Questions tagged [curves]

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5
votes
2answers
2k views

What is a “Slanted S” in a curves layer?

I am trying to do a Photoshop tutorial, seems easy, but I can't understand one phrase: `First, I add a curves layer and create a slanted S. What does slanted S mean? Maybe I should "write" S in curves ...
13
votes
2answers
4k views

How does the Curves tool work in GIMP?

I started using GIMP recently, and came across an option called Curves under the Colors menu. What does this tool do, and how do I use it correctly? I get some good colors if I make a graph in 'S' ...
12
votes
3answers
818 views

How are the levels and curves tools related?

I started to use levels and curves tools quite recently and now I mostly use the second one. Mostly this is due to the fact that I understand the underlied mathematics of curves better than levels. My ...
9
votes
3answers
904 views

What is the difference between levels, curves and contrast settings in post processing?

I have found and read a lot of tutorials that speak individually about curves, levels and contrast in post-processing but no luck so far about finding something that compares them. It is my ...
3
votes
3answers
9k views

What's the best method to change colours in a photo to another specific color?

What is the best way to change the colours in a photo to a specific colour? Specifically, how can we change the colours using Curves or Levels Layer? Here are few examples for understanding: orange ...
9
votes
1answer
2k views

In ufraw, how to use the two curves?

I have a basic understanding of curves. That is, I know the mathematical concept behind them, and I have an idea what happens when I change them. But this knowledge came from sources which assumed ...
3
votes
2answers
202 views

How to find curve that correspond to a given transformation?

I am having a little bit of a mathematical approach here... I suppose that all the transformation we can make to an image which operate on one pixel per time (for example levels, saturation, color ...
0
votes
2answers
222 views

Is it possible to simulate any color-only filter with curves?

In this question it was asked whether it was possible to reproduce any color-only change to an image using just curves. In my answer, I said that there were color-only changes such as conversion to ...