I posted about this problem a while ago and got zero response, so am attempting to reformulate the question (see last paragraph):
I am currently applying a rather large gaussian blur to a scanned image. All looks fine. I then apply a little bit of noise to remove stepping/banding of colour. 'The anomaly' (see next para) is just visible... but only just, at 200%, if i squint, look away and surprise it etc. I then convert to printer/paper profile (which looks pretty much the same) and print on Epson 1290. It is when printed that 'the anomaly' really appears: there is a blend from (coincidentally) about skin tone to green, and about halfway through the blend there appears in the print a band of much brighter green, almost like a halo. Sadly this is totally unacceptable, and cannot be manually corrected because (for reasons I won't go on about here) the image has to be almost a clone of another image (which I am also preparing and which also suffers from the anomaly) and any difference between the two images will be instantly visible. Any corrections have to be mechanical so that they can be applied to both images identically. It doesn't matter if I do the GB in 16it, whether i do or don't apply noise (unless i apply so much that it becomes a problem in itself), or whether i work in the printer colour space. Incidentally, if i do a mode change to CMYK then I do see the anomaly, but all the other colours are much more horrid than the RGB to printer profile conversion, and getting them back would introduce loads more differences between the 2 images (probably). Is there some other similar kind of blur effect that I could use (that I have severity control over), or some other way of getting the same effect but without the halo, or correcting the halo? My head hurts from banging it against that brick wall... any one else any ideas? Giles Stokoe photographer/photojournalist. See some images at http://www.stokoe.co.uk =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
