Gamma correction

RD
Posted By
Robert de Ridder
Feb 19, 2006
Views
244
Replies
7
Status
Closed
Hi All,

I can’t seem to find the option for Gamma correction. According to the help it should be under image>adjustments, but it isn’t. Is this a known problem?

Robert
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RB
Rudy Benner
Feb 19, 2006
"Robert de Ridder" wrote in message
Hi All,

I can’t seem to find the option for Gamma correction. According to the help it should be under image>adjustments, but it isn’t. Is this a known problem?

Robert

Image>Adjustments>Levels ?
N
nomail
Feb 19, 2006
Robert de Ridder wrote:

I can’t seem to find the option for Gamma correction. According to the help it should be under image>adjustments, but it isn’t. Is this a known problem?

Image – Adjustments – Exposure

It’s a new function in Photoshop CS2, and mainly meant for HDR images.

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.nl
R
Ragnar
Feb 19, 2006
"Robert de Ridder" wrote in message
Hi All,

I can’t seem to find the option for Gamma correction. According to the help it should be under image>adjustments, but it isn’t. Is this a known problem?

Robert

Good answers from Rudy and Johan, but if you mean Screen Gamma, it’s in Control Panel not PS.

John
RD
Robert de Ridder
Feb 19, 2006
"John Rampling" schreef in bericht
"Robert de Ridder" wrote in message
Hi All,

I can’t seem to find the option for Gamma correction. According to the help it should be under image>adjustments, but it isn’t. Is this a known problem?

Robert

Good answers from Rudy and Johan, but if you mean Screen Gamma, it’s in Control Panel not PS.

John

Well just about every other photo adjustment program has a gamma function. Most of the time if a picture is too light or to dark gamma is the best and easiest way to correct it. Of course levels can do almost the same thing, but it’s a lot more cumbersome.
It’s strange though it’s mentioned in the help screen, yet it isn’t in the program.

Robert
N
nomail
Feb 19, 2006
Robert de Ridder wrote:

Well just about every other photo adjustment program has a gamma function. Most of the time if a picture is too light or to dark gamma is the best and easiest way to correct it. Of course levels can do almost the same thing, but it’s a lot more cumbersome.
It’s strange though it’s mentioned in the help screen, yet it isn’t in the program.

Aren’t you mistaken with ImageReady? In the Photoshop Help, under ‘Adjust the image gamma’, you do indeed see a remarkt to go to ‘Image – Adjustments’, but it only mentions ImageReady, not Photoshop. It reads: "In ImageReady, use this simple adjustment to change the image gamma. In Photoshop, preview the image gamma you want to match, and then use the Levels command to make the image lighter or darker."

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.nl
MR
Mike Russell
Feb 19, 2006
"Robert de Ridder" wrote in message
….
[re gamma correction in Photoshop]

Well just about every other photo adjustment program has a gamma function. Most of the time if a picture is too light or to dark gamma is the best and easiest way to correct it. Of course levels can do almost the same thing, but it’s a lot more cumbersome.
It’s strange though it’s mentioned in the help screen, yet it isn’t in the program.

The middle gray triangle in Levels is called the Gamma adjustment, but it’s not an exponential function. Curves also gives a close approximation to a gamma correction.

It’s possible to use what is called a false profile to apply a very large gamma correction to an image. This is an advanced technique to rescue underexposed images, and is based on creating very high gamma spaces in the Color Settings dialog, then assigning them to an underexposed image. Generally you would also use the primaries from Adobe RGB or even ProPhoto RGB to increase the color saturation, as well as the brightness. —

Mike Russell
www.curvemeister.com
U
usenet
Feb 20, 2006
Robert de Ridder wrote:

Hi All,

I can’t seem to find the option for Gamma correction. According to the help it should be under image>adjustments, but it isn’t. Is this a known problem?

Do you mean that your image file is corrected to one gamma ratio but is being displayed in another, or do you mean you want to make it lighter or darker or more contrasty or whatever?

If it’s the latter, I suggest converting to Photoshop LAB mode and tweaking the L channel in Curves.

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