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luminance problem

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  #1  
Old 12-16-2010, 04:56 AM
toni84 toni84 is offline
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Newbie luminance problem

Hi!
I'm wondering if there is a way to adjust the luminance for photoshop?
The problem is that when I look at the image when opened in photoshop, It's a lot brighter than when I look at the image in windows. This causes problems for me when I try to adjust brightness levels for shadow areas as It seems in photoshop that the detail in the shadow is good, but when I save and open in windows It is way too dark. Now I'm using the curves adjustment layer and I intentionally make It too bright so that It will be ok when saved.

For the record: I have tried different color settings, saving in tiff, jpeg.
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Old 12-16-2010, 05:47 AM
secretagents secretagents is offline
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Re: luminance problem

I guess you need to select another default colorspace in the program preferences, Adobe sRGB presumably.
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Old 12-16-2010, 08:33 AM
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mistermonday mistermonday is offline
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Re: luminance problem

toni84, your problem is likely related to Color Management. When you say you opened the image in Windows, which windows application was it? Picture View? Internet Explorer? Other?
Photoshop manages color whereas browsers typically do not. You likely processed your Photoshop image in one color space (like AdobeRGB) and opened it in a Window's application which is expecting something pretty close to sRGB.
The 1st thing I would try is to do Edit>Convert Profile and convert your image to sRGB, save it as a copy and try opening it in your Windows app.
Regards, Murray
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Old 12-16-2010, 09:15 AM
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andrewrodney andrewrodney is offline
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Re: luminance problem

Windows itself isn’t color managed. Photoshop is. All ICC aware (color managed) app’s will preview the same numbers identically so its the application at fault here and there isn’t much you can do. The values you see in Photoshop are correct, that’s key (well correct if the display is properly calibrated and the document has the correct embedded profile). Best to stick to sRGB for handling images in non color managed app’s but that doesn’t mean they will match what you see in Photoshop. But it will be closer than most other working spaces.
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Old 12-16-2010, 08:28 PM
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jcr6 jcr6 is offline
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Re: luminance problem

I know this is the wrong place to ask, but what is your perferred method of converting to B/W (grayscale) from color?

The old (1950's) YUV color television hack is regretfully still with us and I find it infuriating.

Would you care to comment or point me at something you've written?
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Old 12-16-2010, 08:48 PM
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mistermonday mistermonday is offline
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Re: luminance problem

Quote:
Originally Posted by jcr6 View Post
I know this is the wrong place to ask, but what is your perferred method of converting to B/W (grayscale) from color?

The old (1950's) YUV color television hack is regretfully still with us and I find it infuriating.

Would you care to comment or point me at something you've written?
Chris, was your question intended for Andrew or everyone?
Regards, Murray
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Old 12-16-2010, 09:19 PM
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jcr6 jcr6 is offline
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Re: luminance problem

Probably should be a new thread. Mostly Andrew, but it occurs to me that this should be a separate topic and I just hijacked this one.
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  #8  
Old 12-17-2010, 01:47 PM
toni84 toni84 is offline
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Re: luminance problem

Thanks for the tips, It was very useful information as I now know that windows picture view is the problem and not the image. The sRGB helped some I think, but I'll just keep my pictures as I see them in PS
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  #9  
Old 12-17-2010, 02:07 PM
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Re: luminance problem

Toni, it is also very important that you pay attention to your Color Management. If you are not familaiar with the process I would recommend that you open your color settings Edit>Color Settings and set your Color Management Policies to Preserve Embedded Profiles and check all of the Profile Mismatches boxes.
Regards, Murray
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  #10  
Old 12-18-2010, 05:08 PM
toni84 toni84 is offline
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Re: luminance problem

I will check this out, thank you!
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