Re: How to "equalize" the brightness values of an image?


"Michael J." <michaelJ@xxxxxxxxxx> wrote in message
news:ubhr62hucn0bjih4fkkrklkurk4vt5fap6@xxxxxxxxxx
Greets all,

My question for the week would be how would you go about equalizing the
brightness
values of an image?

For example, assume you have a picture of a person wearing a tan suit, but
is wearing
dark shoes (like dark brown of black) and who also has very light hair
(like very
light blond or white).

I know that, in essence, what defines a picture is its contrast between
the lights
and darks. So I know there is a limit to how far you can go. I know I
could make a
selection on the shoes and the hair and try to lighten and darken them
respectively.
It might also be possible (in the case with a color image) to try and
"color match"
different regions of the image. (Also let's assume a case were the image
is B&W as
well).

I guess the question becomes, how can one get the brightness values of an
image
closer together so that it is more uniform, or at least as close as
possible? The end
product does not necessarily need to look "good" or accurate in a
photographic sense.
Thanks.

MJ

I like the curves adjustment myself (you can use an adjustment layer!) and
use the little eyedroppers to sample the light and dark spots of your image
(the grey spot is more difficult to gauge - I usually do the light/dark
adjustment first, close and then reopen to fiddle with the grey!! (does
anyone know a better way for this operation?)


.

Relevant Pages

  • Re: Macbook display on external monitor
    ... I don't mean just turn the brightness down, as the display ... but just dark (you can see the picture). ...
    (uk.comp.sys.mac)
  • Re: Brightness weirdness on Philips 20PT1553-00
    ... brightness of the picture after it turned bright. ... 2/3 the picture turns dark. ... > Probably something in the bias circuitry to the CRT or in the video ...
    (sci.electronics.repair)
  • Re: JVC D-ILA lamp replaced
    ... but boy do I notice a lot better brightness in the picture. ... I wonder how dark ... After 2000 hours I'm still running with my brightness set ...
    (alt.tv.tech.hdtv)
  • Re: TV glitch mars Xbox 360 Kong game (off-topic)
    ... as all mine have cunningly had an adjustable "brightness" setting. ... That way if a picture is "dark" I can make it "brighter", ...
    (uk.games.video.misc)
  • Re: night sky meter project needs SX programmer
    ... >>The detector has a dark frequency temperature coefficient and so the ... noise, dark offset, and dark frequency temperature coefficient. ... > driving the display, includes nonvolatile memory which the chip itself ... > display would show, instead of the mag/sq arc sec sky brightness, ...
    (sci.astro.amateur)