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I am using a 5D MkII. In the menu I have set the Profile to sRGB. I shoot everything in RAW. I use CS4 and all updates have been installed.
If I copy my RAW files into a folder and then select an image in that folder, Bridge tells me that the bit depth is 16 bit, the colour mode is RGB and the profile is untagged. If I then open the image using ACR and go into Image>Mode I find that the image is now 8 bit. And if I go into Edit>Convert To Profile it says that the Source Space is Adobe RGB.
Why not 16 bit?
Why not sRGB?
I cannot find any means of changing these features. Can anybody offer an explanation, please?
Also I like to work at 300 ppi but when I open an image and go into Image>Image Size I am presented with pixel dimensions and an image size based on 240 ppi. Again I can find no way of telling CS4 to always work on 300 ppi. Is it possible? (NB if I create a new document, CS4 makes it 300 ppi, which is how I set preferences, so it does appear to "know" I work at 300 ppi)
Your advice will be much appreciated
John
Quote: Also I like to work at 300 ppi but when I open an image and go into Image>Image Size I am presented with pixel dimensions and an image size based on 240 ppi. Again I can find no way of telling CS4 to always work on 300 ppi. Is it possible? (NB if I create a new document, CS4 makes it 300 ppi, which is how I set preferences, so it does appear to "know" I work at 300 ppi)
It doesn't exist until you print.
If you are using photoshop with a known dot-ptich monitor to show "projected size" then you are doing it wrong. - photoshop doesn't treat the ppi value this way, its more of a conversion factor than a display variable.
This is why my monitor shows a 1 inch x 1 inch @ 300 ppi to be the "actual" size of 9cm.
If you want an image to be the "actual size" of the print on your screen, then you set photoshops PPI value to the dot pitch PPI capability of your screen. In my case: 0.311 dot ptich and 81.59 actual PPI value.
So a 1 inch by 1 inch @ 81.59 PPI displays at exactly 1 inch in size.
- however if i moved that file to my WQUXGA monitor which can display 203.2 PPI - it would be all wrong...
-that is why doing it that way is silly as everyone has variable resolution monitors. So its best to remember that PPI/DPI doesn't exist until you print. Digital data has no physical "length" measurement, and it displays at a resolution not a size.
Quote: Why are you shooting in sRGB?
Adobe RGB is irrelevant for real photography. sRGB gives better (more consistent) results and the same, or brighter, colors.
Using Adobe RGB is one of the leading causes of colors not matching between monitor and print.
sRGB vs. Adobe RGB
rgb is very relevant if you want to print. i set my camera to rgb process that way and change profile to srgb for web use when its reduced to 72dpi. rgb is a larger colour space cabable of a wider colour gammut than srgb which is intended for projection and web use.
likewise 240dpi is the optimum for printing.
Phil
johnp, in Adobe Camer RAW click on the line of blue text below the image display area. That text tells you the conversion settings. If you click on it you can change them. I suspect that they are set to 8 bit, 240ppi, and Adobe RGB colourspace.
Quote: Why are you shooting in sRGB?
Adobe RGB is irrelevant for real photography. sRGB gives better (more consistent) results and the same, or brighter, colors.
Using Adobe RGB is one of the leading causes of colors not matching between monitor and print.
sRGB vs. Adobe RGB
Ken Rockwell is talking absolute rubbish there.
Quote:
Ken Rockwell is talking absolute rubbish there.
Does he ever talk sense?
Ken Rockwell lives in the 19th century along with anyone who think the web displays at 72dpi and doesn't have ICC control.
It utterly shocks me when people report that the picture on a monitor / web is 72dpi and only sRGB can be used...
LOL....Someone actually reads & quotes Ken Rockwell, Therefore it must be right....
Just goes to show that Mr Rockwell does not read any of his many Nikon manuals, Where they explain the reason WHY there is
an option to shoot in sRGB or Adobe RGB, Along with some notes on why you might use one in preferance to the other.
Basics = sRGB for images that will go straight to print, With very little post processing.
Adobe RGB for images that may be subject to extensive post processing ( Note the word " May " )
Of course if it makes more sense to you, To shoot in a " Smaller " colour space, Stick with sRGB, Heck! Its a free world.
If you want to know all there is to know about sRGB & Adobe RGB, Plus some colour management ( its not that hard really )
Otherwise the answer to the OPs question has been answered......Sort off.....
With monitors now able to display 100% of the Adobe RGB colour space and printers constantly expanding the colours they're are able to reproduce, why cripple the quality of your images by shooting in sRGB. You can convert an Adobe RGB image to sRGB with the click of a mouse, but you gain nothing by converting sRGB to Adobe RGB.
most places I read and even a lecture I attended recently by a professional photoshop artist recommended using sgrb so must admit I am a little confused here, the ken rockwell link was just one i grabbed very quickly and there are many more out there saying the same. so must admit I am now wondering which is the best way to go, is there any articles fighting the case of using adobe over Sgrb
Quote: Most places I read and even a lecture I attended recently by a professional photoshop artist recommended using sgrb so must admit I am a little confused here, the ken rockwell link was just one i grabbed very quickly and there are many more out there saying the same. so must admit I am now wondering which is the best way to go, is there any articles fighting the case of using adobe over Sgrb
If you think the web is 72dpi then do not touch aRGB.
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