Jeremy mail-at-jeremyhilder.com (Jeremy Hilder)::28/9/04::12:54 pm:: GMT+0100
>Dear List, > >I have just had a high res [120mb] Crosfield drum scan done which opens as a >'untagged PictureViewer document'. On questioning why it didn't have a >profile, I was told that no one had ever asked them that. Is this usual? it's not unusual. sadly. I wonder if it's even a real RGB scan, some Crosfields are apparently hard wired to make CMYK. When needing RGB, the only way in that case is to convert to RGB or to strip the K channel and invert, neither are satisfactory, really. > >Should I assign my working space [Adobe RGB] and re-save or should I >insist they provide the scan with an embedded profile? If you insist they will be unlikely to be able to help I feel. If they had a scaner profile I doubt you'd be where you are now. Of course they could just open the file and assign Adobe RGB, or whatever you ask for, then re send it to you. But that's not really what you want. It's now labelled Adobe RGB but what IS IT really? Remember: RGB is not a definition of colour, it's a set of numerical values which produces differrent colours on different devices. [same goes for CMYK]. It is only the association of a correct colour space that gives the RGB or CMYK numbers meaning (by referring them to the Lab colour space). Assign the incorrect colour space and you just altered all the colours. What you ideally require is a scan which has been converted to a workingspace of your choice from a properly assessed scanner space (i.e. as defined by a well made ICC profile of the scanner). If you assign Adobe RGB beware the increase in saturation which may result. >Is there any disadvantage in >assigning a profile to a scan without one at this stage assuming they are >using the same working space? [I think they're using Adobe RGB]. In order for Photoshop to display the file a profile must be assigned, if you don't do it then Photoshop (since v7) will use the default RGB workingspace [ see your color settings ]. >I'm using PS6.0.1 and OS9.2.2. I see that you say you're using ps 6, I think PS 6 does this too (no copy here, I'm in a hotel as I did a colour management semninar with US guru Steve Upton Tuesday), as I recall v 5 was the last to effectively use monitor space as default for untagged scans. You can clarify this by assigning the default workingspace and observing as change in appearance - or lack of change. In the case of this scan, if you have a properly calibrated and profiled screen then you can assign the various workingspaces available to you and observe appearance, choose what looks best. that's it. save. What you're looking for next time is a scanning service provider who operates in the modern world and, as such, has a properly set-up and fully icc profiled scanner and whom will provide you with a scan that has small spaces at each end of the histogram [i.e. no data<washing> up against the ends]. They should ask you questions such as: 1: do you want a 16 bit or 8 bit scan? 2: do you have a preference as to ICC colour space? 3: what is the repro size and ppi required or do you just want a full rez scan? try: Jack Lowe Richard Kenward Regards, Neil Barstow :: Apple Solutions Expert :: colourmanagement.net Consulting in Imaging & Colour Management, custom profiling, training, seminars implementation :: WE RESELL :- Gretag+eyeOne :: basICColor Squid, Display etc. XRite. :: GTI viewing booths :: Epson :: Proofmaster RIP + ISO Proofing solutions www.colourmanagement.net/ :: www.apple.com/uk/creative/neilbarstow/ =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
