On 20 Aug 2003 at 20:25, [EMAIL PROTECTED] wrote: > Hutcheson claims that "the transparent IT8 target has a lower D-max than > typical slide film. And hence the scanner profile made from that target > will fail to see very dark shadow details". > What is your comment on that?
The claims made by Hutcheson about IT 8 targets are really just plain wrong and the IT 8 standard is pretty clear on the dmax (and other) field(s): "The minimum transmittance factor that a photographic film can achive". Now he claims to produce an targets with a bigger gamut/density range than IT 8 targets offer. But compare the reference files for the HCT targets with those of the cheap IT 8 targets sold on coloraid.de and you will see a different story ;-) > Also, could you provide links to the above publications? I would recommend a nice book from Henry R Kang: "Color Technology for electronic imaging devices". Very easy to read and contains lot's of figures/test regarding scanner color correction. Definitly a starting point and the widely used method in this book is pretty much on the level of various commercial tools :-( Lcms surely is much better ;-9 In this book you also find a table linking the number of patches used for calibration and the error limit achived. And from my exerience with my freeware scanner profiling software the figures given are correct in real-life. But you also find other papers on this issue from the sources below: Many usefull info can be found on http://www.spie.org. They also publish the Kang books. Just use their nice search engine. For instance the "Color Imaging: Device Independent Color, Color Hard Copy and Graphics Arts" series has lot's of usefull info and they now offer the series and other usefull info on a relativly cheap single CDROM ;-) (hurts a bit after buying the much more expensive books... but CD does allow searching the articles.. so bought it twice :-) Being a SPIE member since years, I can really only recommend them to any developer and I am still surpised to often find commercial color software developers not knowing this (and other) organisation... And I think there are some scanner profiling articles in the IEEE image processing journal... again, use their search engine... Also check IS&T... -- Wolf Faust Tel: +49-69-5486556 mailto:[EMAIL PROTECTED] Fax: +49-69-95409598 http://www.coloraid.de Mobile: +49-179-6924769 ------------------------------------------------------- This SF.net email is sponsored by: VM Ware With VMware you can run multiple operating systems on a single machine. WITHOUT REBOOTING! Mix Linux / Windows / Novell virtual machines at the same time. Free trial click here:http://www.vmware.com/wl/offer/358/0 _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
