Color theory readings
What resources can be found online and in libraries to help understand some color theory ?
What resources can be found online and in libraries to help understand some color theory ?
This page addresses most of the mistakes and misconceptions about Ansel that can be found online.
Ten artykuł dokumentuje matematykę aktualnie zaimplementowaną w module diffuse or sharpen Ansela, w postaci, w jakiej występuje w plikach src/iop/diffuse.c, src/common/bspline.h, data/kernels/diffuse.cl oraz data/kernels/bspline.cl. Nie jest to poradnik użytkowania. To rekonstrukcja modelu numerycznego na podstawie kodu źródłowego, w której twierdzenia naukowe zostały prześledzone aż do odwołań cytowanych w komentarzach kodu.1
This article presents the mathematics of Ansel’s highlight reconstruction : the original 2021
guided laplacians design, whose general ideas had only ever been sketched on the pixls.us
forum,1 and harmonic transposition, the method that replaced it after a ground-truth
study exposed a magnitude-recovery bug.2 It is organized so each reader finds their
section : the results and each method’s Intuition & background need no
mathematics ; developers will find the Implementation & optimizations subsections and the
performance study ; the
theoretical findings and the
graveyard annex are written to be
reusable outside photography ; and
how this work was actually done documents the man–machine
research protocol behind it.
Linux wciąż ogromnie pozostaje w tyle za MacOS-em, a nawet za Windowsem, jeśli chodzi o zapewnienie spójności kolorów wyświetlanych na monitorze. Powszechnie wymuszane przyjęcie serwera graficznego Wayland w większości dystrybucji Linuksa jeszcze bardziej pogorszyło ten stan, ponieważ zarządzanie kolorami było przez długi czas odrzucane przez twórców Waylanda. Specyfikacja CMS w Waylandzie została ostatecznie naszkicowana w 2020 roku, a kod scalono z główną gałęzią Waylanda w 2025 roku, przez zewnętrznych współtwórców, po długiej walce twórców wcześniejszego oprogramowania CMS z historycznymi twórcami Waylanda.1 Od tego czasu stan obsługi CMS jest bardzo niejednoznaczny w różnych środowiskach graficznych i dystrybucjach. A mimo to wstępne wyniki telemetrii Ansela pokazują 67 % przyjęcia Waylanda wśród użytkowników Ansela.
This page lists all the known cameras and whether or not their raw files are decoded by Ansel, as well as all file types supported in input and output.
Some cameras may use different encoding formats (12 bits, 14 bits, sRAW, compressed or not) and image ratios (4:3, 16:9, 3:2). Because one or more of these formats is supported doesn’t imply they all are. Different cameras may share the same sensor and electronics, even though their commercial name is different: those will be found in the aliases columns.
We all know what “white” is. We can picture a white sheet of paper. We know it is white because we learned it. But if you put your paper sheet under a summer sun, or a cloudy sky, or at home with those warm living-room bulbs, that white will change color. It might disturb you for the first few seconds, then you will just forget about it: your brain will adapt. But adapt (to) what ?
This will apply to upstream Darktable as to Ansel since they share most of their color pipeline. The following procedure will help you troubleshoot your color issues, whether it is inconsistent appearance between export vs. preview, or between screen vs. print, or between 2 apps.
The inherent problem of color is it exists only as a perception, and that perception is highly contextual and fluid. If I take any color patch and display it over a white, middle-grey or black background, it will not appear the same even though a colorimeter would confirm it’s the exact same color. I have built a little web animation to showcase this effect, displaying sRGB gamut slices at constant hue, over user-defined background lightness : the sRGB book of color .
mindmap
root((COLOR))
color appearance model
uniform color space
chromaticity
U, V
a, b
lightness
L
delta E
chromatic adaptation transform
illuminant
color reproduction index
color temperature
surround lighting
background lightness
dimensions
Munsell
hue
chroma
value
natural color system
blackness
saturation
hue
CIE
lightness
brightness
saturation
chroma
colorfulness
hue
measure
colorimetry
tristimulus
sensor
Luther-Ives criterion
metamerism
dynamic range
noise
mosaicing
Bayer
XTrans
zipper artifacts
spaces
rgb(RGB)
HSV
HSL
LMS
Yrg
XYZ
Yxy
Yuv
Ych
CYM
CYMK
primaries
cone cells
LED
ITU BT.Rec 709
ITU BT.Rec 2020
DCI P3
inks
spectrometry
light spectrum
wavelengths
energy
photometry
luminance
correction
profile
matrix
lookup table
transfert function
color grading
ASC CDL
channel mixer
curves
white balance
You can also ask Chantal, the AI search engine.
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