Hey, thanks for chiming in...you've given spot-on advice.I find that rod coating on a perfectly level surface makes a difference. I have a work surface that slopes slightly downwards to the left, though you wouldn't notice just by looking; if I coat paper for VDB on that surface, the left side of the print will be slightly, but visibly, denser than the right. Therefore, I use a different surface for that task.
On the other hand, if the effect was measurable but not visible, I wouldn't care. That's the issue the EDN coating test... it's more sensitive than me. So it's a matter of judging the importance of the result.
Thanks, that's one I'd never heard before and sounds like a good strategy for larger prints. Will keep it in the idea quiver for sure....If it’s any help I brush the paper with distilled water and wait until it’s almost dry before coating. I get very even coating that way
Thanks...using Hahnemuhle Platinum Rag for my first round of testing. Figured that would eliminate a few troublesome variables as a beginner to the hand coating game. Will put the Tween 20 idea in the quiver as wellAnd if the paper is really not cooperative, add a little T-20 to the brushing water.
:Niranjan.
Thanks...using Hahnemuhle Platinum Rag for my first round of testing. Figured that would eliminate a few troublesome variables as a beginner to the hand coating game. Will put the Tween 20 idea in the quiver as well
Yeah, bowing can be a problem. What is that tacky surface on the glass?
Even the scanner can add artifacts because of cross-reflections. Turn the paper around 90 degrees and see if the relationship holds.
:Niranjan.
I used double sided carpet tape...after putting the paper side of each strip of tape onto my wife's pile jacket about 10 times.
Not sure of the archival-ness though...there might bits of glue which stay on the paper. The pile fibres were such that no paper fibres came off the back of the print, so maybe its okay. Would have to test somehow, before committing serious work to it.Nice trick. Thanks for sharing.
:Niranjan.
Thanks for the suggestion.Even the scanner can add artifacts because of cross-reflections. Turn the paper around 90 degrees and see if the relationship holds.
:Niranjan.
Might try the copy stand & digital camera route next
Thanks for the tips. I've got a 4 light copy stand setup, so will give it Niranjan's spin & redo test to see if it's accurate.Give it a try, but keep in mind that illuminating a sheet evenly may not be as easy as it seems, especially with the kind of accuracy you're aiming for.
The bees knees is of course a proper densitometer. If you're planning on doing a lot of this stuff, I'd recommend looking into this option.
Good luck on the calibration thing - I don't care to count (and in fact, couldn't) how many calibration sheets I must have printed...enough to make me wake up in sweat at night!
Thanks for the suggestion.
Gave the print a 180 degree spin and scanned it again. The pattern of errors wasn't mirrored on the left side of the graph this time, and the percentage of error dropped from 6% to 5.28% with the same print.
We have an old copy/scan/fax machine...looks like an upgrade is in order. Might try the copy stand & digital camera route next, to see if that's more accurate before shelling out the money to buy a better designed scanner.
I did centre the print and covered it with some black material when scanned. Don't have PS.If I understand correctly, the error didn't move with the paper but it stayed at the same side as the scanner. If true, this would mean nearly all your error now is basically induced by the scanner and your coating is pretty good.
What if you add the two scans - you can do that in PS if you have. Rotate the second one back, move it over the 1st layer, align and then give the 2nd layer 50% opacity, flatten. Let Mrhar look at it again.
Most likely you are getting the reflections on the side that has the white cover over the glass. You can may be get better data if you center the print and put a matte black board over it so the reflections are minimized. I do all my scans this way. I think this problem is not any different on high end scanners - I have the Epson 3200 and it's an issue there also.
:Niranjan.
there's a point where subtle image textures disappear into the texture of the paper.
Yup, like Mt Everest is easier than K2...There seems to be a slew of things to ck for something called "Easy" :>}
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?