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Doc Raster Effects on gaussian blur

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CS5, Mac 10.8.4.

We inherited a design at doc raster effects of 72 dpi, using a light blue PMS 291 arch shape that was gaussian blurred to make a soft arched gradient.

 

Screen Shot 2013-12-26 at 8.18.10 AM.png

Changed doc raster effects to 300 dpi, and the gradient turned into a solid of PMS 291. I edited the 90 gaussian blur amount to 21.6 =  (90 * 72)/300. That did not look right as the gradient was not soft but hard. Kept tweaking the gradient to find that it looked best at 59, when we went to 60 pixels then the gradient jumped to a solid lt blue with no gradient. Printed the 59 gaussian blue, and it looked like this coming out of our DC 240 color xerox laser printer (photoshopped to simulate, basically the gradient ends with a hard wave.)

2.png

 

So I said enough of this, I do not like the gaussian blur and wish Illustrator did not even have that as and option cause for final work causes to much trouble. Rebuilt this as a 3 step blend in PMS 291. Looked great on screen, but also printed like the second screen shot. Anyone have any idea what I can do. I am totally fine with getting rid of the gaussian blur, as we will be having many more new packaging coming in different sizes that will need this arched gradient.

 

Here are my doc raster effect settings. Would  like to know more about anti alias and the create clipping mask option. My question though is how to get rid of gradient ending hard.

 

Screen Shot 2013-12-26 at 8.16.54 AM.png


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