[Gimp-user] Compiling refocus

[Don Rozenberg]

Hi,

I hope that this is going to the correct place, i.e, response to 
"Compiling refocus".


When I went to Gimp 2.2.6, I found that refocus would not compile.  
There were name clashes between the preview code in refocus and the Gimp 
preview code.  I modified refocus so that it would compile.  My modified 
code and discussion can be found at html://page.sourceforge.net.  The 
url for the tar file is 
http://page.sourceforge.net/refocus-0.9.0_gimp2_rozen.tgz


I hope that this helps.

Don

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Re: [Gimp-user] Re: retouching dark photos

[Steven Woody]

Pasi Savolainen <[EMAIL PROTECTED]> writes:

> * Steven Woody <[EMAIL PROTECTED]>:
>> Pasi Savolainen <[EMAIL PROTECTED]> writes:
 when i worked on individul channels, i always got color cast. i just can 
 not
 image that how people working on channels can still keep color balance well
 sicne you can not do the r,g,b simultanously. any tips there?
>>>
>>> This depends heavily on the image that's worked on.
>>> Generally I'd say procedure is to go through r,g,b and adjust only black
>>> and white point, leaving gamma (middle number) as it is. Most images
>>> have about linear channels, only shifted+compressed in some way, so this
>>> will get you mostly castless image (again, this is very taste-specific
>>> operation and some people, of which I may be one, just don't see much
>>> difference in some shades). When image has cast that I notice, I start
>>> working with gamma sliders and try to achieve something that look a bit
>>> like the anticolor of the cast.
>>> For example if cast is blue, go to blue color and move gamma to the
>>> right, making it smaller (the colorstrip will turn yellow). In case of
>>> yellow cast one would move it to the left. etc.
>>> Often after one cast is removed, another creeps up, so this is a game of
>>> balance.
>>> Turning preview on/off helps a lot, as does having a ->Duplicate
>>> around at all times.
>>
>> i think you were talking about level tool, did you mean you will not prefer
>> curve tool?
>
> This all is doable trough curves tool, it's just that I'm used to only
> correcting contrast in curves. It's also not that long that curves tool
> didn't have channel histogram visible, so adjusting black/white wasn't
> as 'precise'.

> If I understand correctly, 'Gamma' on Levels is same as if you add
> control point in the centre of Curves tool and move it up/down.

i think so.

>
>>> Using color pickers and choosing black/grey/white colors from _really_
>>> black grey and white spots will likely get you into a good start. They
>>> just tend to clip whites/blacks too much, losing detail that way.
>>
>> okay, i got your point about using the black/white point in the picture to 
>> set
>> the relative ends of level tool. but how you use grey?

> color pickers should be used in 'Value' channel, grey estimates relative
> balance of channels, which is too strong, which is too weak. For example
> if you click on color RGB(120, 130, 90), it will (likely) boost blue and
> dampen green channel so that they will become rgb(120,120,120) where you
> clicked. 

thank you, i've got the point.

more interesting, in the levels window, if i pick a point p1 as grey using grey
picker, then pick another point p2 as another grey point. in this case, what
gimp will do? i think there are two candidates,

1, do adjust to make p1 grey, and from that point on do another adjust to make
p2 grey. the result will be: p1 and p2 are both natural grey.

2, as if user did not click p1, gimp adjust p2 from scratch and simply forgot
what he did before.

which one above is the answer?



> (this depends on how exactly GIMP decides the value that it
> tries to reach, the main point is that it will become similar across
> channels by adjusting gamma of individual channels).
>
>
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Re: [Gimp-user] Re: scissors selection tool

[Michael Schumacher]

Michel Franckart wrote:
> Sven Neumann  gimp.org> writes:

>>Suggestions on how to improve this are welcome. Patches would be even
>>more appreciated.

> I use Gimp 224 on SuSe Linux 92 :turning a scissor-made shape into a selection
> rarely works and never twice.
> I have tries several 'tricks' suggested in mailing lists : they do not work.

Hm, somehow this misses the point of what Sven was asking for...


Michael

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[Gimp-user] Re: scissors selection tool

[GSR - FR]

Hi,
[EMAIL PROTECTED] (2005-08-06 at 2050.09 +):
> I use Gimp 224 on SuSe Linux 92 :turning a scissor-made shape into a selection
> rarely works and never twice.
> I have tries several 'tricks' suggested in mailing lists : they do not work.
> Michel

The original concept (or the second version based in date) can be seen here
http://web.engr.oregonstate.edu/~enm/publications/CVPR_99/toboggan_scissors.mov
Obviously GIMP has a different interface, and maybe even algorithm
varies slightly or has not been improved.

GSR
 
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[Gimp-user] Re: scissors selection tool

[Michel Franckart]

Sven Neumann  gimp.org> writes:

> 
> Hi,
> 
> Steve Stavropoulos  gmail.com> writes:
> 
> > On 7/27/05, Rachelle McLean wrote:
> >> With the selection tool that looks like a pair of scissors, and
> >> acts lilke the magnetic lasso tool in Photoshop, I can get it to
> >> make a shape but how do you turn the shape with the points into a
> >> selection?
> >> 
> >
> >  First you have to close the shape. Your last point should be on top
> > of the first one. Then, you click inside your shape and it turns into
> > a selection.
> 
> Suggestions on how to improve this are welcome. Patches would be even
> more appreciated.
> 
> Sven
> 

Hi.
I use Gimp 224 on SuSe Linux 92 :turning a scissor-made shape into a selection
rarely works and never twice.
I have tries several 'tricks' suggested in mailing lists : they do not work.
Michel

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Re: [Gimp-user] retouching dark photos

[sam ende]

On Saturday 06 August 2005 22:10, Andrew Robinson wrote:

> Wish I knew how to work the curves. Any recommend a good tutorial?

i've not worked that one out at all, have no idea what it's supposed to 
do. my first step is pretty much like yours -try the simplest method 
first which in my case would be to adjust brightness and contrast and 
then to look at colour balance, both under the layers/colours menu. i 
then may use the levels tool which allows you adjust alpha and the rgb 
channels in parts of the image rather than the whole image.

sammi
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Re: [Gimp-user] retouching dark photos

[Roger D Vargas]

Raphaël Quinet wrote:

On Fri, 05 Aug 2005 13:16:28 -0400, Roger D Vargas <[EMAIL PROTECTED]> wrote:

First of all, Im a total newbie in image management. I have made just 
some simple things with Gimp. I have some pictures I took with low 
lights, and I would like to know the correct method to improve it. Right 
now Im using Brigth and contrast to increase bright.



There is no single method that works perfectly in all cases, but
you can try ->Layers->Colors->Levels or ...->Curves.
Thanks, I found curves give better result than increasing bright. Levels 
give a very similar effect.

--
Roger D. Vargas
http://dsgp.blogspot.com | Linux, programación, juegos


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Re: [Gimp-user] retouching dark photos

[Andrew Robinson]

Steven Woody wrote:
>
> when playing with level or curves, did you guys adjust each channel 
alone or

> the overall combined value?

I'm no expert, but I usually start with the easiest operation and work 
my way to the more difficult. I'll try Auto-Levels first, adjusting the 
brightness with the middle triangle. If I don't like that, which is 
probable with a dark image, I'll undo it and adjust the white and black 
points on the combined channel. If that leaves a color cast, I'll adjust

individual channels.

Wish I knew how to work the curves. Any recommend a good tutorial?

Andrew Robinson

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[Gimp-user] Re: retouching dark photos

[Pasi Savolainen]

* Steven Woody <[EMAIL PROTECTED]>:
> Pasi Savolainen <[EMAIL PROTECTED]> writes:
>>> when i worked on individul channels, i always got color cast. i just can not
>>> image that how people working on channels can still keep color balance well
>>> sicne you can not do the r,g,b simultanously. any tips there?
>>
>> This depends heavily on the image that's worked on.
>> Generally I'd say procedure is to go through r,g,b and adjust only black
>> and white point, leaving gamma (middle number) as it is. Most images
>> have about linear channels, only shifted+compressed in some way, so this
>> will get you mostly castless image (again, this is very taste-specific
>> operation and some people, of which I may be one, just don't see much
>> difference in some shades). When image has cast that I notice, I start
>> working with gamma sliders and try to achieve something that look a bit
>> like the anticolor of the cast.
>> For example if cast is blue, go to blue color and move gamma to the
>> right, making it smaller (the colorstrip will turn yellow). In case of
>> yellow cast one would move it to the left. etc.
>> Often after one cast is removed, another creeps up, so this is a game of
>> balance.
>> Turning preview on/off helps a lot, as does having a ->Duplicate
>> around at all times.
>
> i think you were talking about level tool, did you mean you will not prefer
> curve tool?

This all is doable trough curves tool, it's just that I'm used to only
correcting contrast in curves. It's also not that long that curves tool
didn't have channel histogram visible, so adjusting black/white wasn't
as 'precise'.
If I understand correctly, 'Gamma' on Levels is same as if you add
control point in the centre of Curves tool and move it up/down.

>> Using color pickers and choosing black/grey/white colors from _really_
>> black grey and white spots will likely get you into a good start. They
>> just tend to clip whites/blacks too much, losing detail that way.
>
> okay, i got your point about using the black/white point in the picture to set
> the relative ends of level tool. but how you use grey?

color pickers should be used in 'Value' channel, grey estimates relative
balance of channels, which is too strong, which is too weak. For example
if you click on color RGB(120, 130, 90), it will (likely) boost blue and
dampen green channel so that they will become rgb(120,120,120) where you
clicked. (this depends on how exactly GIMP decides the value that it
tries to reach, the main point is that it will become similar across
channels by adjusting gamma of individual channels).


-- 
   Psi -- 

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Re: [Gimp-user] Re: retouching dark photos

[Steven Woody]

Sven Neumann <[EMAIL PROTECTED]> writes:

> Hi,
>
> Steven Woody <[EMAIL PROTECTED]> writes:
>
>> okay, i got your point about using the black/white point in the
>> picture to set the relative ends of level tool. but how you use
>> grey?
>
> The grey color picker helps you to remove color casts from your image.
> Pick from a spot that is supposed to have a neutral color. It doesn't
> have to be 50% gray, but it should be some level of gray. This will
> adjust the gamma values of the individual color channels in a way that
> will correct for the color cast.
>
> Sven
>

thank you, i forgot there is a grey picker. BTW, i want to know when you do all
of these, are you in 'value' channel or in r/g/b channel respectively?

-- 
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Re: [Gimp-user] Re: retouching dark photos

[Sven Neumann]

Hi,

Steven Woody <[EMAIL PROTECTED]> writes:

> okay, i got your point about using the black/white point in the
> picture to set the relative ends of level tool. but how you use
> grey?

The grey color picker helps you to remove color casts from your image.
Pick from a spot that is supposed to have a neutral color. It doesn't
have to be 50% gray, but it should be some level of gray. This will
adjust the gamma values of the individual color channels in a way that
will correct for the color cast.

Sven
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Re: [Gimp-user] Re: retouching dark photos

[Steven Woody]

Pasi Savolainen <[EMAIL PROTECTED]> writes:

> * Steven Woody <[EMAIL PROTECTED]>:
>> Pasi Savolainen <[EMAIL PROTECTED]> writes:
>>
>>> * Steven Woody <[EMAIL PROTECTED]>:
> See also: http://gimp-savvy.com/BOOK/index.html?node60.html

 when playing with level or curves, did you guys adjust each channel alone 
 or
 the overall combined value?
>>>
>>> I often take them by channel. It really depends on how well your source
>>> adjust image per-channel. My digicam, being pre-2000, tends to make blue
>>> channel too weak, so it's 'white' point is much lower than red&blue.
>>>
>>> I can't really tell if operating on 'grand total' would produce same
>>> result, it is a matter of convenience of knowing what is happening that
>>> I'm after.
>>>
>>
>> when i worked on individul channels, i always got color cast. i just can not
>> image that how people working on channels can still keep color balance well
>> sicne you can not do the r,g,b simultanously. any tips there?
>
> This depends heavily on the image that's worked on.
> Generally I'd say procedure is to go through r,g,b and adjust only black
> and white point, leaving gamma (middle number) as it is. Most images
> have about linear channels, only shifted+compressed in some way, so this
> will get you mostly castless image (again, this is very taste-specific
> operation and some people, of which I may be one, just don't see much
> difference in some shades). When image has cast that I notice, I start
> working with gamma sliders and try to achieve something that look a bit
> like the anticolor of the cast.
> For example if cast is blue, go to blue color and move gamma to the
> right, making it smaller (the colorstrip will turn yellow). In case of
> yellow cast one would move it to the left. etc.
> Often after one cast is removed, another creeps up, so this is a game of
> balance.
> Turning preview on/off helps a lot, as does having a ->Duplicate
> around at all times.

i think you were talking about level tool, did you mean you will not prefer
curve tool?

>
> Using color pickers and choosing black/grey/white colors from _really_
> black grey and white spots will likely get you into a good start. They
> just tend to clip whites/blacks too much, losing detail that way.

okay, i got your point about using the black/white point in the picture to set
the relative ends of level tool. but how you use grey?

>
> -- 
>Psi -- 
>
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-- 
steven woody (id: narke)

Virginia Woolf: You cannot find peace by avoiding life, Leonard.

- The Hours (2002)

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