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

 
 
Michael J.
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      05-19-2006, 01:31 PM
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
 
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Janee
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      05-19-2006, 02:40 PM
Hey there, MJ!
There are always at least three ways to do anything in Photoshop.

One choice for you would be to duplicate your photo layer and then apply
Image > Adjustments > Equalize. You can then adjust the opacity of the
equalized layer till you like the result.

Also try Image > Adjustments > Shadow/Highlight.

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Janee, ACE, ACI
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Online Photoshop classes -- http://www.myJanee.com/classes.htm
Remove 7 8 7 to reply


 
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Rudy Benner
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      05-19-2006, 03:06 PM

"Janee" <(E-Mail Removed)> wrote in message
news:rJKdnXcDTa5iRfDZRVn-(E-Mail Removed)...
> Hey there, MJ!
> There are always at least three ways to do anything in Photoshop.
>
> One choice for you would be to duplicate your photo layer and then apply
> Image > Adjustments > Equalize. You can then adjust the opacity of the
> equalized layer till you like the result.
>
> Also try Image > Adjustments > Shadow/Highlight.
>
> --
> Always me,
> Janee, ACE, ACI
> --
> No one else has your vision. No one else can do your art.
> --
> Photoshop Tutorials, Art Challenge, and more! http://www.myJanee.com
> Online Photoshop classes -- http://www.myJanee.com/classes.htm
> Remove 7 8 7 to reply
>
>


Excellent tip. Maybe I should read the documentation. Nah, guys don't read
documentation.


 
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Harry Limey
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      05-19-2006, 03:55 PM

"Michael J." <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> 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?)


 
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Mike Russell
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      05-19-2006, 04:27 PM
"Janee" <(E-Mail Removed)> wrote in message
news:rJKdnXcDTa5iRfDZRVn-(E-Mail Removed)...

Janee! Good to see you again.
--
Mike Russell
www.curvemeister.com/forum/


 
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Michael J.
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      05-19-2006, 06:59 PM
Hi Janee and thanks for the info! Just curious, are you the one on the photoshop
videos from Total Training (along with the likes of Deke McClelland and all?) Maybe
I'm way off but just wondering.

MJ

On Fri, 19 May 2006 10:40:56 -0400, "Janee" <(E-Mail Removed)> wrote:

>Hey there, MJ!
>There are always at least three ways to do anything in Photoshop.
>
>One choice for you would be to duplicate your photo layer and then apply
>Image > Adjustments > Equalize. You can then adjust the opacity of the
>equalized layer till you like the result.
>
>Also try Image > Adjustments > Shadow/Highlight.
>
>--
>Always me,
>Janee, ACE, ACI
>--
>No one else has your vision. No one else can do your art.


 
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Dave
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      05-19-2006, 07:35 PM
On Fri, 19 May 2006 14:59:54 -0400, Michael J. <(E-Mail Removed)>
wrote:

>Hi Janee and thanks for the info! Just curious, are you the one on the photoshop
>videos from Total Training (along with the likes of Deke McClelland and all?) Maybe
>I'm way off but just wondering.
>
>MJ



Quite difficult to believe that you find it to much effort
to read the footing under her letter.

Dave

 
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tacit
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      05-19-2006, 11:17 PM
In article <(E-Mail Removed)>,
Michael J. <(E-Mail Removed)> wrote:

> 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.


Image->Adjust->Curves.

Increasing the steepness of the curve increases contrast. Decreasing the
slope of the curve decreases contrast.

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all at http://www.xeromag.com/franklin.html
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Michael J.
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      05-20-2006, 01:51 PM
Hi Dave, I did read the footing under the letter, which was what prompted me to asked
the question. It was just a matter of curiosity. I hope that hasen't been outlawed.

On Fri, 19 May 2006 21:35:23 +0200, Dave <(E-Mail Removed)> wrote:

>Quite difficult to believe that you find it to much effort
>to read the footing under her letter.


 
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Rudy Benner
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      05-20-2006, 02:14 PM

"Michael J." <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi Dave, I did read the footing under the letter, which was what prompted
> me to asked
> the question. It was just a matter of curiosity. I hope that hasen't been
> outlawed.
>
> On Fri, 19 May 2006 21:35:23 +0200, Dave <(E-Mail Removed)> wrote:
>
>>Quite difficult to believe that you find it to much effort
>>to read the footing under her letter.

>


Curiousity is VERBOTEN on this NG.


 
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