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DPChallenge Forums >> Tips, Tricks, and Q&A >> Adobe RGB?
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02/21/2004 01:19:50 PM · #1
I saw some discussion about this a couple of months ago. Whats best for DPC entries? What is Adobe RGB and the other formats, and which one is best. This is almost as hard as picking the correct film for the job.
02/21/2004 02:12:49 PM · #2
Adobe RGB is a good working space, assuming your monitor is calibrated (even approximately) to a white point of about 6500K (and gamma 2.2); if you're on a PC, it's probably close enough. A working space is one in which you do your editing, but is not (necessarily) intended for output devices (such as monitors/web, printers, etc.). It's a wider color space and is best suited for editing in 16-bit mode (i.e. better than 8-bit input).

There are some special cases where you would make your working space the same as the output device's space, but it's not applicable here.

Assuming you are using a RAW converter, you can specify that the output be 16-bit and in Adobe RGB space. You can do your editing in 16b/adobeRGB, but make sure you convert to 8b/sRGB before you throw it up on DPC. The "Save for Web..." option in photoshop does this conversion too I think, but I can't recall off-hand.

If you're on a mac or calibrate your monitor to a different whitepoint and/or gamma, there are better working spaces than Adobe RGB.
02/21/2004 02:19:57 PM · #3
Thanks Dale. I'm going to try that. I think I've been exporting my RAW in the 16b/s format and not the Adobe RGB. I've seen some people talk about it but now I see I need to learn more.
02/21/2004 02:51:24 PM · #4
OK, I figured out how to make PSP use the correct color profile but I have a question. What's the difference between the Adobe RGB (1998) and the Adobe RGB?
02/21/2004 03:05:32 PM · #5
OK, I may have answered my own question here. Read the article.

Adobe RGB (1998)
02/21/2004 03:08:54 PM · #6
Just to note, I'm pretty sure that "Save for Web..." does NOT convert to sRGB. I can remember a few times where I've noticed a dull, flat image when I bring up the "Save for Web..." window. Of course, after converting to sRGB, the image looks fine in SFW.
02/21/2004 03:24:49 PM · #7
Yup, you want to edit in Adobe RGB, but when you want to save for the web, you want to convert it to sRGB, with which ever rendering intent you like the most (typically relative colourmetric or perceptual) then save for web

If you don't convert first, for most web browsers, you've effectively thrown away all the profile information, with the result you'll do a straight assign to sRGB, rather than converting into that space. This typically leads to the weird colour shifts and washed out uploads that many complain about.
02/21/2004 03:27:51 PM · #8
PSP-7 doesn't have a save for web. I didn't see anywhere I could change colorspace when rendering the photo after edit. Does PSP-8 have this functionality?
02/21/2004 04:02:14 PM · #9
paint shop pro7 does have a save for the web function as such,if with a image opened in psp7.goto file /export /jpeg optimiser and play with that function till you get an acceptable compromise between quality and d/load time.Hope this helps
02/21/2004 04:20:42 PM · #10
Last time I checked, PSP 7 and 8 will open 12/16-bit (per channel) files, but converts them to 8-bit upon opening. I don't know what kind of colour profile support they have, if any at all.

You might consider trying (30 free trial) Picture Window (Pro) from Digital Light & Color which supports both 16-bit editing and color profiles. I'm not sure what it's soft-proofing capabilities are, if any.
02/21/2004 06:08:08 PM · #11
Originally posted by dwoolridge:

Last time I checked, PSP 7 and 8 will open 12/16-bit (per channel) files, but converts them to 8-bit upon opening. I don't know what kind of colour profile support they have, if any at all.


Well, that kind of sucks. Are you sure? All my images say 16/24 bit depth. I did searches but didnt find anything about it.
02/21/2004 06:47:40 PM · #12
Originally posted by deafwolf:

Well, that kind of sucks. Are you sure? All my images say 16/24 bit depth. I did searches but didnt find anything about it.


Just in case, I just downloaded a trial version of psp8 and while it does seem to have some rudimentary support for color management, it certainly doesn't appear to support 16-bit (per channel) images. What it calls 24 bit depth, is per pixel (where an RGB pixel consists of 3 channels), so that's only 8 bits per channel.

Out of the box it didn't seem to care that my .tif file was in adobe rgb and I couldn't find anything (on first and second glance) that would allow me to convert to other colour spaces. It does support some kind of soft-proofing, but again it's not very comprehensive.

My 30 second evaluation: Avoid PSP if you are serious about a color managed workflow or 16-bit editing.

I'll repeat that Picture Window Pro is reasonably priced and does support color profiles and 16-bit editing. It's free to try, so why not?
02/21/2004 06:52:25 PM · #13
Dale, why did you stop entering the competitions? You have some nice shots dude!
04/16/2004 09:29:21 AM · #14
I take shoot (raw mode) with my camera (Nikon D2H) and I don't have on my printer (epson R800 with recommended paper) what i see on the screen of my computer (sony G520): Help please !!!
Where do i act on :
sony g520 ? photoshop ? printer ? windows xp pro ?
thanks for your precise advice.
Hugues
04/16/2004 10:54:14 AM · #15
Originally posted by deafwolf:


Well, that kind of sucks. Are you sure? All my images say 16/24 bit depth. I did searches but didnt find anything about it.


24 bit depth is 8 bits per pixel(channel), of Red, Green and Blue (RGB)

16 bit per pixel(channel) images are actually 48 bit depth images.
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