Auto Color vs Auto Contrast

W
Posted By
Wendi
Jun 27, 2003
Views
1984
Replies
3
Status
Closed
ElDee,

I summarized the key points of the online help in my original post. If you read my original post carefully, you’ll realize that it resembles the online help. I also asked a very specific questions regarding neutralize at the end of the message.

I post the question not because I couldn’t find the online help, but because I’m not sure if my interpretion of the online help is correct.

Anyways, as far as my interpretion goes… I think the key points are that Auto Color actually changes:
1. the near-white to more white
2. the near-black to more black
3. the near-gray to more gray
Whereas, Auto Contrast, does not change any hue, but the brightness only.

Does that sound right to you folks?

TIA
-wen

"ElDee" wrote in message
On Fri, 27 Jun 2003 11:57:08 -0400, "Wendi"
wrote:

What does Auto Color do? And how is it compared to Auto Contrast?
I understand that Auto Contrast makes highlights appear lighter and
shadows
apperar darker while preserving the overall color relationship. So, no color is changed. As for Auto Color, it clips the white and black pixels (that sounds the same as Auto Contrast). In addition to that, it neutralizes the midtones. What does neutralize mean? Making it more greyish?

Can someone shed some light on me please…

TIA
-wen

Found by clicking on "Help" on PS7:

The Auto Color command adjusts the contrast and color of an image by searching the actual image rather than the channels’ histograms for shadows, midtones, and highlights. It neutralizes the midtones and clips the white and black pixels based on the values set in the Auto Correction

The Auto Contrast command adjusts the overall contrast and mixture of colors in an RGB image automatically. Because it does not adjust channels individually, Auto Contrast does not introduce or remove color casts. It maps the lightest and darkest pixels in the image to white and black, which makes highlights appear lighter and shadows appear darker.

Regards,
Duane

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E
ElDee
Jun 27, 2003
On Fri, 27 Jun 2003 11:57:08 -0400, "Wendi"
wrote:

What does Auto Color do? And how is it compared to Auto Contrast?
I understand that Auto Contrast makes highlights appear lighter and shadows apperar darker while preserving the overall color relationship. So, no color is changed. As for Auto Color, it clips the white and black pixels (that sounds the same as Auto Contrast). In addition to that, it neutralizes the midtones. What does neutralize mean? Making it more greyish?

Can someone shed some light on me please…

TIA
-wen

Found by clicking on "Help" on PS7:

The Auto Color command adjusts the contrast and color of an image by searching the actual image rather than the channels’ histograms for shadows, midtones, and highlights. It neutralizes the midtones and clips the white and black pixels based on the values set in the Auto Correction

The Auto Contrast command adjusts the overall contrast and mixture of colors in an RGB image automatically. Because it does not adjust channels individually, Auto Contrast does not introduce or remove color casts. It maps the lightest and darkest pixels in the image to white and black, which makes highlights appear lighter and shadows appear darker.

Regards,
Duane
MD
Mike Davis
Jun 28, 2003
Auto Color is a combination of Auto Levels and Auto Contrast, although the results are somewhat different than applying each separately. Note that you can also adjust the Auto Color settings by going to the Auto Levels window and clicking on Options. Don’t ask me why Adobe put the Auto Color adjustments there, but they are.
N
nomail
Jun 28, 2003
Mike Davis wrote:

Auto Color is a combination of Auto Levels and Auto Contrast, although the results are somewhat different than applying each separately. Note that you can also adjust the Auto Color settings by going to the Auto Levels window and clicking on Options. Don’t ask me why Adobe put the Auto Color adjustments there, but they are.

I don’t agree that Auto Color is a combination of Auto Levels and Auto Contrast. Auto Color only tries to remove a color cast. Contrary to Auto Levels or Auto Contrast, it does NOT change the contrast of the image.


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