Get better color accuracy in every photo using this little device.
The trick to accurate color capture is to always have and use a color reference each time you start shooting in different lighting... but carrying a color reference card big enough to focus on
is a pain. As I disclosed back in 2003 (more information at http://aggregate.org/DIT/LENSCAP/
), the color reference need not be in focus
to work -- so you can use a tiny, easy-to-carry, reference. For example, got lenscap?
It should be noted that technically accurate color imaging is very difficult. Photons can have any of a wide range of wavelengths, but most sensors just measure approximately how many photons hit each pixel after passing through the corresponding Red, Green, or Blue filter. Further, human vision employs a mechanism of color consistency which makes the relationship between spectral properties and apparent color quite complex. In short, some very nonlinear things can happen in these transformations, the discussion of which is well beyond this Instructable.
You also should keep in mind that color accuracy doesn't necessarily make good art. People like sunsets, and many other things, in less accurate but more intense "Kodachrome" colors.