Archived posting to the Leica Users Group, 2005/11/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]OOPS! just looked at my analysis again - the dark lines correspond to the lighter areas which are, of course the same colour as the spots, silly me!!!! Douglas Douglas Sharp wrote: > Hi Richard, > I analysed your image - here are most of your spots - at least those > which are around 1 pixel in size, amybe this helps to get closer to > the problem and a possible(partial fix. > http://gallery.leica-users.org/New-Old-Pictures/1_25WhiteSpots_Difference > > Difference analysis - spot distribution > http://gallery.leica-users.org/New-Old-Pictures/1_25WhiteSpots_HPF_1 > 1st iteration (pass) of Hot Pixel Fix > http://gallery.leica-users.org/New-Old-Pictures/1_25WhiteSpots_HPF_2 > 2nd iteration HPF > > Running HPF twice seems to get rid of a few more spots, the residual > spots can easily be edited out with "healing brush" in PS, I think the > analysis shows that these are minute particles, probably out of your > water supply, a couple of microns in size which would pass most water > filters,, the larger particles are probably airborne dust (1 remains > on the window pane, 1 to the right of the horizontal handrail around > the centre of the image. On a full resoluition input it would probably > be more effective.. > > Processing sequence: > > 1. input original image > 2. convert to RGB > 3. Duplicate > 4. Apply Hot Pixel Fix (mediachance.com DCE Tools) > 5. Select all on duplicate > 6. paste to original as layer > 7. Extract difference (100%) > 8. flatten image > 9. increase levels for display and save > > This image shows exactly what HPF is extracting from your original > image - to remove spots just run 1,2 and 4 (I ran 4 twice) - it worked > wonders on some 1950s negs I scanned for my parents. > The result is quite interesting when you look at the distribution, > there's a definite grid pattern which doesn't relate to the structure > of the original image, did you flat-dry the negs on some kind of frame?. > Douglas > > Douglas Sharp wrote: > >> Hi Richard, >> try scanning the neg as if if it was a colour slide 1) without FARE >> 2) with FARE, if they persist it is the negative, and not the >> scanner. Of course you get a negative image which will show the spots >> even better, so you can see if they're evenly distributed. If they >> are concentrated in one place, for example the bottom edge or towards >> the bottom of the film strip when it was hung up to dry, it could >> mean that the negatives went spotty during the washing and drying >> process - perhaps fine particles of scale in the (hard?) tap water. >> Just a suggestion >> Douglas >> >> >> Richard wrote: >> >>> I seem to get more of those with Efke 100 than Tri X and HP5+, even >>> though everything else is the same. (I developed my own using Jobo) >>> >>> At 11:08 PM 11/20/2005, Peter Klein wrote: >>> >>>> There were a lot of miniscule white spots on my Neopan 400 negs >>>> from San Francisco. I don't usually get these, at least not with >>>> Tri-X or T400CN. This picture is a 1:1 snippet of the "vertigo" >>>> picture from my SF gallery, but scanned on my Canon FS-4000us at >>>> 4000 dpi. The spots are most visible on the windows at the right, >>>> but they are actually all over the whole negative. >>>> http://gallery.leica-users.org/album186/1_25WhiteSpots >>>> >>>> The negs were developed at the same lab I usually use. What is all >>>> that white crud? Grain aliasing? Improper fixing? Chemical >>>> residue? Seems too prevalent to be dust. I couldn't see anything >>>> with my 22x loupe. But I could see many of the same spots both on >>>> the low-res Noritsu scans from the lab, and on a couple of pictures >>>> I rescanned myself at 4000 dpi. So something on the negative is >>>> making those spots. >>>> >>>> I know better than to use ICE (FARE actually) with real B&W, so >>>> that isn't it. >>>> >>>> --Peter >>> >>> >>> >>> >>> // richard (This email is for mailing lists. To reach me directly, >>> please use richard at imagecraft.com) >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >>> >>> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> >> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >