RGB channels Curves adjustment please

Please, add the possibility to adjust individually each RGB channels in curves....

Are you saying that this tool is not UseFull ? Are you Saying that this tool is not usefull in Photoshop too ?
Look, It's okay for me if you like to cut your beefsteak with a butter knife.... But LightRoom is a production tool for professionals, and professional need precision and productivity.
RBG Adjustment tool is not about getting adjustment more easy, it's about getting precise and accurate adjustments in precise tones. Just try to do all this on the same image in Lightroom, and if you really can, for sure it's not faster as you could do it with the RGB Adjustment curves :
- increase the blues in the shadows
- reduce the blues in the Highlights
- reduce the reds in shadows
- increase the reds in highlights
- increase the greens in highlights
I'm looking forward to see how you do that in a fast way LR.

Similar Messages

RGB Channel Curves or Levels

Hello,
I would like to see the ability to adjust the black and white point of the R, G, and B channels independently, as can be done in Aperture and PS, as well as the tone curve for each channel. I like the LR interface and UI approach very much, so I would be looking for something that fits into this frameworkperhaps a "Red", "Green", and "Blue" tab at the top of the tone curve window as we now have for Hue, Saturation, and Luminance in the HSL panel?
Also, a thanks for the 0 - 100% readouts. I find this fantastic, and wish I had this option for readouts in PS!
Many Thanks,
Michael Morrison

Agreed. This is a much needed feature!!

LR4.1 - Tone Curve - how to adjust individual RGB channels?

Hi,
I am having trouble figuring out how to adjust the curve of individual RGB channels. I am assuming the LR4 Tone Curve works like the PS Curves dialog with the channel dropdown.
The LR4.1 Help says:
To make adjustments to individual points on the tone curve, choose an option from the Point Curve menu, click the Edit Point Curve button , and do any of the following:
Choose an option from the Channel pop-up menu. You can edit all three channels at once, or choose to edit the Red, Green, or Blue channel individually.
When I click the little icon in the lower right corner of the Tone Curve panel, the panel shrinks so that I don't see the Regions sliders. If I click again, they are visible again. I can't find where to select one of the three indvidual channels.
The Help refers to "the Point Curve menu." Where is the Point Curve menu? Is the Point Curve different from the Tone Curve?
If I right-click (Windows) in the curve dialog, the context menu has a Show Info option. I click it on/off and don't see any change or any info. Where should I be looking for info?
Thanks for any help here.
John

Good morning John,
The point curve is the one without the sliders. The adjustments for the individual channels are only available with
PV2012. You must be editing a file with PV2010 or 2003. When in PV2012 you will see " Channels: RGB" below the curve window. Click on the doule triangles following the RGB
to pick the individual channel.
HTH
Rich

New RGB Tone Curve also a Basic Levels Adjustment?

Adobe Staff: at first I was pleased and then let down about the new RGB Tone Curve feature because I thought it allowed for Levels Addustments - as with so many other photo editing software including Adobe PS Elements where you can squeeze in the left and right triangles to ajust the blacks and highlights and midtones.
I was playing with the Lr4b RGB curve yesterday and - is it correct that it does essentially act the same as "Levels Adjustment" by squeezing inwards the blacks (lower left) and whites (upper right) points?
Thank-you

Yeah, but blacks and whites in the basic panel are better, and usually should be applied after you've appled the others.

I would like an RGB Curves adjustment.

I switched from Aperture 3 to Lightroom 3 for the ColorChecker Passport integration, but I really miss the RGB Curves in both Aperture 3 and Photoshop. I've been using Curves in Photoshop for years. I really wish there was one in Lightroom 3.
If anyone agrees with me, please add your vote.

Aye!
+1 vote
It's just not possible to get the sophisticated cross-processing look without RGB curves adjustment.

? Selecting 2 of 3 RGB channels in to adjust in Levels

This is a CS4 question (and let me express my ingratitude to Adobe for dropping support for an $1800 set of apps).
In Photoshop CS4, using a G5 (non-Intel), in the Channels view panel (alongside Layers, etc), when it is displaying RGB, Red, Green,and Blue I am able to shift-click, on say, the Red and Blue channels to sleect only those two. The image still displays in full RGB. When I issue command-L (Levels) I end up with the basic Levels disalog box, and instead of it choosing by default "RGB" for adjusting, I now have "RB" and I can adjust Red and Blue together with the sliders, avoiding the green channel. I can do this in, obviously, three combinations.
For some reason, when I try this same thing on a friend's Intel Mac with Photoshop CS4 (same!), shift-clicking the Red and Blue channels in the Channels palette chooses them but the image display now displays without the Green channel influencing the image, thus rendering it unusable for adjusting two channels at once.
I figure that since I am using the same App version on each Mac, maybe there is a setting somewhere I cannot find, or I am forgetting a step on the way to my friend's computer.
Q: How do I choose 2 channels in the Channels palette while still having my image display in full color, and also be able to choose those two channels for adjustment in the Levels?
For those of you who are wondering WHY I would want to adjust 2 channels at once, here's an example: an image looks lsightly too yellow, bt ther eis no yellow channel. Yellow is full Red & Green, so, using my method, I can choose both those channels, and reduce the yellow by reduing R and G together.

You should be able to shift click the red and blue channels, then make the rgb composite visible (make the EYE visible by clicking in that box)

How to adjust individual RGB channels?

Hi there, is is possible on a iMac to adjust the individual RGB channels? if so, how? if not, is there anyway to control the colour temperature of the screen? thanks

Hi,go to System Preferences and choose Displays, from there choose 'Color' and 'Calibrate' and then check the 'Expert Settings' box. You can then vary the colour temperature and each channel, saving your results as a profile so it can be easily switched or applied to an indiviual image in Preview.
mrtotes

RGB Channel unavailable in Camera Raw under point in the Tones Curve

How can I use the the RGB channel in Camera Raw under Tone Curve?

Hi yariel83,
Make sure under the Camera Calibration tab that the Process is set to 2012.

Need iMac G5 (iSight) monitor calibration help (RGB Channels?)

I understand the need to calibrate my display so that the final print matches what I see on my display. I plan to use the Gretag Macbeth Eye One Display calibrator, which I have already used on my last CRT monitor, with good results. I needed to adjust the Brightness, Contrast and RGB Channels individually to get the profile on the CRT monitor. I cannot seem to find these same controls in the iMac G5. Am I just blind...or do they not exist in this computer? Please help! Thank you, Regina
iMac G5 iSight Mac OS X (10.4.5)

You do not have individual channel calculation on an LCD at least not with the G-M software (apple's built-in calbrator does a software calibration for individual channels, but you'll still be closer with the Eye-One Match results). Brightness you can set with the slider in display or by using the keyboard controls. Contrast is in universal access, but you should just leave it alone. The default setting is the correct one for beginning a G-M calculation.
EDIT Are you aware that there was an update to the G-M software a couple of weeks ago? You can download it from their website.

Using color sampler values with curves adjustment layer

Hi, I have just started trying to teach myself javascript. Based on preliminary research, it's become apparent that there are many functions in Photoshop that are either extremely cumbersome or impossible to code by hand without using the Script Listener.
My goal is as follows: first, I will manually load two photos as layers in a single document. Then I will manually place two or more color sampler points on the document. At this point I would like the script to create a curves adjustment layer (ideally clipped to layer 2) and place as individual channel anchor points the RGB data from the color sampler points on Layer 2, and then adjust the output of the points on each channel to the color sampler RGB values of layer 1.
As my first script, I realize this is probably going to be a lot of work.
I did find some code that returns the average value of manually placed color sampler points. Conceptually then, I would need to add code which creates a new curves adjustment layer and adds those RGB values (from a specific layer) as anchor points on the individual channels, and then hides one layer and looks at the RGB values of the color sampler points, and uses them as the output values for each anchor point.
Sounds simple enough from a conceptual standpoint.
I'm looking for some guidance on how to get started.
Which parts will I definitely need Scriptlistener for and will that be adequate to do the job?
How would you recommend I get started on this?
Thanks very much for any input.

The function I had provided was an example into which you would need to feed the values you got with Mike’s code.
The code below would create a Curves Layer as shown in the screenshot, but I’m not sure it would work reasonably for all cases.
// with code by mike hale;
// 2012, use it at your own risk;
// call the function to run the script
#target photoshop
createCurveAdjustmetFromColorSamplers();
// create a function fo hold most of the code
function createCurveAdjustmetFromColorSamplers(){
    // first add some condition checks
    // needs an open document in a color mode that supports layers
    if(app.documents.length == 0 || ( app.activeDocument.mode == DocumentMode.BITMAP || app.activeDocument.mode == DocumentMode.INDEXEDCOLOR ) ){
        alert('This script requires a document in Greyscale, RGB, CMYK, or Lab mode.');
        return;
    // check for at least two colorSamplers
    if(app.activeDocument.colorSamplers.length < 2 ){
        alert('This script requires at least two colorSamplers.');
        return;
    // last check for at least two layers - assume they will be on same level( not in layerSet )
    if(app.activeDocument.layers.length < 2 ){
        alert('This script requires at least two layers.');
        return;
    // create varaibles to hold the colorSampler's color property for each layer
    // for the bottom layer
    var outputArray = new Array();
    // for top layer - array could also be created this way
    var inputArray = [];
    // store the number of samples because it will be needed in more than one place
    var numberOfSamples = app.activeDocument.colorSamplers.length;
    // hide the top layer
    app.activeDocument.layers[0].visible = false;
    // collect the samples from the bottom layer
    for(var sampleIndex = 0; sampleIndex < numberOfSamples; sampleIndex++ ){
        outputArray.push(app.activeDocument.colorSamplers[sampleIndex].color);
    // turn the top layer back on
    app.activeDocument.layers[0].visible = true;
    // collect those samples
    for(var sampleIndex = 0; sampleIndex < numberOfSamples; sampleIndex++ ){
        inputArray.push(app.activeDocument.colorSamplers[sampleIndex].color);
    // make sure the top layer is the activeLayer
    app.activeDocument.activeLayer = app.activeDocument.layers[0];
// create arrays of the color values:
var theArray = [[0, 0, 0, 0, 0, 0]];
for (var m = 0; m < inputArray.length; m++) {
theArray.push([inputArray[m].rgb.red, outputArray[m].rgb.red, inputArray[m].rgb.green, outputArray[m].rgb.green, inputArray[m].rgb.blue, outputArray[m].rgb.blue]);
theArray.push([255, 255, 255, 255, 255, 255]);
// sort;
theArray.sort(sortArrayByIndexedItem);
// makeCurveAdjustmentLayer();
rgbCurvesLayer (theArray)
////// make rgb curves layer //////
function rgbCurvesLayer (theArray) {
// =======================================================
var idMk = charIDToTypeID( "Mk " );
    var desc5 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
        var ref2 = new ActionReference();
        var idAdjL = charIDToTypeID( "AdjL" );
        ref2.putClass( idAdjL );
    desc5.putReference( idnull, ref2 );
    var idUsng = charIDToTypeID( "Usng" );
        var desc6 = new ActionDescriptor();
        var idType = charIDToTypeID( "Type" );
            var desc7 = new ActionDescriptor();
            var idpresetKind = stringIDToTypeID( "presetKind" );
            var idpresetKindType = stringIDToTypeID( "presetKindType" );
            var idpresetKindDefault = stringIDToTypeID( "presetKindDefault" );
            desc7.putEnumerated( idpresetKind, idpresetKindType, idpresetKindDefault );
        var idCrvs = charIDToTypeID( "Crvs" );
        desc6.putObject( idType, idCrvs, desc7 );
    var idAdjL = charIDToTypeID( "AdjL" );
    desc5.putObject( idUsng, idAdjL, desc6 );
executeAction( idMk, desc5, DialogModes.NO );
// =======================================================
var idsetd = charIDToTypeID( "setd" );
    var desc8 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
        var ref3 = new ActionReference();
        var idAdjL = charIDToTypeID( "AdjL" );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref3.putEnumerated( idAdjL, idOrdn, idTrgt );
    desc8.putReference( idnull, ref3 );
    var idT = charIDToTypeID( "T   " );
        var desc9 = new ActionDescriptor();
        var idpresetKind = stringIDToTypeID( "presetKind" );
        var idpresetKindType = stringIDToTypeID( "presetKindType" );
        var idpresetKindCustom = stringIDToTypeID( "presetKindCustom" );
        desc9.putEnumerated( idpresetKind, idpresetKindType, idpresetKindCustom );
        var idAdjs = charIDToTypeID( "Adjs" );
            var list1 = new ActionList();
                var desc10 = new ActionDescriptor();
                var idChnl = charIDToTypeID( "Chnl" );
                    var ref4 = new ActionReference();
                    var idChnl = charIDToTypeID( "Chnl" );
                    var idChnl = charIDToTypeID( "Chnl" );
                    var idRd = charIDToTypeID( "Rd " );
                    ref4.putEnumerated( idChnl, idChnl, idRd );
                desc10.putReference( idChnl, ref4 );
                var idCrv = charIDToTypeID( "Crv " );
                    var list2 = new ActionList();
// add r points;
for (var m = 0; m < theArray.length; m++) {
          addCurvePoint (list2, theArray[m], 0)
                desc10.putList( idCrv, list2 );
            var idCrvA = charIDToTypeID( "CrvA" );
            list1.putObject( idCrvA, desc10 );
                var desc15 = new ActionDescriptor();
                var idChnl = charIDToTypeID( "Chnl" );
                    var ref5 = new ActionReference();
                    var idChnl = charIDToTypeID( "Chnl" );
                    var idChnl = charIDToTypeID( "Chnl" );
                    var idGrn = charIDToTypeID( "Grn " );
                    ref5.putEnumerated( idChnl, idChnl, idGrn );
                desc15.putReference( idChnl, ref5 );
                var idCrv = charIDToTypeID( "Crv " );
                    var list3 = new ActionList();
// add g points;
for (var m = 0; m < theArray.length; m++) {
          addCurvePoint (list3, theArray[m], 2)
                desc15.putList( idCrv, list3 );
            var idCrvA = charIDToTypeID( "CrvA" );
            list1.putObject( idCrvA, desc15 );
                var desc20 = new ActionDescriptor();
                var idChnl = charIDToTypeID( "Chnl" );
                    var ref6 = new ActionReference();
                    var idChnl = charIDToTypeID( "Chnl" );
                    var idChnl = charIDToTypeID( "Chnl" );
                    var idBl = charIDToTypeID( "Bl " );
                    ref6.putEnumerated( idChnl, idChnl, idBl );
                desc20.putReference( idChnl, ref6 );
                var idCrv = charIDToTypeID( "Crv " );
                    var list4 = new ActionList();
// add b points;
for (var m = 0; m < theArray.length; m++) {
          addCurvePoint (list4, theArray[m], 4)
                desc20.putList( idCrv, list4 );
            var idCrvA = charIDToTypeID( "CrvA" );
            list1.putObject( idCrvA, desc20 );
        desc9.putList( idAdjs, list1 );
    var idCrvs = charIDToTypeID( "Crvs" );
    desc8.putObject( idT, idCrvs, desc9 );
executeAction( idsetd, desc8, DialogModes.NO );
return app.activeDocument.activeLayer;
////// add curve point //////
function addCurvePoint (theList, valueHor, theNumber) {
var desc11 = new ActionDescriptor();
var idHrzn = charIDToTypeID( "Hrzn" );
desc11.putDouble( idHrzn, valueHor[theNumber] );
var idVrtc = charIDToTypeID( "Vrtc" );
desc11.putDouble( idVrtc, valueHor[theNumber+1] );
var idPnt = charIDToTypeID( "Pnt " );
theList.putObject( idPnt, desc11 );
////// sort a double array, thanks to sam, http://www.rhinocerus.net/forum/lang-javascript/ //////
function sortArrayByIndexedItem(a,b) {
var theIndex = 0;
if (a[theIndex]<b[theIndex]) return -1;
if (a[theIndex]>b[theIndex]) return 1;
return 0;

Can't click drop-down lists in curves adjustment layer

Odd behavior in released x64 version of CS6 for Windows: on my laptop (ASUS G73S with 1.5 gb nVidia GeForce video), when I crop an image, the drop-down menus in a curves adjustment layer become unclickable. But I can still access the RGB channels using the Alt + 3, 4 and 5 shortcuts. This behavior doesn't occur on my workstation, and if I don't crop the image, the drop-down menus work fine. I have the crop tool set to delete pixels. Also, if I apply curves directly (not with an adjustment layer), the dialog box works OK. And the other adjustment layers seem to be working, too. It's only the curves layer that's doing this.
Any ideas what this could be? I'm wondering if I should report it as a bug.

I've noticed that a few times on windows 8 32 bit, photoshop cs6 32 bit with 4gb of ram, a nVidia 8400 gs graphics card and open gl seems to work fine.
I guess that's probably some kind of glitch.
One way to get back the dropdown is to click on the Curves Display Options in the flyout menu and then just click OK in the dialog.
Added: It doesn't seem to happen if the crop tool is set to Classic Mode.
Message was edited by: R_Kelly

RGB Channels grayed out

In my Camera Raw 6.7, when using the Tone Curve, the RGB channels are grayed out and can not be switched on, probably because the Raw Defaults are missing.
How can they be restored?
Thanks,
Walter

I don't believe that individual color channels can be adjusted in camera raw 6.7, even though you see that.
They can be adjusted in camera raw 7.x and 8.x.
In camera raw 6.7 your always adjustng the composite RGB channels.
more info: (Jeff Schewe is an expert on adobe camera raw)
http://forums.adobe.com/thread/1154075

Adding points to Curves Adjustment Layer in PsCS6 broken?

In CS3, CS4 and CS5 I was able to:
(a) add a point (corresponding to the position of the Eyedropper Tool on the image) to the RGB composite curve by Control + Clicking; and
(b) add a point (whilst focused on the RGB composite curve) to each of the Red, Green and Blue channel curves by Control + Shift + Clicking.
Neither approach seems to work in my CS6 (PsCs6 x64 latest update, on Win 7x64).
Is some kind soul able to tell me the correct key combination to achieve the desired result, or is there truly a problem with CS6 ?
Message was edited by: Andrew_Hart

It should be documented here:
https://helpx.adobe.com/photoshop/using/curves-adjustment.html
The gist of the above is the on image adjustment tool (targeted adjustment tool) needs to be enabled
(the hand symbol with arrows in the properties panel)
then you just click on the image (no modifier key) to add a point to the composite curve and Ctrl+Shift to add points to the red, green and blue channels.

Cannot view histogram in curves adjustment panel

I've tried the Curves Display Options. The show Channel Overlays and Intersection Line check boxes work; the Histogram and Basline boxes do not. I've reset preferences and I'm up to date. Nothing will bring up the histogram in the curves adjustment panel. Any clues please?

Yes Paul, all four boxes in the Show section of the Curve Display Options dialogue box have been checked. However, I now have the histogram working. I reset preferences one more time and restarted Photoshop (yet again). So it seems there must be a preference which disables the histogram display in the Curves panel although I don't know what it is.

How to fix numeric entry box in Curves adjustment layer?

In the Curves adjustment layer Properties box there are numeric entry boxes for changing input and output values. The first few times I experimented with changing the output values of a selected point in the R, G, & B channels, all went well. Now, although I believe I am using the same method, I can only access the input value box. The moment I click on the output value box both boxes black out and no entry is possible. I'm using the Windows version of Photoshop CC, so Tab doesn't work to get from the input to the output box. I have tried resetting the Preferences for Photoshop and that seemed to work once, briefly, but now that makes no difference.
I have fixed the problem with Adobe Customer Support Chat. The solution was to delete the Adobe Photoshop CC Settings folder. With Photoshop closed, open the Start menu and type %AppData% in the search bar (Windows 7); this takes you to the Roaming folder where you then navigate to the Adobe folder and the Adobe Photoshop CC folder. We removed the Adobe Phototshop CC Settings folder by dragging it to the desktop. Once it was established that this fixed the problem, the folder was deleted from the desktop.
Message was edited by: C55279
Problem solved

I've noticed that a few times on windows 8 32 bit, photoshop cs6 32 bit with 4gb of ram, a nVidia 8400 gs graphics card and open gl seems to work fine.
I guess that's probably some kind of glitch.
One way to get back the dropdown is to click on the Curves Display Options in the flyout menu and then just click OK in the dialog.
Added: It doesn't seem to happen if the crop tool is set to Classic Mode.
Message was edited by: R_Kelly

RGB channels Curves adjustment please

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