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Help w/selection Despeckle/Gaussian/Sharp

Feb 20, 2014, 00:25 (This post was last modified: Feb 21, 2014 03:03 by Technorain.)
Post: #1
Question Help w/selection Despeckle/Gaussian/Sharp
Utilizing some of the advanced filters I'm down to the methods here

http://gimpguru.org/Tutorials/ReducingCCDNoise/


Trying to take this rough image and smooth out the lines at the top and the bottom that show up like looking like ripples in sand on my phone. Otherwise it looks sharp.

However the samples noted in the gimpguru demo with the baby are mostly biased towards heavy white and also very patterned straight lines/boundaries whereas i'm working with a balanced very white and very black inky image so what are some options here?


http://i901.photobucket.com/albums/ac219...67aaf1.jpg

tia
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Feb 20, 2014, 07:36
Post: #2
RE: Help w/selection Despeckle/Gaussian/Sharp
There are limits with despeckle.

I like the results of custom selectied selective blur, its a stronger version of blur that can preserve edges (in some cases) & prevent colors from bleeding into eachother.

Compare it with guassian blur & you'll see what I mean.

1. First make a loose selection around the area that you want to smooth the grain / noise using either of these selection tools Ellipseselect, Freeselect, Rectselect, Iscissors, Foregroundselect, or using the quick mask & erasing the part you want to select(disable the quick mask after you erase the part you want selected fully)

-A loose selection so you can see how it blends with the rest of the image in the preview window.

2. Go to
Filters > Blurs > Selective blur
The image below is the settings I used, but it will be a little different with the brightness in your photo, so experiment, start from low value for both "Max delta" and "blur radius" to find the best look.

I scaled down & brightened the image to exaggerate the final effect.

(Click thumbnail for important details)
[Image: x9EW8VZs.jpg]

End result side by side comparison
   

"In order to succeed, your desire for success should be greater than fear of failure." BC
[Image: 29uocaf.png]
iFS007 tut vids on YT ~ auto color B&W landscape tut
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Feb 21, 2014, 00:53
Post: #3
Question RE: Help w/selection Despeckle/Gaussian/Sharp
Hello, and thanks for the input

When I work with the topmost portion I am running into something interesting as it pertains to the color pool and the tools you mentioned.

The problem in particular is that of the uppermost portion of the photo, the RGB pool is rather limited and as expected the mediation and blurring adherres to this spectrum.

I think that a much smoother cast to the eye (and any digital display) from the top of the photo moving down (pulling more blues) would actually blur with richer/more color fidelity because that would introduce more color bands to the blurring region, and help me to glance off the bright contrasts that are causing the easy-to-see bands.

But How would I do that uniformly and discretely?
Colorbalance
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Feb 21, 2014, 03:02
Post: #4
RE: Help w/selection Despeckle/Gaussian/Sharp
First, can we please have a mod change the huge images in both threads to a link or thumbnail? its huge & wasting page space :\

Second,
With your original image or the image in current color band state:

re-select the top part, copy it onto a new layer for better blending

- Edit > Copy
- Edit > Paste as > New Layer...

Then try the color channels on "Colors > Curves"

Then click the pull-down "Channel:" & pick blue channel.

A small vertical motion blur "Filters > Motion blur (linear blur)" can also hide/better blend the bands if you make a loose selection at the top. (adjust the "direction" untill it blurs upwards or downwards)


If the colors bleed, undo the motion blur & try another selective blur to the point that the bands are less noticeable.

Then follow up with "Filters > Enhance > Unsharp mask" a bit.

If there is a hard edge at the bottom of the new layer after applying the blur & color channels,
(Temporarily disable the layer boundary "View > Layer boundary" to see the edge)
you can add a layer mask with a gradient blend Blend to blend the bottom half.

1. Right-click on the new layer you made with all the filters applied, then click on "Add layer mask"
- You will see two boxes on the layer in the layers window
[image][mask]
- When you apply the Blend gradient, pick "FG to BG" the colors should be default:
(Black=foreground, White=Background)
-You should see gradient in the "[mask]" part and you will see a smooth line where the hard edge was if you draw from bottom up,
===========
Yet one more way to use the layer mask to blend the layer with the rest of the image:
http://youtu.be/iHkIXVFchyM?t=1m53s
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Feb 21, 2014, 03:09 (This post was last modified: Feb 21, 2014 03:10 by Technorain.)
Post: #5
RE: Help w/selection Despeckle/Gaussian/Sharp
I happened to be here so I just flipped it to the link.

To pull in the darks I wanted easily with the layers method I used a technique found here:
http://www.photoshopessentials.com/photo...oshop-sky/

Black from the top down and actually from the bottom up clears up both problems and then the methods you posted neatly finishes the job where black is too heavy handed at the bottom creating a blob.

I'll post my finished work later for memory and to make sure the forum has it.

Thanks bud.

TR.
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Feb 21, 2014, 03:36
Post: #6
RE: Help w/selection Despeckle/Gaussian/Sharp
(Feb 21, 2014 03:09)Technorain Wrote:  ...
To pull in the darks I wanted easily with the layers method I used a technique found here:
http://www.photoshopessentials.com/photo...oshop-sky/
...
l post my finished work later for memory and to make sure the forum has it.

Thanks bud.

TR.

Gimp is not photoshop, so for the most part that method MIGHT work, but creating a layer mask in Gimp is a little differen't
Please see here for a good exanple / visual : http://gimpforums.com/thread-paint-away-...8#pid25728

Looking foward to the end result Smile , if you post it here, please try to link using the hyperlink or a thumbnail image.
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Feb 21, 2014, 08:23 (This post was last modified: Feb 21, 2014 08:25 by Technorain.)
Post: #7
RE: Help w/selection Despeckle/Gaussian/Sharp
The end result is actually a quite simpler approach with Gimp after all but gleaned from all of the tools listed above plus playing with blend tools numbers to apply the blue and black masks to whole regions in order to look normalized.

- >> Rectangle region I selected the bottom from the first dark row down and for the sky from the highest bright star.
- >> Blend Tool / Opacity 10-50 / Dithering / Adaptive 2 -- .5ish

Sample
[Image: 4ab3b3bd-2c5d-4fc2-b36a-04ed96e18ef9_zps5086abbb.png]

Phone Screen
http://i901.photobucket.com/albums/ac219...5754b1.png

Full Screen Final
http://i901.photobucket.com/albums/ac219...7d7d69.png
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Feb 22, 2014, 09:34 (This post was last modified: Feb 22, 2014 09:43 by iForStyle007.)
Post: #8
Thumbs Up RE: Help w/selection Despeckle/Gaussian/Sharp
^_^ Looks great!
When I want to hide outlines on objects sometimes I'll make a gradient dropshadow with a small blur radius, if you make the dropshadow color to the background, it blends well & you won't notice the jagged edge much.
I have an example on here somewhere, if I ever find it I'll try to link you to it.

^_^ Found it, you can see the jagged feathers are blended with the shadow in the "after photo:
http://gimpforums.com/thread-fading-blen...8#pid22668
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