I assumed that there was a problem with the color space, so I tried using the Adobe RGB color space that I had good results from couple of years ago. The *ist-Ds will only allow sRGB or Adobe RGB for recording purposes, and I have the *ist-Ds set for Adobe RGB, (now I'm not sure that makes any difference when shooting in RAW at this point). I opened the file in RSE, modified color balance, enhanced the shadow contrast, (so I had more or less nice black skys), double checked that everything looked like I expected and exported a TIFF. It automatically opened in Photoshop and it looked just like the image exported in ProPhoto color space... I do understand color space at least a bit. I know that ProPhoto haa a larger gamet why however does AdobeRGB->AdobeRGB->AdobeRGB end up losing colors, especially since I used that conversion method before with predictable results...In fact why does it give exactly the same results as AdobeRGB->ProPhoto->AdobeRGB. Based on the results I've seen from other conversions I've done it shouldn't.
Brian Walters wrote: > Every time I think I understand colourspace conversions (or something > else to do with digital capture), someone on the list shatters my > illusions! Learning new things is one of the great benefits of PDML. > > Thanks for posting that explanation, Godfrey. > > > Cheers > > Brian > > ++++++++++++++++++++++++++++++++++ > Brian Walters > Western Sydney Australia > http://members.westnet.com.au/brianwal/SL/ > > > > On Wed, 09 Jul 2008 11:52:04 -0700, "Godfrey DiGiorgi" <[EMAIL PROTECTED]> > said: > >> There's no mystery to it other than that you need to understand >> colorspaces better. >> >> ProPhoto RGB describes a much larger color gamut than Adobe RGB or >> sRGB. If you have subtle colors in ProPhoto RGB and they disappear >> when you convert to sRGB or Adobe RGB, they've been clipped as they >> cannot be represented in the target colorspace. Once clipped, they >> cannot be recovered by converting back to the larger colorspace ... >> the data has been lost, you need to go to the original file to >> retrieve them. You might try different rendering intents ... Relative >> Colorimetric basically moves all 'out of bound' colors to the limits >> of a particular colorspace where Perceptual attempts to translate all >> colors into the target colorspace as best can be arranged. >> >> Here's a way to see what's going on: convert a RAW file to a >> [EMAIL PROTECTED], ProPhoto RGB file and open it in Photoshop. Have the >> Histogram palette open, full RGB display. Then convert the colors to >> the Adobe RGB profile with Relative Colorimetic intent ... toggle the >> action with the "undo" command a couple of times and watch the >> histograms. You'll see where the clipping is. Do the same with the >> Perceptual intent. Once you see where the clipping is, go back to the >> ProPhoto RGB rendering and adjust the color rendering to move values >> in those areas back into the "safe" zone. Then you can convert to a >> smaller profile with greater ease. >> >> (When you're working with a printer output profile, you can do the >> same thing using the proofing setup and even turn on gamut warning >> flags, but I don't recall that Photoshop 7 has these features. I have >> PS CS2.) >> >> Godfrey >> >> >> On Jul 9, 2008, at 11:18 AM, P. J. Alling wrote: >> >> >>> Raw Shooter Essentials, it's much better looking, without any >>> Photoshop >>> work before export as a TIKF. I recently started using ProPhoto color >>> space in my work flow which seems to give better results, if I >>> remember >>> to convert the profile in Photoshop before output, so I changed >>> back to >>> the Adobe RGB profile and it made no difference. The last set of >>> fireworks I processed, some time ago looked exactly the same when >>> imported into Photoshop after conversion. >>> >>> http://home.earthlink.net/~morephotos/fireworks/PESO_-- >>> _fireworks1a.html >>> >>> It's really quite annoying. >>> >>> David J Brooks wrote: >>> >>>> I like the pattern of the blast, very good. >>>> >>>> What do you convert with.? >>>> >>>> Dave >>>> >>>> -- You get further with a kind word and a gun, than with a kind word alone. --Al Capone. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
