What is Chromatic Aberration?
Chromatic aberration is a distortion in photography that creates a "color fringe" effect, typically red, orange or magenta and blue, violet or purple colors. It seems photographers don't like this very much. It's associated with cameras of poor quality. However, there are also cases of graphical artists deliberately adding this distortion to photography, illustration, and video to create a "glitchy" effect.
Chromatic aberration occurs due to different colors (wavelengths of light) being refracted differently by the glass lens of the camera. It's specially obvious with white objects or bright skies. Essentially, it's as if the camera sees different colors from different distances, and since things at different distances will be projected at different positions in a bidimensional plane, the colors appear to "shift" on the photo.
[...] colour distortion in an image viewed through a glass lens. Because the refractive index of glass varies with wavelength, every property of a lens that depends on its refractive index also varies with wavelength, including the focal length, the image distance, and the image magnification. The change of image distance with wavelength is known as chromatic aberration [...]
https://www.britannica.com/technology/chromatic-aberration (accessed 2024-07-13)
In Krita and GIMP, this effect can be created through G'MIC.
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