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Re: gamma correction [message #31249 is a reply to message #31248]

Wed, 26 June 2002 11:27

Med Bennett
Messages: 109
Registered: April 1997

Senior Member

David Fanning wrote:

> carine castillon (carine.castillon@noveltis.fr) writes:
>
>> I have a question about gamma correction.
>>
>> I'm displaying jpeg image, and I want to apply a gamma correction to this
>> image.
>> I don't know how to do. I'm trying gamma_ct procedure but there is no
>> effect.
>
> Probably you are not seeing any effect because your JPEG
> image is a 24-bit image. I'm not sure what it would mean
> to "gamma correct" a 24-bit image. Perhaps you can convert
> the RGB image to a HSV image and gamma correct the Hue
> portion.
>
> I guess I would need more details to suggest other techniques.
>
> Cheers,
>
> David
> --
> David W. Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Phone: 970-221-0438, E-mail: david@dfanning.com
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Toll-Free IDL Book Orders: 1-888-461-0155

Hmmm... my Irfanview software happily gamma corrects 24-bit JPEGs - I do it all
the time. Why shouldn't IDL be able to do it?

--
----
Real email address is mbennett at indra dot com
ICBM Coordinates: 40.02N, 105.29W, 1670 m

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[Message index]

		Re: gamma correction By: David Fanning on Fri, 28 June 2002 07:29
		Re: gamma correction By: Craig Markwardt on Fri, 28 June 2002 06:33
		Re: gamma correction By: Dick Jackson on Thu, 27 June 2002 21:42
		Re: gamma correction By: Med Bennett on Thu, 27 June 2002 20:53
		Re: gamma correction By: David Fanning on Thu, 27 June 2002 16:57
		Re: gamma correction By: Dick Jackson on Thu, 27 June 2002 16:14
		Re: gamma correction By: David Fanning on Thu, 27 June 2002 13:23
		Re: gamma correction By: btupper on Thu, 27 June 2002 12:34
		Re: gamma correction By: Rick Towler on Thu, 27 June 2002 11:06
		Re: gamma correction By: David Fanning on Wed, 26 June 2002 15:22
		Re: gamma correction By: David Fanning on Wed, 26 June 2002 15:20
		Re: gamma correction By: Dick Jackson on Wed, 26 June 2002 14:17
		Re: gamma correction By: David Fanning on Wed, 26 June 2002 12:11
		Re: gamma correction By: Med Bennett on Wed, 26 June 2002 11:27
		Re: gamma correction By: David Fanning on Wed, 26 June 2002 07:44
		Re: gamma correction By: Craig Markwardt on Fri, 28 June 2002 14:01

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