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Difference between c2g from Gimp and from Gegl command line

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Difference between c2g from Gimp and from Gegl command line Thomas Baruchel 28 Aug 06:47
  Difference between c2g from Gimp and from Gegl command line Jon Nordby 28 Aug 11:16
   [Newbie] A few more questions Thomas Baruchel 28 Aug 11:37
    [Newbie] A few more questions Jon Nordby 28 Aug 12:14
Thomas Baruchel
2011-08-28 06:47:16 UTC (over 13 years ago)

Difference between c2g from Gimp and from Gegl command line

Hi, I am new to GEGL but I would be interested by writing XML scripts in order to perform some complex actions from the command line. I managed to make c2g work with XML scripts, but obviously the output is not the same than what I get from Gimp.

Here are the two ways I found for making c2g work:

gegl -o - -x "38410231.811file.png" | display -

gegl -o - -x "38410231.811" | display -

As you can see, I use here the default settings from Gimp (except for "samples" where I tried with 10 both in Gimp and here). However this single operation performed on a picture doesn't give the same output. Do you have an explanation for that?

By the way, what is the most convenient way for having the input file from the standard input rather than setting its path in the XML file? There is such an example on http://gegl.org but I couldn't manage to get it work and I couldn't find what I had to change in my own command lines above to do it.

Best regards,

Jon Nordby
2011-08-28 11:16:17 UTC (over 13 years ago)

Difference between c2g from Gimp and from Gegl command line

On 28 August 2011 08:47, Thomas Baruchel wrote:

Hi, I am new to GEGL but I would be interested by writing XML scripts in order to perform some complex actions from the command line. I managed to make c2g work with XML scripts, but obviously the output is not the same than what I get from Gimp.

Here are the two ways I found for making c2g work:

gegl -o - -x "38410231.811file.png" | display -

gegl -o - -x "38410231.811" | display -

As you can see, I use here the default settings from Gimp (except for "samples" where I tried with 10 both in Gimp and here). However this single operation performed on a picture doesn't give the same output. Do you have an explanation for that?

You are using the "GEGL operation" tool for this in GIMP, right? I'm seeing the same behavior here, tested with your examples and with the color-temperature operation. If there is no bug filed for this issue, please file one.

By the way, what is the most convenient way for having the input file from the standard input rather than setting its path in the XML file? There is such an example on http://gegl.org but I couldn't manage to get it work and I couldn't find what I had to change in my own command lines above to do it.

Using path = "-" on a load operation is meant to work for this purpose. If it does not, that is a regression and is worth a bug report.

Best regards,

--
Thomas Baruchel
_______________________________________________ Gegl-developer mailing list
Gegl-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gegl-developer

Thomas Baruchel
2011-08-28 11:37:52 UTC (over 13 years ago)

[Newbie] A few more questions

On Sun, 28 Aug 2011, Jon Nordby wrote:

Using path = "-" on a load operation is meant to work for this purpose. If it does not, that is a regression and is worth a bug report.

Thank you for your very quick answer. I have some other questions. First, I couldn't manage to get it work with the standard input. I tried with - with '-' and with "-" like that:

cat Dimocarpus_longan_fruits.jpg | gegl -o - -x "3843231.811-" | display -

cat Dimocarpus_longan_fruits.jpg | gegl -o - -x "3843231.811'-'" | display -

cat Dimocarpus_longan_fruits.jpg | gegl -o - -x "3843231.811\"-\"" | display -

Another question: is there a way to blend layers by combining the HSV or HSL values (ie. take hue and saturation from one layer and light from the other one)? ImageMagick calls these modes: Luminize or Colorize; Gimp calls them Color or Value:
http://www.imagemagick.org/Usage/compose/#hue http://www.linuxtopia.org/online_books/graphics_tools/gimp_advanced_guide/gimp_guide_node55_004.html

Thank you by advance, best regards,

Jon Nordby
2011-08-28 12:14:29 UTC (over 13 years ago)

[Newbie] A few more questions

On 28 August 2011 13:37, Thomas Baruchel wrote:

On Sun, 28 Aug 2011, Jon Nordby wrote:

Using path = "-" on a load operation is meant to work for this purpose. If it does not, that is a regression and is worth a bug report.

Thank you for your very quick answer. I have some other questions. First, I couldn't manage to get it work with the standard input. I tried with - with '-' and with "-" like that:

I tested it now and it does indeed not work in latest gegl. Will you file a bugreport for this issue and the previous one (previous issue should probably be filed against GIMP)?

Another question: is there a way to blend layers by combining the HSV or HSL values (ie. take hue and saturation from one layer and light from the other one)? ImageMagick calls these modes: Luminize or Colorize; Gimp calls them Color or Value:
http://www.imagemagick.org/Usage/compose/#hue http://www.linuxtopia.org/online_books/graphics_tools/gimp_advanced_guide/gimp_guide_node55_004.html

I do not think there are such operations available at the moment (they should have been in the "compositors" category of the operation index[1]).
Implementing such an operation can be done by subclassing GeglOperationPointComposer, and using BABL to convert between HSV and RGB.

We want to have such operations in GEGL, contributions very welcomed!

1. http://gegl.org/operations.html#Categories