Gamma dilemma

PE
Posted By
phoney.email
Apr 18, 2004
Views
237
Replies
3
Status
Closed
Converting from gamma 1.00 to 2.20 causes serious histogram artifacts. This is manifested by recursive and overlapping "waves" with major gaps in the lower (dark) part of the histogram as can be seen here:

http://members.aol.com/tempdon100164833/nikon/Blue.jpg
http://members.aol.com/tempdon100164833/nikon/Green.jpg
http://members.aol.com/tempdon100164833/nikon/Red.jpg

Editing an image with such major histogram distortion is quite difficult if not impossible.

Question: Is there any way to do a gamma conversion and still end up with a smooth and uniform histogram?

Don.
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gamma

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HL
Harvey L
Apr 18, 2004
can you get better results by adjusting the histogram only, with no gamma correction. If this is a consistent thing then you may want to increase the gamma through your video card software, which has no effect to your histogram

"Don" wrote in message
Converting from gamma 1.00 to 2.20 causes serious histogram artifacts. This is manifested by recursive and overlapping "waves" with major gaps in the lower (dark) part of the histogram as can be seen here:
http://members.aol.com/tempdon100164833/nikon/Blue.jpg
http://members.aol.com/tempdon100164833/nikon/Green.jpg
http://members.aol.com/tempdon100164833/nikon/Red.jpg

Editing an image with such major histogram distortion is quite difficult if not impossible.

Question: Is there any way to do a gamma conversion and still end up with a smooth and uniform histogram?

Don.
PE
phoney.email
Apr 19, 2004
I’m not sure I understand. Can you please explain what you mean by adjusting the histogram only.

This is a consistent thing because of the way gamma conversion works. I could change my monitor gamma to 1.00 but that only postpones the problem because in the end it will have to converted. However, that may be the lesser evil because at least I would do the editing with a decent histogram.

Don.

On Sun, 18 Apr 2004 14:55:36 GMT, "Harvey L"
wrote:

can you get better results by adjusting the histogram only, with no gamma correction. If this is a consistent thing then you may want to increase the gamma through your video card software, which has no effect to your histogram

"Don" wrote in message
Converting from gamma 1.00 to 2.20 causes serious histogram artifacts. This is manifested by recursive and overlapping "waves" with major gaps in the lower (dark) part of the histogram as can be seen here:
http://members.aol.com/tempdon100164833/nikon/Blue.jpg
http://members.aol.com/tempdon100164833/nikon/Green.jpg
http://members.aol.com/tempdon100164833/nikon/Red.jpg

Editing an image with such major histogram distortion is quite difficult if not impossible.

Question: Is there any way to do a gamma conversion and still end up with a smooth and uniform histogram?

Don.

MR
Mike Russell
Apr 25, 2004
Don wrote:
Converting from gamma 1.00 to 2.20 causes serious histogram artifacts. This is manifested by recursive and overlapping "waves" with major gaps in the lower (dark) part of the histogram as can be seen here:
http://members.aol.com/tempdon100164833/nikon/Blue.jpg
http://members.aol.com/tempdon100164833/nikon/Green.jpg
http://members.aol.com/tempdon100164833/nikon/Red.jpg

Editing an image with such major histogram distortion is quite difficult if not impossible.

Question: Is there any way to do a gamma conversion and still end up with a smooth and uniform histogram?

Don,

Convert to 16 bits per channel, do the gamma conversion, and then convert back to 8 bits.
—

Mike Russell
www.geigy.2y.net

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