[Gimp-user] Re: retouching dark photos

[Pasi Savolainen]

* 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.

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.

-- 
   Psi -- 

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

[Steven Woody]

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?

-- 
steven woody (id: narke)

Stills Photographer: You know double-O-7?
Bob: He drinks martinis, but all right. 

- Lost in Translation (2003)

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[Gimp-user] Re: retouching dark photos

[Pasi Savolainen]

* 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.


-- 
   Psi -- 

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Re: [Gimp-user] retouching dark photos

[Steven Woody]

Raphaël Quinet <[EMAIL PROTECTED]> writes:

> 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.
>
> In the Levels dialog, try moving the left handle (the black one) to
> the right.  Try moving the middle one as well.  The preview will
> allow you to see what happens and should help you to find the best
> values for correcting your pictures.  The "Auto" button can give
> interesting results, but can also introduce color casts so maybe
> you should experiment first with manual adjustments.
>
> 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?

>
> -Raphaël
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>

-- 
steven woody (id: narke)

Kiss me. Kiss me as if it were the last time.

- Casablanca (1942)

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[Gimp-user] bug hunting binaries for Fedora Core 4

[Ben Liblit]

The Cooperative Bug Isolation Project is a joint effort by the
University of Wisconsin-Madison, UC Berkeley, and Stanford University to
bring debugging into the Internet age.  Instrumented applications send
feedback to our analysis center, where we use statistical debugging
techniques to learn what goes wrong when the software crashes.

CBI is pleased to announce that prebuilt, instrumented binaries of The
GIMP are now available as ready-to-install RPMs for Fedora Core 4.  We
track stable releases, currently 2.2.8.  Several other applications are
available as well; see the download page for details.

What we need most of all are more runs from real users like you!  Even
if you've never written a line of code in your life, you can help make
things better for everyone simply by using our special bug-hunting
packages.  Read more (http://www.cs.wisc.edu/cbi/), download some
packages (http://www.cs.wisc.edu/cbi/downloads/), and join in!

Fedora Core 1 and Fedora Core 2 users can help too: see the CBI
downloads page for selected versions of most instrumented applications
for FC1 and FC2.

project info: 
downloads:



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Re: [Gimp-user] retouching dark photos

[Rikard Johnels]

On Friday 05 August 2005 19.37, Sven Neumann wrote:
> Hi,
>
> Roger D Vargas <[EMAIL PROTECTED]> writes:
> > 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.
>
> Try using the Levels tool instead. Just play with it for a while and
> perhaps use the Help button. You might find the color pickers useful.
>
>
> Sven
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I sometimes use a copy of the image added to the original.
Test the following (in Gimp 2.2.8 anyhow)

Start Gimp.
Open the picture which you want to lighten.
Make a copy (right klick on the image -> Layer -> Duplicate layer)
In the layer window: "Layers Mode" set to "Screen" instead of "Normal".
That lightens the image some. Just redo the steps above for even brighter 
images.
Its a fast way to brighten things up without having to play with values.

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

[Raphaël Quinet]

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.

In the Levels dialog, try moving the left handle (the black one) to
the right.  Try moving the middle one as well.  The preview will
allow you to see what happens and should help you to find the best
values for correcting your pictures.  The "Auto" button can give
interesting results, but can also introduce color casts so maybe
you should experiment first with manual adjustments.

See also: http://gimp-savvy.com/BOOK/index.html?node60.html

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

[Sven Neumann]

Hi,

Roger D Vargas <[EMAIL PROTECTED]> writes:

> 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.

Try using the Levels tool instead. Just play with it for a while and
perhaps use the Help button. You might find the color pickers useful.


Sven
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[Gimp-user] retouching dark photos

[Roger D Vargas]

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.


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


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