Average rating: 4.9


A Levels Tool – RGB and Individual Channels (with Histogram)

Would like to have a levels tool with Histogram plots for RGB and individual channels to plot the brightness and RGB values of an image to give a better indication of the range and distribution of shadow, mid-tones and highlights, or overall tonal range.

In the combined RGB Channel mode would like to use the Levels Tool may be used to adjust the contrast and brightness of an image, either manually or automatically if you can introduce a Auto Levels function where Black and White points are mapped to the set output levels and RGB values are re-distributed to avoid color shifts.

Then you can use the individual RGB channel mode to adjust color balance.

And, if possible, introduce a Shadow Picker and a Highlight Picker to adjust levels accordingly.

8 comments on “A Levels Tool – RGB and Individual Channels (with Histogram)”

  1. On November 4, 2016 at 2:38 am Al. wrote:

    this is an essential feature for any bitmap editor . photo raw would be useless without it!

  2. On November 16, 2016 at 10:27 am Javier Moreno wrote:

    Agree, on CO/LR you can see a living histogram while you change level/curves tool. Also, you can see the RGB -and- luminance values, not only absolute values, but also in percentage. It’s so useful for me the LR’s tone tool… I just can check the tones of the most important parts of the picture. Is this tone below 5% or above 95% ? If so, I know that will not be printed correctly (just pure black or while). What’s the tone of the illuminated part of this white face ? 50% … 60% ? what about the shadow part ? is it too dark ? I can have a good calibration on my monitor, but I need to see if shadows, lights, faces, are on the correct part of the tone scale. One I have checked that with the tone tool, I know that everything is going to be OK on printing.

  3. On January 22, 2018 at 11:54 pm Robert Dessert wrote:

    I agree. When I am caligration my camera/lens shooting targets like ISO 122233, it is essential to know the white and black levels for various parts of the target.

  4. On January 23, 2018 at 12:33 am Robert Dessert wrote:

    OTOH, in On1 2018 Photo Raw the Color eyedropper in the Develop module does give the RGB values at a specific point in the photo on a 0 to 255 scale, which is close to what I want. The Levels tab at the top apparently shows the intensity of the CMY and RGB colors in the entire photo from the darkest areas to the brightest areas. The color levels do change as I adjust the various sliders.

  5. On April 1, 2018 at 4:33 pm Javier Moreno wrote:

    I have tested again ON1 and there are a lot of improvements. But this feature is still missing. We have just a simple histogram with RGB readings. C’mon ON1 developers, we need a good tool here. It’s the only missing feature for me. I’m keeping my old LR4, it has the tone curve tool that is so useful for me.

    1. On April 2, 2018 at 12:35 am Don Maclean replied:

      There is a Curves Tool in the Tone Enhancer Effect, this thread is about a Levels Tool …

  6. On February 1, 2019 at 10:56 am Dan Harlacher wrote:

    There is a live histogram that shows the results of any adjustment. It also shows an RGB readout for any pixel you mouse over. There is a curves pane in Effects as well.

  7. On June 26, 2019 at 7:27 am lar zac wrote:

    90% of my developments are B&W. And even for color pictures a Luminosity histogram is often better and easier to read. I lack also this Luminosity only option (very common on RAW dev softwares).

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