Archived posting to the Leica Users Group, 1998/11/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Carsten I understand your point about the contrast reduction (which really is another way of stating "modulation transfer"), but keep in mind that the original subject is a set of black lines on a white background, which seems to me to represent an upper contrast bound. How could reproduced contrast be any greater than this? In any case, as Nathan noted earlier, I've sent messages to Fuji requesting an explanation. My first two were rejected by their mail server, so I tried a (second) alternate route. If and when I get a response, I'll post it. Best regards. Dick Chandler >looks I donīt explain very well. Another try : we are not about 'more >detail' here, but about 'more contrast' (i.e. a bigger difference in >luminance/light transmission). The y-axis of the MTF graph denotes how much >of the contrast between the white and the black lines of the resolution >target is reproduced on the film. So 50% means that the contrast on film >would be half of the original contrast. >A value above 100% can be achieved by contrasty films. The best example is >a special kind of repro film (donīt know the correct English word, in >German itīs called 'Strichfilm') that is either black or white but never >grey. This is simply achieved by the film exaggerating whatever contrast >there is. > >Hope this helps > >Carsten > >http://ourworld.compuserve.com/homepages/Carsten_Bockermann/ > >------------------------------ > >End of Leica Users digest V4 #71 >******************************** > >