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Is there a targeted adjustment feature in the curves settings of GIMP. To set colour curves. Like in Photoshop?

Photoshop curves

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    \$\begingroup\$ I’m voting to close this question because it's a question about using an image editing tool without a clear application to photography. Could you please edit your question to explain the photography issue you're trying to solve? Thanks! \$\endgroup\$
    – Philip Kendall ♦
    Jul 22, 2020 at 15:54
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    \$\begingroup\$ This appears to be an XY Problem Rather than ask us how to do what you think you need to do to fix your problem… why not ask us about your problem? \$\endgroup\$
    – Tetsujin
    Jul 22, 2020 at 17:31
  • \$\begingroup\$ @PhilipKendall Is there any SE site where this woud be on-topic? \$\endgroup\$
    – jng224
    Jul 22, 2020 at 17:42
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    \$\begingroup\$ Curves don't work in 'user-selected' colours, hence my XY comment. You have decided this is how to fix your issue. What you need to do is ask about your actual issue. \$\endgroup\$
    – Tetsujin
    Jul 22, 2020 at 18:43

2 Answers 2

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The curves tool in GIMP does not have any adjustment droppers (see the screenshot). However, the levels tool does.

  • You can make rough adjustments with the levels tool and switch over to the curves tool by clicking the button labeled "Edit these Settings as Curves".

  • If you click on the image, a vertical line will appear in the curves dialog to show the corresponding portion of the curve.

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No, because the Curves dialog acts along a single dimension. What you require would have to work along 3 dimensions (ie, pick a point in a volume).

If you want to match colors, see here and here.

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    \$\begingroup\$ Curves tool has two dimensions... there's the input axis and the output axis. \$\endgroup\$
    – xiota
    Jul 23, 2020 at 4:00
  • \$\begingroup\$ Yes, and this means it acts on one dimension. output=function(input). \$\endgroup\$
    – xenoid
    Jul 23, 2020 at 9:47
  • \$\begingroup\$ I'm no mathematician, but doesn't that actually make it a 2-dimensional array, by the time you have all possible values for input & output? \$\endgroup\$
    – Tetsujin
    Jul 23, 2020 at 14:58
  • \$\begingroup\$ @Tetsujin No. An actual setting is a list of 256 output values, indexed by the output values, so it has only one dimension. \$\endgroup\$
    – xenoid
    Jul 23, 2020 at 15:47
  • \$\begingroup\$ Since there are separate curves for Luminance and color channels, the input can be considered four dimensional. \$\endgroup\$
    – xiota
    Jul 24, 2020 at 5:50

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