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gimprc gamma and gamma_convert

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gimprc gamma and gamma_convert Robin Rowe 07 Sep 07:32
  gimprc gamma and gamma_convert Sven Neumann 08 Sep 09:47
gimprc gamma and gamma_convert Robin Rowe 08 Sep 04:42
Robin Rowe
2003-09-07 07:32:37 UTC (over 21 years ago)

gimprc gamma and gamma_convert

Hi. I'm looking at the gimprc file and wondering how GIMP handles gamma.

# Set the gamma correction values for the display # 1.0 corresponds to no gamma correction. For most displays, # gamma correction should be set to between 2.0 and 2.6 # Run the utility "gamma_correct" to determine appropriate values # for your display.
#
# One important item to keep in mind: Many images that you might # get from outside sources will in all likelihood already be # gamma-corrected. In these cases, the image will look washed-out # if the gimp has gamma-correction turned on. If you are going # to work with images of this sort, turn gamma correction off # by removing this line, or setting the values to 1.0. # gamma-correction 1.0
# gamma-correction 2.0
#
(gamma-correction 1.0)

This came from a GIMP 1.2.3 Windows gimprc.

Setting a gamma value of 2.2 or 1.0 in gimprc had no visible effect. How is this feature enabled?

Is there a gamma setting somewhere in the preferences dialog?

Where is the gamma_correct tool mentioned in gimprc?

Thanks,

Robin --------------------------------------------------------------------------- Robin.Rowe@MovieEditor.com Hollywood, California www.CinePaint.org Free motion picture and still image editing software

Robin Rowe
2003-09-08 04:42:38 UTC (over 21 years ago)

gimprc gamma and gamma_convert

Hi. I'm looking at the gimprc file and wondering how GIMP handles gamma.

# Set the gamma correction values for the display # 1.0 corresponds to no gamma correction. For most displays, # gamma correction should be set to between 2.0 and 2.6 # Run the utility "gamma_correct" to determine appropriate values # for your display.
#
# One important item to keep in mind: Many images that you might # get from outside sources will in all likelihood already be # gamma-corrected. In these cases, the image will look washed-out # if the gimp has gamma-correction turned on. If you are going # to work with images of this sort, turn gamma correction off # by removing this line, or setting the values to 1.0. # gamma-correction 1.0
# gamma-correction 2.0
#
(gamma-correction 1.0)

This came from a GIMP 1.2.3 Windows gimprc.

Setting a gamma value of 2.2 or 1.0 in gimprc had no visible effect. How is this feature enabled?

Is there a gamma setting somewhere in the preferences dialog?

Where is the gamma_correct tool mentioned in gimprc?

Thanks,

Robin --------------------------------------------------------------------------- Robin.Rowe@MovieEditor.com Hollywood, California www.CinePaint.org Free motion picture and still image editing software

Sven Neumann
2003-09-08 09:47:36 UTC (over 21 years ago)

gimprc gamma and gamma_convert

Hi,

"Robin Rowe" writes:

Setting a gamma value of 2.2 or 1.0 in gimprc had no visible effect. How is this feature enabled?

The short answer is that the gimprc gamma setting is ignored. The longer answer is that there are a some plug-ins that ask GIMP for this value and might choose to do something with it. But since it is ignored in general, these plug-ins can't probably be doing the right thing.

Sven