Re: [Gimp-user] galen rowell filter?

2007-08-06 Thread David Hodson
David Gowers wrote:

 If you're using a digital camera: Maybe if you use RAW format.
 otherwise: no, by the time you have scanned in the film it is already
 too late (GR filter effects the perception of the camera)

True, but there are workarounds...

If the scene is relatively static (like a landscape), try taking a 
couple of shots at different exposures (one for the sky, one for the 
ground) and combine them in Gimp.


-- 
David Hodson  --  this night wounds time
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Re: [Gimp-user] galen rowell filter?

2007-08-05 Thread David Gowers
On 8/6/07, Rei Shinozuka [EMAIL PROTECTED] wrote:
 is there a (relatively) simple way to add a galen rowell filter.
 that's the late national geographic photographer to made great use
 out of graduated color filters to bring out the colors in sunset,
 etc.

If you're using a digital camera: Maybe if you use RAW format.
otherwise: no, by the time you have scanned in the film it is already
too late (GR filter effects the perception of the camera)

Anyway, it's probably better to use an HDR tool rather than GIMP,
since GIMP is currently limited to 8bit and so isn't a very good
choice for manipulating RAW images.


 these sky colors are often become washed out due to overexposure
 necessary to expose the darked earth-based objects.

 thanks,

 -rei

 --
 Rei Shinozuka [EMAIL PROTECTED]
 Ridgewood, New Jersey

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Re: [Gimp-user] galen rowell filter?

2007-08-05 Thread Akkana Peck
 On 8/6/07, Rei Shinozuka [EMAIL PROTECTED] wrote:
  is there a (relatively) simple way to add a galen rowell filter.
  that's the late national geographic photographer to made great use
  out of graduated color filters to bring out the colors in sunset,

David Gowers writes:
 otherwise: no, by the time you have scanned in the film it is already
 too late (GR filter effects the perception of the camera)
 
 Anyway, it's probably better to use an HDR tool rather than GIMP,

Sure, that's probably better; but with a lot of images you can bring
out much more vibrant color simply by using tools like brightness/
contrast, levels or curves, or by overlaying the image with itself
and playing with layer modes.

So to get a graduated filter effect, try making a duplicate layer
with a layer mask, then draw a black/white gradient on the layer
mask. Then you can operate on just the sky part using the various
brightness tools.

You could also use a graduated selection (e.g. draw a gradient on
the quickmask), but if you use a separate layer with a layer mask
you can change the graduated filter after the fact, making it
more gradual, or lower, or cutting out that tree sticking up above
the horizon, or whatever other editing you need, without losing the
contrast effect you've already done on the sky.

-- 
...Akkana
Beginning GIMP: From Novice to Professional: http://gimpbook.com
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