Gradient breaks in Printing

[ponnapati123]

Hi,

While the time of Gradient printing from solid to light background we are experiencing Gradient breaks in printing.
Is this bcoz of screen angle ? How to avoid Gradient breaks in Sheetfed offset printing.

 

[gordo]

Hi,

While the time of Gradient printing from solid to light background we are experiencing Gradient breaks in printing.
Is this bcoz of screen angle ? How to avoid Gradient breaks in Sheetfed offset printing.

Could you describe what you mean by "gradient breaks?"

Something like the top gradient (shade-stepping) or the bottom gradient (midtone bump) in this image? Or something else?

 

[ponnapati123]

Hi Gordo,

We are experiencing Gradation breaks something like top gradient (shade-stepping) from dark to light shade. In light shade only this gradation problem occurs.

 

[aqazi81]

Is this shade stepping also evident on plates?

 

[D Ink Man]

Taking a stab, blanket release or lack there of. Better release blanket might help? Just a stab.

D

 

[FileJockey]

Banding in some areas could be a calibration issue.

 

[dgilman]

We had banding with agfa azura plates, come to find out the line screen we were using was higher than the plate could handle.

 

[D Ink Man]

Any number of things......

 

[aqazi81]

@Ponnapati....plz provide some more info on the issue...Is this happening on all of your presses or a particular press or a unit, fountain solution pH and conductivity. rollers and blankets condition and any particular substrate?
As Filejockey said, it can be a ctp issue.

 

[ponnapati123]

We are experiencing this gradation issue on all presses. Whenever this gradation problem occurs we do color retouching in prepress, this will affect some times on other images also.

 

[gordo]

Do you have a grey levels setting on your RIP?

 

[Alois Senefelder]

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ponnapati 123

Fundamental Question !!!

IS a Halftone stepwedge IMAGED correctly on the plate ??? before it goes on the press ???????????????



Alois

 

[Alois Senefelder]

Again !!

Again !!

Hello fellow Lithographers,


AGAIN - we have lots of "interesting questions" for which answers from us are needed -

BUT many questions are "lost in translation" it seems a burden we must bear !


Regards, Alois

 

[lynnic]

Are these files by chance "old" - like from 5 years ago or so? Gradients (particularly in Illustrator) were created differently and would produce such banding.
Check raster effects settings in the art file. If files were created years ago it would be beneficial to recreate the gradients.

 

[tambo]

This stepping in the gradient can often be found in the file. The gradients will do this if made in InDesign. They should be made actual size in Photoshop, then imported into InDesign - problem solved!