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FORUMS Post Processing, Marketing & Presenting Photos RAW, Post Processing & Printing 
Thread started 20 Nov 2009 (Friday) 23:08
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Radial Gradient Banding

 
Apollo.11
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Nov 20, 2009 23:08 |  #1

Hi, I had a white photo I shot in raw. I edited in PSE7 to turn the entire background white then added radial gradient. It was shifted the colors around a bit to turn the gradient from tan to blue. I noticed a little banding on the psd, but it really showed up when I printed it. When I decreased the exposure, it was really obvious. What caused that? Can I do something differently to prevent it?

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Nov 20, 2009 23:11 |  #2

Usually adding a small amount of noise will fix it. Try 2%.


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Apollo.11
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Nov 20, 2009 23:14 |  #3

Damien, how do I add noise?


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basroil
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Nov 21, 2009 00:23 |  #4

1) process in 16 bit only
2) you can add noise by looking though "filter", though i don't know where exactly it'll be for your specific version of photoshop


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René ­ Damkot
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Nov 21, 2009 12:52 |  #5

Filter > Noise > Add noise


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Apollo.11
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Nov 22, 2009 13:14 |  #6

Thanks all. Got it.


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Nov 22, 2009 16:02 |  #7

This is one of the few cases where 16 bit processing will shine :)


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Nov 22, 2009 16:28 |  #8

Can someone show an example with the OP s image?

The 16 bit mode does not act any different than 8 bit mode when adding 2% noise on my computer ( 2% does not get rid of banding, about 7% gets rid of the banding but then you are stuck with a lot of noise ).

I see this all the time on forums, that you should put noise in the image, but how do you get rid of the noise =) ?


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basroil
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Nov 22, 2009 18:48 |  #9

pellepiano wrote in post #9062984 (external link)
Can someone show an example with the OP s image?

The 16 bit mode does not act any different than 8 bit mode when adding 2% noise on my computer ( 2% does not get rid of banding, about 7% gets rid of the banding but then you are stuck with a lot of noise ).

I see this all the time on forums, that you should put noise in the image, but how do you get rid of the noise =) ?

Point is that you shoot RAW, open as a 16bit image, then add the gradient WHILE it is 16bit. making it 8 bit then changing it to 16bit won't do anything. The other thing is that it will be impossible to check to see if 16bit works on a monitor, the only way to check is to print it to a high bit-depth printer and see. All (normal) monitors are limited to 8bit display, so you will see banding in some things.


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Nov 23, 2009 03:49 |  #10

Ok, so the 16 bit advice is not to save the OPs image , only for printing reasons.

But is there any way to save the OP's image, to get rid of the present banding?


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Nov 23, 2009 04:22 as a reply to  @ pellepiano's post |  #11

Sadly Elements 16bit editing ability is distinctly limited.

You might try adding the gradient as a separate layer then applying a healthy dose of blur to try and reduce the stepping.


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ChasP505
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Nov 23, 2009 07:53 as a reply to  @ Electric Shepherd's post |  #12

So no one thinks that the banding may be due to a bad profile? You can download and view this Linearization test chart (external link) in Photoshop.

Or maybe your video card needs an upgrade?


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basroil
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Nov 23, 2009 09:20 |  #13

Electric Shepherd wrote in post #9065990 (external link)
Sadly Elements 16bit editing ability is distinctly limited.

You might try adding the gradient as a separate layer then applying a healthy dose of blur to try and reduce the stepping.

limited in what ways? should be able to apply the standard image correction, blur and sharpening filters regardless of bitdepth.


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Nov 23, 2009 09:34 |  #14

This is how I added the gradient. I had a new blank layer and created the gradient. I went back to the photo layer and selected multiply to blend the layers. Is this the best way to add a gradient?

Before reading all the new posts about 16bit. I tried something different which may have fixed the problem. Originally, I started with a tan gradient and shifted the hue to blue. This time, I started out with a blue gradient, and shift only slightly to get the blue tone I wanted. It looks good on the monitor, I'll have to test print to know for sure.

Based on the comments here it and for work flow reasons, I think I should upgrade out of Elements (and CS3 is cheap now). Can you post your opinions on upgrading in a new thread I posted?

https://photography-on-the.net/forum/showthre​ad.php?t=785656


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Nov 23, 2009 09:45 |  #15

any chance you can upload the PSD?

oh and it will get worse as you decrease the 'exposure' because your compressing the dynamic range of the 8bit file..


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