One centered dark band-is this common?

[Rocco Penny]

practice practice practice-
ok working on making a large print from a smaller image,
on doubling the size of the print,
this band appears down the middle all the way from one edge to the other

does this appear to be beginner's mistakes?
Is there a heading in my cs4ps textbook I should be studying?
OK thanks
[attachment=16229:_DSC4307.JPG]

[BernardLanguillier]

practice practice practice-
ok working on making a large print from a smaller image,
on doubling the size of the print,
this band appears down the middle all the way from one edge to the other

does this appear to be beginner's mistakes?
Is there a heading in my cs4ps textbook I should be studying?
OK thanks
[attachment=16229:_DSC4307.JPG]

Not sure what you are actually doing here... what method are you using to print larger?

- PS up-scaling?
- printer driver change?

Also, does it show with other images printed the same size?

Cheers,
Bernard

[Rocco Penny]

hello, thank you,
yes,
cs4ps and upres in application
I had banding in another exposure after upres.
Only two exposures, both worst in the bright blue of the sky, and only when I enlarged them to two hunnert percent of native size.
On any paper, and worse on shinier paper
thank you for the time

[Wayne Fox]

hello, thank you,
yes,
cs4ps and upres in application
I had banding in another exposure after upres.
Only two exposures, both worst in the bright blue of the sky, and only when I enlarged them to two hunnert percent of native size.
On any paper, and worse on shinier paper
thank you for the time

Can you see it in the file itself after you uprez on the screen or only when you print it?  Is the print printed lengthwise?  It almost looks like a printing artifact to me ... as though the paper hit something and didn't move correctly.

[Rocco Penny]

Hi thank you,
there is no problem with the original file according to my monitor, and smaller prints of the same image have no band. I'm printing 36x24 on a 24" printer.
I believe there may have been a problem with the paper advancing on the 1rst Hahnemuhle pr baryta print I made,
but surely not on the HP aquarella seen on my table above.
That same line, in the same place, appeared on each 1/2 way through the print job only when enlarged from 100% to 200%. I'd cancel the job at that point, but since the ocean and sunset are further toward the end, and the color is critical at the point where the sun hits the water, I just let it continue so I can see what the deal is.
I'll start over as the color is not what I wanted either.
The wasted paper and ink are becoming a concern as these aren't smallish images.
I appreciate your comments.
Thanks again,
Rocco

[Wayne Fox]

Hi thank you,
there is no problem with the original file according to my monitor, and smaller prints of the same image have no band. I'm printing 36x24 on a 24" printer.
I believe there may have been a problem with the paper advancing on the 1rst Hahnemuhle pr baryta print I made,
but surely not on the HP aquarella seen on my table above.
That same line, in the same place, appeared on each 1/2 way through the print job only when enlarged from 100% to 200%. I'd cancel the job at that point, but since the ocean and sunset are further toward the end, and the color is critical at the point where the sun hits the water, I just let it continue so I can see what the deal is.
I'll start over as the color is not what I wanted either.
The wasted paper and ink are becoming a concern as these aren't smallish images.
I appreciate your comments.
Thanks again,
Rocco

Even though smaller prints don't show the banding, those prints didn't extend out of the printer as far so there still might be some physical problem.  I've never seen an artifact like this when uprezzing a file.

What is the resolution of the file?  Have you sent the file at native resolution and let the printer driver uprez rather than doing it in Photoshop? Is there anything else about the file that might be causing the problem (various layers or layer masks), or did you flatten the file before the uprez?

[Panopeeper]

This crop shows horrendeous JPEG artifacts, which can turn even in banding (if I see that, what you mean with banding). Perhaps the quality of the source JPEG was low before upsizing.

[Rocco Penny]

yes
 12.9mp camera, 24.5 mb raw file, printing @ 300ppi, 1200x1200 dpi resulting in a native resolution print size of around 14x9.5 inches.
I'm printing this greatly enlarged sunset image by following the direction of the 2 fellas in the 'From Camera To Print' training vids,
augmented by a tome I possess explaining the nuts and bolts of cs4ps.
I use RAW adobe rgb 14 bit, transfer to my seagate, open in photoshop, and do what little processing I'm capable of there.
I print using the application.
I have used the printer managed color as well, but not on this image at this size.  I believe we're all seeing the attachment above in terrifically manipulated colorspace resulting from raw to jpeg conversion and reduction of an already marginally focused image.
I just wanted to show that one band in particular.
It really only appears on this greatly enlarged print.
And so far only on this one and one other exposure.
This band bisects the print longitudinally and I sure would be happy to never see it again!
I'm a little apprehensive about letting her rip again, expecting a different outcome, and having that same darn line!
Oh well, whachagonnado?
I'm so grateful for the time you've each spent,
thank you,
I should go shooting before dark...
Rocco