According to Ed Hamrick, in his software, all channels scan equally percentage wise for black and white. For chromogenic films, I do not know because it would seem you would not be setting the scanning software on grayscale or b&w when scanning it but on RBG even though it is suppose to produce grayscale.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Arthur Entlich Sent: Saturday, February 02, 2002 4:34 AM To: [EMAIL PROTECTED] Subject: [filmscanners] Re: Scanning chromogenic Just for clarification, because I was not aware of this: 1) In the case of a film scanner, if one sets the scanner driver to black and white film, and it scans in greyscale, is there a standard method this is accomplished? In other words, does it only use the green channel to create the scan or does it take a RGB scan and then discard the R and B channels? Or do some create some type of mixed channel file? In Photoshop, when I take an RGB scan and convert it to greyscale in the "Image-Mode" menu, and the program indicates "discard color information" is Photocopy really just dumping the R and B channel info and using the G as the full greyscale info? Indeed, if this is the case, then desaturation might prove best. Art [EMAIL PROTECTED] wrote: > On Thu, 31 Jan 2002 22:58:10 +1100 Op's ([EMAIL PROTECTED]) > wrote: > > >>Then what happens when an image scanned in colour is desaturated in >>Photoshop and printed >>with colour inks. Epson do say, as you mentioned also, that by printing >>in this manor gives >>a smoother gradient. >> >>By keeping the scan colour RGB and desaturating it there is more >>information kept than >>scanning in grey scale. >> > > I agree with this. Scanning greyscale usually only uses one channel (green, > typically). You get much smoother tones and lower apparent grain > by scanning RGB and then discarding colour information. > > Regards > > Tony Sleep > ---------------------------------------------------------------------------- ------------ Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body
