Computers and Software > Separation Programs

Halftone banding in PS when using bitmap to create halftones?

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Sbrem:
Well then, that is a tad bizarre...

Steve

mimosatexas:
Yea seriously.  I have no idea why it is happening...

I've used this method for YEARS without this happening.  I've noticed it occasionally on certain prints in certain areas before, but chocked it up to a film issue and it wasn't ruining prints, but the last few jobs it is noticeably happening in photoshop and it definitely noticable in the prints.  Maybe I am just more sensitive to it now that I see it, but it is driving me nuts...

Dottonedan:
I'll have to look later, in Photoshop and do some comparison, but it could be related to or a result of pixel aspect ratio. Not sure if this is even the tight area in thinking of, but I'm referring to you pdf pixel dimensions. You have options when opening a file or creating new art (for a desired purpose or target). We don't normally get into this, but it's there. It may be to accommodate different input sources like camera formats etc. (again guessing). If accidentally changed from default, or digging and playing with options some time ago, it may be presenting odd patterns that conflict with various angles. I'm only reaching here, but seems feasible.

Certainly related to settings in psd. That's why a True RIP is better than the psd halftone method but it works. Just have to deal with this type of stuff sometimes. Ps dots are also not consistent in line count. It's really based on resolution. For example, a 50 lpi at 300 ppi will come out with maybe 49, 50 or 51 lines. 600 ppi may come out with other numbers of lines per inch. All i'm saying is it not totally accurate but makes no real difference in print.

Squeegie:
I had been using the bitmap conversion in PS for a long time without any issues. Then, one day, I had the same or virtually the same banding/moire issue. I could not make it go away.  I tried countless DPI and LPI combinations with no success. 
I think I even had a discussion with DottoneDan about it.

The end result for me was to break down and buy a RIP.  I am now using the T-Rip software with outstanding results...from within any program.

Best of luck,
Bill

Dottonedan:

--- Quote from: Squeegie on April 03, 2015, 04:21:45 PM ---I had been using the bitmap conversion in PS for a long time without any issues. Then, one day, I had the same or virtually the same banding/moire issue. I could not make it go away.  I tried countless DPI and LPI combinations with no success. 
I think I even had a discussion with DottoneDan about it.

The end result for me was to break down and buy a RIP.  I am now using the T-Rip software with outstanding results...from within any program.

Best of luck,
Bill

--- End quote ---

I'll 2nd the outstanding results. ;)

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