question on color space

L
Posted By
larrylook
Aug 24, 2005
Views
242
Replies
2
Status
Closed
If I shoot with D70 camera set on aRGB (mode 2) color space, open raw file with photoshop acr raw converter, and select in raw converter sRGB (where it says space in lower L corner), am I now working in sRGB color space, and is this going to result in same picture as if I shot the raw pic with camera set to sRGB (mode 1) originally and opened raw file selecting sRGB in PS?

Also once you make acr (raw converter) choices and click open – are you now working on a tiff file or still working on a raw file?

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B
birdman
Aug 25, 2005
If you change to sRGB you are now in the sRGB color space, which is slightly smaller than Adobe RGB.
Why would you do this as a general practice?
When you down convert from AdobeRGB you may lose image information that will not be restored if you upconvert back to AdobeRGB from sRGB. Pick a color space and stick with it, preferably AdobeRGB unless you clearly understand why a different color space would be preferable for your specific needs. If your camera has the ability to create and store images in AdobeRGB use that color space.
Have you considered whether you should work in 8 or 16 bit color in the raw converter and subsequently in Photoshop? If you understand this issue then you would understand the color space issue.
When you print you will print in your printer’s particular 8bit color space. The printer software drivers may or may not be able to accurately convert from your chosen color space and bit depth to their particular view of the color world. This is what color management is all about. When you open from the raw converter into Photoshop your image is not in any file format until you choose to save it in a particular format. If you open an adjustment layer and click "save" Photoshop will logically assume you want to save in the PSD format; if you have not opened an adjustment layer Photoshop will not make any such assumption.
If you do not already understand them you need to learn the difference between the various file formats as well as how to use non-destructive layers in Photoshop.
If you are asking these questions I assume you are new to these issues and may be overwhelmed by the complexity of Photoshop. Photoshop is not for beginners unless you have a solid grasp of photography, strong computer skills and a willingness to learn by trial and error. There are many video based demos, some free, on the web to jump start the basic concepts. Once you have a grasp on these issues you will understand why Photoshop offers so many options.
News groups can be a good place to pick up pearls or get contaminated by swine poop but you need to do alot of reading and review instructional video materials for the basics.
L
larrylook
Aug 25, 2005
I’m no expert, but not a total beginner. I am a beginner with PS though. The D70 surprised me when shootining in color mode 2 (aRGB) since purple flowers look blue in that mode. There’s a huge blue shift. So now I’m not sure if I should shoot in mode 1 (aRGB) -and also save step in converting to sRGB for the web. Someone explained this (but I’m not sure if it’s correct) by saying color modes in D70 are more than color space choices but also "looks" or "look preferences", but I was shocked by the shift.

My printer is a canon i9900 – and usually my main goal is printing. Iuse ilford classic pearl and downloaded ilford’s profile from their web site.

Thanks for your help.

"birdman" wrote in message
If you change to sRGB you are now in the sRGB color space, which is slightly smaller than Adobe RGB.
Why would you do this as a general practice?
When you down convert from AdobeRGB you may lose image information that will not be restored if you upconvert back to AdobeRGB from sRGB. Pick a color space and stick with it, preferably AdobeRGB unless you clearly understand why a different color space would be preferable for your specific needs.
If your camera has the ability to create and store images in AdobeRGB use that color space.
Have you considered whether you should work in 8 or 16 bit color in the raw converter and subsequently in Photoshop? If you understand this issue then you would understand the color space issue.
When you print you will print in your printer’s particular 8bit color space. The printer software drivers may or may not be able to accurately convert from your chosen color space and bit depth to their particular view of the color world. This is what color management is all about. When you open from the raw converter into Photoshop your image is not in any file format until you choose to save it in a particular format. If you open an adjustment layer and click "save" Photoshop will logically assume you want to save in the PSD format; if you have not opened an adjustment layer Photoshop will not make any such assumption.
If you do not already understand them you need to learn the difference between the various file formats as well as how to use non-destructive layers in Photoshop.
If you are asking these questions I assume you are new to these issues and may be overwhelmed by the complexity of Photoshop. Photoshop is not for beginners unless you have a solid grasp of photography, strong computer skills and a willingness to learn by trial and error. There are many video based demos, some free, on the web to jump start the basic concepts. Once you have a grasp on these issues you will understand why Photoshop offers so many options.
News groups can be a good place to pick up pearls or get contaminated by swine poop but you need to do alot of reading and review instructional video materials for the basics.

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