Jorge What a lot of questions. [left them unclipped, how could I clip and leave the nub of the question!]
I think you'll find that as you are calibrating visually (no instrument) your expectations of the colour temperature and gamma you achieved could be quite unrealistic. Your experience serves to underline the need for an instrument (colorimeter or spectrophotometer) and good software. And yes, Mac requires 1.8 gamma for colour managed working is a myth. Mac LCD's are usually native gamma close to 2.2, almost all CRT's are native gamma close to 2.2. Only Apple branded CRT's are native gamma 1.8. [Anyway the colour management takes care of the difference, such that 2 properly calibrated screens, one 1.8, one 2.2, both displaying the same Photoshop image would look pretty much identical. Only in a non colour management savvy application like some web browsers would you see a difference. Where the application uses the profile, it <knows> to adjust for the actual calibrated gamma. ] an urban myth? you decide! Just to make it more complex - color-solutions basICColor Display (my favourite display calibration application) allows a non gamma based (i.e. Luminance based) calibration of the grey gradation. Much superior. photography-at-icnet.com.ve (Jorge Parra)::5/10/04::1:46 pm:: GMT-0400 > >On oct 5, 2004, at 03:57 AM, Neil Barstow wrote: > >> >> Apple's LCD's are lot closer to D65, Barco reference closer to D50. Not >> sure about the new Eizo, but the last one I saw was very close to D65 >> at native white. Same goes for laCie LCD. > >Just a few days ago a client who is trying to get into Color management >the "cheap" way, asked me if I could use some simple tool to make some >basic calibration for his monitors so we can stop arguing about why my >files print as I see them in my monitors and why he does not see the >same thing. ;-) > >Case is, I told him we could use the most basic tools as a start up, >by invoking Adobe Gamma utility, the Monaco EZ Color2 solution ( just a >variation of Adobe Gamma) and /or SuperCal utility (which provides of a >little more refined calibration tools), and I thought this would >provide at least a ballpark approach to color. > >The funny thing came out when I finally had the time to go to his >office ,I found he is using 2 computers and 2 monitors, one being a 17 >inches LCD ( and iMac 17" Flat Panel actually) and a standard 17" >ViewSonic CRT. >I just run the utilities as to provide a basic set up and ended up >with 2 altogether different looks for both screens. I just run the >tests individually ( different offices), but then the client asks: >well, which monitor should I use to see colors if they look soo >different? > >The only thing I found out, but totally empirically, was that if I run >the LCD in 2,2 ( which being a Mac, is supposedly wrong, and it should >go at gamma 1,8 .... or is this another Urban Myth?) and setting white >point at D65 level I could barely get any closer to the CRT for same >settings, but in actual, factual reality, if I arbitrarily set the LCD >White Point to D50, (both monitors still set at gamma 2.2), I get the >"creamy" look of the CRT set at D65 much more closely, but I understand >this can't just be done like this. There must a reason for this that >evades me. > >I just told the guy that I would return to re-check the monitors, >while suggesting he should think on getting more sofisticated >calibration gear to make it "the right way", and picking one monitor as >his formal reference, >( I suggested the CRT), but a sour aftertaste remained in my brain >after I left the office, just wondering what makes the LCD soo blue-ish >compared to CRT and how to deal with this as to be able to check the >same file in both units-without pretending to make detailed color >evaluations- but at least see something look-alike. > > I had not dealt with LCD's before, so if there is a basic premise that >I am not aware of , please enlighten me. Best Regards Neil Barstow Consulting in Imaging & Colour Management http://www.colourmanagement.net/ http://www.apple.com/uk/creative/neilbarstow/ =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
