Re: Some Kallitype observations
Which inkjet printer are you using that shows the vertical bands? Are they perpindicular to the direction the print head travels? Vertical bands of about 1/4 " width and evenly spaced usually are roller marks on ink that has not dried. The soft fluctuations in density that are about 1" in width and parallel to the pinter head travel are "venetian blinds", the cause of which are yet unkown, but related to a variation in ink density in the negative that appear in the higher values of the final print. The only printer in the Epson line yet not to exhibit this is the Epson R1800. They are much reduced in the R2400 but still visible. My suspicion is that they are caused by fluctations in the print head itself and not related to media, etc. I have sent info to Epson on this and the Pictorico company is also currently contacting them. I have yet to see a means of eliminating them. Not all printers of the same model exhibit them. Typically they appear in upper midtones and highlights in larger areas of smooth tonal transition... wonderful for those who do landscape.
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Precision Digital Negatives--The Book
PDNPrint Forum at Yahoo Groups
In a message dated 9/2/06 8:47:27 PM, firstname.lastname@example.org writes:
I have occasionally run into vertical banding in prints which feature a
fair (Caucasian) skin. This was particularly noticeable in Pt/Pds.
After a trouble-free span, this problem has reared its head in Kallis.
Despite experimenting with modifications to the neg file (printed on
Pictorico), I have not yet succeeded fully in eliminating the problem.
However, I found that printing on Stonehenge (B side) and using
double-toning with Pt and Au, the bands are barely visible, whereas
printing on Arches Platine reveals them fully.
Suggestions to cure the problem will be appreciated. Rajul