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Best image treatment

Jan 2, 2012, 19:36
Post: #1
Best image treatment
Hello,

I have 3 images which I am looking for the best treatment. I would appreciate any tip!

a) Dark hair: the woman has an dark hair which is almost blended with the background. What to do to bring more definition to hair and to “separate” it from background?

b) Face light: one side of the man face (and body) is with much brightness, blending with his white shirt yet. Is there any way do correct it?

c) Spot of light: in a slice of a landscape there is a spot with much clarity/brightness. I would prefer to bring more blue from the sky then light. On the other hand, maybe there is any way to take benefit of the light, I am not sure… Any suggestion about how to improve this one?

Thanks in advance indeed. Amazing ideas in this New Year for everybody!!!

Cadu


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Jan 2, 2012, 22:11
Post: #2
RE: Best image treatment
My suggestions:
(Jan 2, 2012 19:36)cadu Wrote:  a) Dark hair: the woman has an dark hair which is almost blended with the background. What to do to bring more definition to hair and to “separate” it from background?
Don't touch the hair. Lighten the background. Free-hand select the background, add layer, fill selection with medium gray, put in divide mode, adjust with opacity slider. This may create some squarish areas but you can also blur that background.

(Jan 2, 2012 19:36)cadu Wrote:  b) Face light: one side of the man face (and body) is with much brightness, blending with his white shirt yet. Is there any way do correct it?
Use the color picker with "sample average" and pick the color on the other cheek. Add a transparent layer. Put in "Soft light" or "Overlay" mode. Airbrush the cheek. Don't overdo it. The effect is rather subtle, but IMHO that's all that is needed.

(Jan 2, 2012 19:36)cadu Wrote:  c) Spot of light: in a slice of a landscape there is a spot with much clarity/brightness. I would prefer to bring more blue from the sky then light. On the other hand, maybe there is any way to take benefit of the light, I am not sure… Any suggestion about how to improve this one?
Not much hope to extract a proper blue from that. However it's quit easy to graft a sky: make a rough selection (Freehand select) to include all that area (including any holes in foliage), then "Colors/Color to alpha (and keep white at the reference color). This will make all the "sky" there transparent, and you can insert a sky blue layer below (this also makes visible a pattern of diagonal stripes... was the original photo tilted?)?

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Jan 3, 2012, 15:37
Post: #3
RE: Best image treatment
Hi Ofnuts! I am new in Gimp and these were great tips to improve my software usage!!! All tips fit perfectly what I needed. Many many thanks!!!

Bellow there are some further comments/questions. I would appreciate your help to conclude my learning about this subject. Take your time, I am not hurry, but with much curiosity about using Gimp in better way!!!

a) Dark hair: using “divide mode” I could achieve better result than blurring.

a.1) When I selected and filled selection with gray it was created a new layer with just the gray selection in a transparent background. But when using blur, I need to apply the effect direct to the image, isn’t it? In other words, using “divide mode” I need to handle 2 layers. Using “blur” I need to handle just 1 layer (the original image), isn’t it?

a.2) About blurring, I tried “filters=> blur”. Considering the available blur filters, which is the best to be applied in this situation?

a.3) And after I have worked with gray in “divide mode” and created 2 layers, is there any “final” filter (or treatment) to be applied to bring more naturally to the whole image? The idea is decrease likelihood of the image seems to be artificially created.

a.4) Is there any way to save the selection I made in the background to be applied in other situations? In this case, I experimented “gray in divide mode” and “blur”. I had to make 2 selections, once for each treatment I began from original image. It would be useful…

a.5) May you give me “simple” explanation about main usage of “divide layer mode”. I saw its utility by myself, but I would like to know broader application to my future usage…

b) Face light: everything worked great. Just some detail:

b.1) In this situation, is it better to configure “color picker” with smaller or bigger radius (in sample average)?

b.2) I couldn’t see difference using "Soft light" or "Overlay" mode. Both gave me very closer result (I would say same...). Is there any specific application to each of them?

b.3) As in the former question, after modifying image, is there any “final” filter (or treatment) to be applied to bring more naturally to the whole image?

c) Spot of light: I cound’t imagine this is possible! IMHO it improved the original picture which the sky bright wasn’t good. I attached the new one. Just the girl upper was moving and suggested some tilt in first image I sent. I couldn’t see pattern of diagonal stripes you mentioned…

c.1) As in the former question, after modifying image, is there any “final” filter (or treatment) to be applied to bring more naturally to the whole image?

c.2) Would you suggest any other treatment to improve this image? After I have inserted blue sky I just adjusted color levels, once in first image the sky was the brightest color and now I think are the white shirts.

Best,
Cadu


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Jan 3, 2012, 17:32
Post: #4
RE: Best image treatment
(Jan 3, 2012 15:37)cadu Wrote:  Hi Ofnuts! I am new in Gimp and these were great tips to improve my software usage!!! All tips fit perfectly what I needed. Many many thanks!!!

Bellow there are some further comments/questions. I would appreciate your help to conclude my learning about this subject. Take your time, I am not hurry, but with much curiosity about using Gimp in better way!!!

a) Dark hair: using “divide mode” I could achieve better result than blurring.

a.1) When I selected and filled selection with gray it was created a new layer with just the gray selection in a transparent background. But when using blur, I need to apply the effect direct to the image, isn’t it? In other words, using “divide mode” I need to handle 2 layers. Using “blur” I need to handle just 1 layer (the original image), isn’t it?

a.2) About blurring, I tried “filters=> blur”. Considering the available blur filters, which is the best to be applied in this situation?

a.3) And after I have worked with gray in “divide mode” and created 2 layers, is there any “final” filter (or treatment) to be applied to bring more naturally to the whole image? The idea is decrease likelihood of the image seems to be artificially created.

a.4) Is there any way to save the selection I made in the background to be applied in other situations? In this case, I experimented “gray in divide mode” and “blur”. I had to make 2 selections, once for each treatment I began from original image. It would be useful…

a.5) May you give me “simple” explanation about main usage of “divide layer mode”. I saw its utility by myself, but I would like to know broader application to my future usage…
a) It's divide *and* blur. The problem with divide mode is that the background uses a small set of values... when you "divide it", you still get as many values, but you increase the gap between them, so you lose the natural fade from one tone to another. The intent of the blur os to recover some of the fading.

a1) right. Divide is betwen two layers, blur is on the original image, or better, do the divide, merge the layers,and apply blur to the result.

a2) the best one is Gaussian blur. But the plain blur may just be a Gaussian one under the covers.

a3) beyond the blur, none I know of.

a4) "Select/Save to channel" and to restore, in the Channels dialog, , right click and "Channel to selection" (you can also combine a saved selection mask with the current one, using other choices in the right click menu).

a5) Divide mode is very mathematical. Conceptually, the RGB values from 0 to 255 (in both layers) are mapped to the interval [0,1]. Then the lower layer is divided by the upper one, so if the upper one has RGB values of 127 (ie, 0.5), the resulting values are those of the bottom layer multiplied by 2 so this tends to lighten the pixels (and as you guess, the "multiply" mode works the other way). Dividing by a color drags the tones to its complementary color: for instance, dividing by (255,128,128) tints the image with (128,255,255).

(Jan 3, 2012 15:37)cadu Wrote:  b) Face light: everything worked great. Just some detail:

b.1) In this situation, is it better to configure “color picker” with smaller or bigger radius (in sample average)?

b.2) I couldn’t see difference using "Soft light" or "Overlay" mode. Both gave me very closer result (I would say same...). Is there any specific application to each of them?

b.3) As in the former question, after modifying image, is there any “final” filter (or treatment) to be applied to bring more naturally to the whole image?
b1) Make it wide enough to avoid a bias due skin irregularities

b2) Couldn't see much difference either Smile According to http://docs.gimp.org/en/gimp-concepts-layer-modes.html they can even be identical in some Gimp versions. "Soft light" may be a bit softer.

(Jan 3, 2012 15:37)cadu Wrote:  c) Spot of light: I cound’t imagine this is possible! IMHO it improved the original picture which the sky bright wasn’t good. I attached the new one. Just the girl upper was moving and suggested some tilt in first image I sent. I couldn’t see pattern of diagonal stripes you mentioned…

c.1) As in the former question, after modifying image, is there any “final” filter (or treatment) to be applied to bring more naturally to the whole image?

c.2) Would you suggest any other treatment to improve this image? After I have inserted blue sky I just adjusted color levels, once in first image the sky was the brightest color and now I think are the white shirts.
c1) You can try a bit of "Filter/enhance/unsharp mask", which, despite its name, really sharpens the image. I tend to use a small radius (around one) and a small amount (around one, too). Look carefully at the image afterwards and look for grain that way appear in what was even areas (the shirts, for instance). If so increase the threshold a bit. As always, don't overdo it (besides noise grain, watch for halos near high-contrast edges.

c2) yes, the guy's white shirt is a bit-over exposed, but there is not much you can do about it. Better leave it alone.

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Jan 3, 2012, 18:30
Post: #5
RE: Best image treatment
Hi Ofnuts! Great explanations. I am using Gimp along a couple of days and after that I improved a lot. Thanks for your promptness on answer me.

a1) "merge the layers,and apply blur to the result"
Are you referring to the simple blur filter? It seems obvious, but to achieve the results with the blur (and other filters/tolls) is it necessary to merge layers? In other words, after finish a work using layers the "finalization" is to merge all of them, isn't it?

a4) "Select/Save to channel" and to restore, in the Channels dialog, , right click and "Channel to selection"
I could do it in same image. When I tried to use the selection saved from one image in another, the selection doesn't appear in the "channels dialog" of the other image. Is there any way to handle saved selections between different images?

Best,
Cadu
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Jan 3, 2012, 21:10
Post: #6
RE: Best image treatment
(Jan 3, 2012 18:30)cadu Wrote:  Hi Ofnuts! Great explanations. I am using Gimp along a couple of days and after that I improved a lot. Thanks for your promptness on answer me.

a1) "merge the layers,and apply blur to the result"
Are you referring to the simple blur filter? It seems obvious, but to achieve the results with the blur (and other filters/tolls) is it necessary to merge layers? In other words, after finish a work using layers the "finalization" is to merge all of them, isn't it?

a4) "Select/Save to channel" and to restore, in the Channels dialog, , right click and "Channel to selection"
I could do it in same image. When I tried to use the selection saved from one image in another, the selection doesn't appear in the "channels dialog" of the other image. Is there any way to handle saved selections between different images?
a1) In that case, the blur (Gaussian, because you can tune it a bit more) is best applied after merging the layers, to cancel the posterization" that appeared when lighting up the background. But I won't make it a general rule, every picture is a different problem, and thus requires a different solution.

a4) Yes, within the same image it is easy. Across images is a bit harder, but it can be done: see http://gimpforums.com/thread-copying-a-s...oss-images (hot from the press Smile)

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Jan 3, 2012, 21:38
Post: #7
RE: Best image treatment
Great ofnuts!!!
Gimp seems to be really full-featured...
Everything is understood.
Thanks for the classes!!!
Cadu
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