Banding after applying Gaussian blur

Hey all.
I'm working with a project in FCP7 running Lion. What im trying to do is add a gaussian blur with a light ray effect for the end of a song. It slowly blurs up and the light rays add a glow. Fades.
The video quality i'm working with is very good, so I don't believe there should be any problem applying these effects. When they are applied though, i get a banding effect which i really don't want to be there.
Still seconds before the effects begin to keyframe into existence
Still once the effects are being applied. It's a bit hard to see because the image was resized to be smaller. But if you look you can still see the banding around the brighter areas. The banding occurs after the Gaussian Blur is applied, so that seems to be the root cause.
Anyone have any ideas of how I can solve this? Footage is 1920x1080i Pro

That's the first thing that came to my mind...the order. I tried that and it did no good. I'll go back to that part of the project and see if it's still doing it. I added a directional blur and it worked. HMMM...

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How to batch apply Gaussian blur in Aperture

I find myself applying Gaussian Blur to a lot of our shots via Photoshop CS3.
We keep all our shots in Aperture, so I click the image to edit it in CS3, copy layer, apply gaussian blur and set transparency to 30-40%....
Is there a way to automate this ?

You can set up scripts/actions in PS which will automatically be applied to every image that is opened, but I can't remember how you do it. And it would be applied to every image whether you like it or not...
Ian
P.S. Most people are trying to sharpen the images, why blurring?

How do I get rid of the banding I see in Ai's gaussian blur?

There's banding in the gaussian blur, in Ai.
I'm new to Ai. I created a logo in INKSCAPE, (an open-source free vector program), and the gaussian blur worked fine. But the people that will carry the logo to the next step, use Ai. When I send svg files, (or other types of files), from INKSCAPE, the blur didn't carry over. So I'm trying Ai now... and I'm pretty upset. Do you have a work-around for this?
I was directed here from a survey I was asked to take part in by Adobe. The survey window gave me the impression I would be talking to the company... but I tend not to believe that!
When I tried to contact Adobe regarding the banding problem, I was only directed to the forum. I was already there... and now I wanted to talk to the company.

Try increasing the raster effect resolution to 300 - Effects menu > Document Raster Effects Settings...
If that does not solve your banding issue, post the screenshot and sample file and little more detail on what you are doing.

Gaussian Blur

Hi folks!
I am trying to understand gaussian blur, but can't get it to work how I imagined.
I have a square let us say 200x200 and have added a fill. When I try to apply gaussian blur it stll leaves square edges:
OK! If I drastically reduce the size of the square to say 75x75 - then the problem goes away....
The second image looks square only because of editing it in paint...lol
The problem seems solved; but if I enlarge my square with the applied gaussian blur - then it leaves square edges again.This causes problems when enlarging objects.
Is there a way around this problem?
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What actually happens is Illustrator creates a mask larger than the original object, then applies the blur within the mask.
You can control the size of the mask to a degree via Effect > Document Raster Effects Settings.
If your blur is greater than the area added for the mask, you get hard edges or you start seeing corners peek out around the blur.

Gaussian Blur keyframes on timeline - RIDICULOUS scaling

When adding keyframes to Gaussian Blur ...
If I view those keyframes on the timeline, it's bloody useless, because the scaling factor is absurd!
The range on the timeline is 0 - 30,000 !!
WHY?
No one uses gaussian blur with more than 100, maybe 200. Why does it go to 30,0000?
Do they have any editors working over there at Adobe?

He's talking about using the rubberband keyframe UI from within a clip in the timeline. If you apply gaussian blur, click the effects icon (in the clip header) then set the effect display to Gausiian Blur > Blurriness, then you can drag the line up to the top which will indeed show a value of 30000.
It happens this way because the timeline's rubberband UI is not optimized to control each and every effect parameter in the ideal way. Some value has to be chosen as a max for the rubberband to display and that max does nto always match what the user would do. But your problem is valid, and the need for improved effects controls has been heard. Please do submit your own feature request for it though if you want.
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Gaussian blur results in banding

Here's a piece of wall I try to gaussian blur (> 60 radius) and always results in bandings. I tried adding noise but it doesn't help, unless I add so much noise the image becomes unrecognizable.
Here's the same image in case the one above is re-compressed
blur
In case you wonder why blur this image, there is an electrical outlet near this wall (not shown) that I edited out and need to blur the edited area, and realize the resulting banding is caused by the wall and photoshop.
Are there other solutions?
I'm using photoshop CS4 in 16 bit mode.

Yes, I know what you're talking about. It's as though you don't want to accept the explanation.
With 24 bit color you will see the divisions between regions of identical RGB values in the 24 bit color space where they change by one level. It's most easily seen in gray or near gray gradients of dim luminosity (which is what you have here).
There is no uneven banding in the data in the image you posted. It's a 16 bit PNG file and the data is perfectly clean and smooth, which is what you'd expect from a large radius Gaussian Blur.
If you're seeing uneven or more severe banding on your display only, it's possible something in your system setup is amiss (e.g. a poorly constructed monitor profile, or a malfunctioning display driver), causing you to see multi-level jumps between adjacent regions of color.
On my very well tuned 24 bit color setup I can see the even (but very subtle) banding of your 16 bit image. Doing the following hides it completely:
If your display setup is functioning optimally you won't sense any banding in the above image (after having clicked it to make it show at full size of course).
-Noel

Layered PSD files getting corrupted when applying a gaussian blur.

A file is created then three layers to keep simple a red square is created using the marquee tool then filled with a colour this is repeated on the next layer with a different colour then the third layer is completely filled with another colour.
The first two layers are selected and scaled then made transparent.
Finally the layer in between layer 3 and layer 1 is selected and a gaussian blur is applied this is when the corruption occurs
Files are being created using Adobe Photoshop CS6 version v13.0.6 and OSX v10.9.3 on Mac Pro with the below specs:
Model Name: Mac Pro
Model Identifier: MacPro5,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.8 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 8 MB
Memory: 12 GB
Processor Interconnect Speed: 4.8 GT/s
ATI Radeon HD 5870:
Chipset Model: ATI Radeon HD 5870
Type: GPU
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 1024 MB
Vendor: ATI (0x1002)
Device ID: 0x6898
Revision ID: 0x0000
ROM Revision: 113-C0780C-194
EFI Driver Version: 01.00.436
Displays
CG277:
Resolution: 2560 x 1440
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Connection Type: DisplayPort
After file is corrupted Photoshop has to be closed and re-opened because subsequent files that are opened are corrupted.
This has been reported in CS5 and CS5.5 extensively but not so much in CS6.

Below is the steps that where used to create the corruption in the files.
Gausian Blur corruption in Photoshop
Step 1. Create document with 3 layers + Background.
Step 2. Layer 3 - Create a box (Red)
Step 3. Layer 2 - Create a box (Blue)
Step 4. Layer 1 – Fill layer (Yellow)
Step 5. Select layer 3 & 2 & scale down & press
return
Step 6. Change opacity of layer 1 & 2 to 25%
Step 7. Go to layer 2 and select Gaussian Blur filter
Please Note that the blue & Red Box Have changed
colour.
As I Zoom in and out the corruption gets worse.
Sometimes this corruption dose’nt show up until you have
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I'm trying to isolate skin with a secondary layer and am successful. I want to blur the skin to reduce blemishes but when doing so the blur and degrain sliders don't seem to have an effect. Can I apply a gaussian blur fx on just that secondary? Can't see

I'm trying to isolate skin with a secondary layer and am successful. I want to blur the skin to reduce blemishes but when doing so the blur and degrain sliders don't seem to have an effect. Can I apply a gaussian blur fx on just that secondary? Can't seem to figure this out. Is there a better way to smooth skin?

Here's an Adobe help page for isolating skin with suggestion on the use of the blur slider also:
https://helpx.adobe.com/speedgrade/using/apply-secondary-color-corrections.html
And here's one of the original creators of Iridas/SpeedGrade, Patrick Palmer, a six minute vid-tut on using secondaries (specifically in CS6 but this hasn't changed):
http://tv.adobe.com/watch/learn-speedgrade-cs6/secondary-color-correction-in-speedgrade-cs 6/
I'd note, the "blur" and "denoise" tools on the Secondary tab are more about smoothing the keying of the secondary ... they apply a bit of blur or de-noising to make the secondary smoother and cover over the odd pixel or three or four that don't "fit" the key of the secondary in the middle of something you're aiming for.
In current SpeedGrade, I'd try using the Guassian Blur (Range) effect, and sample a good range of the skin tones.
And a lot of people use Red Giant's "Cosmo" plug-in over in AfterEffects or Premiere Pro ... it's a tool designed specifically for working skin tones, dealing with blemishes, wrinkles, spots, and such.
Neil

Gaussian blur does not blur all the way creating a weird box

hi when i apply a gaussian blur to an object it is confined within a box....anyway to fix this?
thanks

Yes in the Document raster effects setting under Effects there is a input filed that says Add (pixel input field) Around Object.
change that to something like 60 pixels or higher the is no preview of it but after hitting ok it will be smoother like the screen shot.
I got it to preview by reopening the dialog after already applying the new setting. The setting is sticky so it looks like it was alsopreviewed.
this tip is thanks to one of Mordy Goldings blogs!

Gaussian Blur issues

I am having dificulty with Gaussian Blur. I created a selection outline in an image and then filled it with black. I then selected Gaussian Blurr from the Filter Menu a set the radius to 100 and then deselected my previous selection. In CS5 the edges faded into the backgroud image however in CS6 the outline of the previous selection was still visible and the Gaussian Blur did not blend the selection as expected. Even ramping the radius up did not solve the issue as the outline still remained visible. how do i resolve this issue in CS6?
Thanks

Thanks for the responses. I was working along with a tutorial (the first screen shot is of the result that was achieved in the tutorial). I made the mistake of leaving the selection in place when I applied the Gaussian Blur and so i got the result shown in the second image. I only realised this after reading your comments and trying it again. Thanks for your help.

Query on Gaussian blur

Hi All,
I have observed one thing. Whenever u add gaussian blur or Radial blur and on dragging slider to change its values, image in the preview appears distorted but still shows effect applying. And on mouse up after the drag, progress bar appears in the bottom and after progress is complete preview becomes smooth. So can anyone tell me
1. What happens while dragging ? Do they reduce the quality of image? If so how can it be done in our custom effect?
Thanks and Regards,
Suma

you could use AEGP_SetCompDownsampleFactor to force the whole comp into lower resolution,
but i don't know what will happen if you do that from a render call.
perhaps you should do that from the USER_CHANGED_PARAM call, but it's getting tricky.
if you want to lower the resolution of your plug-in only,
you could use PF_COPY with a small destination rectangle. (or it's low quality version, which uses a "skip pixel" algorithm)
it's way quicker than transform_world.
and lastly,
there is no way for changing the adaptive resolution state on a comp.
neither through the sdk API, nor through java scripting. (at least to my knowledge)

Gaussian blur-- posterization

Hi all-
In a current project, I'm using some blurring effects through time (either a shot starts off blurry and comes into focus, or the reverse direction). All of the raw footage starts out completely in focus.
I have been using the "Gaussian Blur" effect in FCP, but I'm finding that as the blur amount changes through time, the image gets very posterized (i.e. distinct color bands, rather than gradual color shift), especially if there is motion in the shot that I'm blurring.
Does anyone recommend a way to eliminate the posterization artifacts, or a different effect or plug-in that will accomplish my image blurs with a more natural-lens look and quality?
Thanx gang.
-Chris

Yup, that's it, Jerry.
But in another FCP group, a listserve, I belong to, in a recent thread about 10-bit video in Final Cut, some well respected professionals did some testing. Oliver Peters posted this reply:
OK, I've had a chance to get back to this and ran another test this morning. SD input from DBeta to Kona2 using bars from DBeta tape. Captured bars both as 8-bit and 10-bit
media. Created 5 timelines:
1. 8-bit with 8-bit processing
2. 8-bit with HPYUV processing
3. 10-bit with 10-bit processing
4. 10-bit with HPYUV processing
5. 10-bit with 8-bit processing
Applied 3-way CC to the clips and compared no effect, effect rendered and effect previewed (not rendered). When you leave the CC settings at default, i.e. no adjustments, all timelines and all combinations of rendered, unrendered and no effect match each other on the scopes. (Note, that there was a very slight change on the 8-bit processing in the
10-bit timeline.) However, when you actually change the settings, i.e. apply CC changes, then ALL 10-bit and HPYUV combinations show a shift between rendered and preview of
the effect. The ONLY timeline where there was no change was #1, 8-bit with 8-bit processing. Also the 8-bit within the 10-bit timeline had extremely little change, but of course you take a hit stepping down to 8-bit processing. The changes that I saw were minor luma shifts (mainly in the midrange) and subtle vector shifts.
Quad-core G5 5GB RAM, Aja Io-LA, FCS 5.1 Mac OS X (10.4.6) Lots of toys

Gaussian Blur glitch?

Hey forum, every time I simply change the color of text in Illustrator CS5, the loading bar window appears and says it's working on applying a Gaussian Blur to the text, yet nothing happens after. The text's color changes, but that's all. No Gaussian Blur, nothing. A major annoyance when trying to only change the color of text, especially when one is as indecisive as me... Any simple, easy suggestions? I'm sure I'm overlooking something, but I still have yet to figure out what it is.
Thanks.

I feel your pain, and can only share some additional workarounds
Build effects in photoshop when possible (Drop shadows actually trap better by using a method of 2 files with the drop shadow image set to multiply and a 2nd non-drop shadow image on top set to normal. Photoshop previews appear more accurate on glows/blurs/drop shadows when doing detailed work, even if your Illustrator Doc Raster Effects are set high).
Effects >> Document Raster Effects Settings >> set to 72 dpi temporarily until file release.
Temporarily hide layers with intense effects if you are not working on them
Use outline mode (Command Y) when you have a quick type change as you mentioned

Issue with Gaussian Blur and Spot Colors

Wondering if anyone has a solution to this issue.
Setup: We are using CS4 + CS5 Illustrator on Mac OS 10.5.X and 10.6.X
We created a spot color radial gradient filled circle over a background of the same spot color. The gradient went from 100% of the color down to 2%. We then applied a gaussian blur set to 50 pixels so that we had a nice smooth transition from the circle blurring outwards over the background with the blur blending into the spot color background.
The problem arises when we select "Retain Spot Colors" on the blur. It fills the gradient circle with 100% solid color (but at the 2% range of the gradient so it appears white) and deletes the blur effect. If we don't select "Retain Spot Colors", it converts the blur to process and we get a banding on our printouts where the spot background and CMYK gaussian meet.
We tried the gaussian blur set at 5 pixels all the way up to 55 in 10 pixel increments but nothing worked. We tried different spot colors, same issue. We know we can do the background in Photoshop and import it into Illustrator as a workaround, but we are constantly editing and changing files and would like to keep everything in Illustrator.
Does anyone have any suggestions on how to solve this or if there is even a solution. We have not tried Illustrator 5.5 and do not want to invest the money in the upgrade yet. We would prefer to stay with both CS4 and CS5.
Thank you for any input.

Hi Mike,
Okay, I have some new information that changes things. I misunderstood what the issue was from the designer. My apologies in advance for the confusion. There are actually two issues but they are somewhat related.
Issue 1:
We are concerned with banding on the outside of a spot color gradient with a gaussian blur over a patterned background of the same spot color. We do not know if this is becasue of the number of pixels on the blur, the version of Illustrator, the blending of the blur into the patterned background, etc... While the banding looks slight on screen it is more pronounced when printed. There are many variables and we have tried everything we can think of to create a smooth transition but we keep getting some banding.
The first image shows what happens when the Preserve Spot Colors in the Raster Effects Settings (found under the Effect menu) is unchecked. We believe that the spot color is being treated as CMYK and causing the blur to be a slightly different color than the spot color background thus causing the banding.
The second image shows what happens when we select Preserve Spot Colors. We lose the blur.
The third image is what we are trying to achieve over a over a patterned background of the same spot color. This was achieved with the Preserve Spot Colors unchecked and also unchecking Overprint Preview in the Separations Preview Palette. However, this brings us right back to the issue with the Preserve Spot Color being unchecked.
Issue 2:
The issue is that we want to print a spot color gradient with a gaussian blur (over 50 pixels). In order to preview the blur effect correctly we have to uncheck the Preserve Spot Colors in the Raster Effects Settings (found under the Effect menu). However, we have recently found out that this will not work with the software our printers use to do separations. If we check the Preserve Spot Color for the separator, it turns the blur into a large square of color (see screensnap below). We have played around with the Add: x Around Object setting in Raster Effects but it has not helped.
3. If we do not select "Preserve Spot Color", the blur looks correct but it is no longer a spot color but CMYK when separated.
I hope that isn't too confusing and makes sense. Again, apologies for the mixup on my part originally. Thanks again for any help.

GPU-version of Gaussian Blur sometimes produces visible ringing artifacts on high contrast images

Hi,
I noticed some annoying ringing artifacts in my footage after applying the GaussianBlur() from the PrSDKGPUImageProcessingSuite.
I assume the blur implementation is the same as in the 'Gaussian Blur' Video Effect. So I tested with that effect standalone and was able reproduce the problem.
The ringing artifacts appear in high contrasted footage (see screenshots) and only with the GPU-version of the blur.
Switching to software-only renderer and therefore enforcing the CPU-version of the effect removes the artifacts.
Has anybody already noticed this issue?
Regards,
Philipp
Gaussian Blur (CPU) without artifacts:
Gaussian Blur (GPU) with artifacts:

The "blocky" details are easily reproduced in that image. Looks like something that needs to be tuned up to me.
Note that you have the option of choosing the 2003 process in Camera Raw, which appears to avoid that issue.
I just want to add one thing: There's no upsampled resolution available for this particular camera. 6048 x 4032 is the largest size available. I for one prefer to convert my raw files directly to upsampled resolutions on the theory that it might improve this kind of thing (and it does seem to deliever more accurate detail with my now out-of-date Canon cameras). At some point in the past I requested that Camera Raw make several upsampled resolutions available beyond the "native" camera size for any/all cameras. I hereby renew that request.
-Noel

Banding after applying Gaussian blur

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