gratings, or other patterns of materials opaque to various wavelengths of electromagnetic radiation.
A coded “shadow” is cast upon a plane by blocking radiation in a known pattern. The properties of the original radiation sources can then be mathematically reconstructed from this shadow. Coded apertures are used in X- and gamma ray imaging systems, because these high-energy rays cannot be focused with lenses or mirrors that work for visible light.
Thought
Ok – this reminds me of An Anthology of Chance Operations and Dieter Roth’s poetry machine, which was a punctured black sheet to be placed over other pages, revealing a chance poem.
Android Camera Sensor Image
As the camera’s sensor is photosensitive, when light photons are collected in the photosites (one photosite for each pixel), a tiny electrical charge is produced. Usually, the photodiodes employed in an image sensor are color-blind by nature, because they can only record shades of gray. To get color into the picture, as shown in Figure above, they are covered with a filter on top. This filter is usually a palette like red, green and blue (RGB) according to the pattern designated by the Bayer filter. The color image sensor uses the Bayer filter to output the RAW Bayer image.
Usually, the pattern of color filters is arranged in such a way where half of the total number of pixels are green (G), while a quarter of the total number is assigned to both red (R) and blue (B), the reason is a human eye is more sensitive to green color. When the image sensor is read line by line, the pixel sequence comes out as GRGRGR, etc., and then the alternate line sequence is BGBGBG, etc. as shown in the below diagram.
Screen-door Effect
The screen-door effect (SDE) is a visual artifact of displays, where the fine lines separating pixels (or subpixels) become visible in the displayed image. This effect can be seen in digital projector images and regular displays under magnification or at close range, but the increases in display resolutions have made this much less significant.
These subpixels work together to give the illusion of every color in a small square area, called a pixel. These pixels can’t be right next to each other; a small gap is needed between them to allow for manufacturing and wiring.
Pixel Pitch
Pixel pitch describes the density of the pixels (LED clusters) on an LED display and correlates with resolution. Sometimes referred to as pitch or dot pitch, the pixel pitch is the distance in millimeters from the center of a pixel to the center of the adjacent pixel. Since pixel pitch indicates the amount of space between two pixels, a smaller pixel pitch means there is less empty space between pixels. This equates to higher pixel density and improved screen resolution.
In OLED each pixel is individually in control of how bright it is, rather than a global illumination.