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Curves Tool feature request (again?) - and Color Picker

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Curves Tool feature request (again?) - and Color Picker gimpdev@bwiese.cotse.net 24 May 16:57
  Curves Tool feature request (again?) - and Color Picker Sven Neumann 24 May 17:37
  Curves Tool feature request (again?) - and Color Picker saulgoode@flashingtwelve.brickfilms.com 24 May 18:08
gimpdev@bwiese.cotse.net
2009-05-24 16:57:32 UTC (over 15 years ago)

Curves Tool feature request (again?) - and Color Picker

Hello Gimp Developers!

Thank you so much for work over the years, I'm constantly impressed with Gimp and how powerful, feature rich, and professionally well done it is as a FOSS project even when compared up against Photoshop. I'm getting more into photography and would like to use Gimp instead of Photoshop

I'm trying to do some color correction in Gimp, particularly "Removing Color Casts" as I read in this howto[1] from 1998. The author notes however that:

"Unfortunately, the GIMP does not allow the precise color correction that is available in PhotoShop. This is due to the fact that the Color Picker does not work in conjunction with Curves."

So I googled, and found this wonderfully explained and proposed feature request from 1999 that sounds like exactly the same thing:

http://lists.xcf.berkeley.edu/lists/gimp-developer/1999-August/009720.html

Has that happened yet? I'll admit that I'm a newbie at Gimp and probably missed it, but could not find out how to do this from the 2.6 interface. I encounter the same problem in both "Curves" and "Adjust Color Levels":

"Now there are two main pains with the GIMP in making use of the above technique. First, in the Curves tool I have to estimate the place where I am on a curve and if I move that point I have to estimate where I've moved it to."

(However, in "Adjust Color Levels" - I did see a picker for black/grey/white and an 'auto' button (whatever that does). Also, when I move my mouse pointer over the image, only the X/Y coordinate changes on the bottom left of the window, it does not display the R,G,B values (as Lightroom does, as % instead of 0-255) while I need to open the Color Picker for that.) Please advise if this is possible and I'm just missing something!

Otherwise, if this is still a pending feature request... where else can I "bump" it up? I'll throw money at this, and I bet others would to. =)

Thanks, Brian

[1] http://www.geocities.com/SiliconValley/Haven/5179/

Sven Neumann
2009-05-24 17:37:46 UTC (over 15 years ago)

Curves Tool feature request (again?) - and Color Picker

Hi,

On Sun, 2009-05-24 at 10:57 -0400, gimpdev@bwiese.cotse.net wrote:

So I googled, and found this wonderfully explained and proposed feature request from 1999 that sounds like exactly the same thing:

http://lists.xcf.berkeley.edu/lists/gimp-developer/1999-August/009720.html

Has that happened yet? I'll admit that I'm a newbie at Gimp and probably missed it, but could not find out how to do this from the 2.6 interface. I encounter the same problem in both "Curves" and "Adjust Color Levels":

"Now there are two main pains with the GIMP in making use of the above technique. First, in the Curves tool I have to estimate the place where I am on a curve and if I move that point I have to estimate where I've moved it to."

Among other things the old mail you are linking to proposes to use Shift-Click in the image to add a control-point. Did you try to Shift or Ctrl with the Curves tool active and the pointer over the image window? Looks like there's a status-bar hint missing for this nice feature...

The best way to get any of the other changes into GIMP is to discuss it here first and then to make a patch that implements it.

Sven

saulgoode@flashingtwelve.brickfilms.com
2009-05-24 18:08:19 UTC (over 15 years ago)

Curves Tool feature request (again?) - and Color Picker

In addition to Mr Neumann's comments, while the Color Picker dialog can not be raised simultaneous with the Curves dialog, you can display the Sample Points dialog ("Windows->Dockable Dialogs->Sample Points") and display the pixel values for multiple points after placing them on the image.

Sample points are created by holding down the CTRL key and dragging from one of the rulers on to the image. To move sample points, activate the Color Picker and drag them to a new location. To remove a sample point, activate the Color Picker and drag it back to one of the rulers.

Quoting "gimpdev@bwiese.cotse.net" :

(However, in "Adjust Color Levels" - I did see a picker for black/grey/white and an 'auto' button (whatever that does).

The Auto button performs an automatic white balance ("Colors->Auto->White Balance").