Photoshop :: Color Lab (Curvas Eye Dropper Values)
Jun 7, 2013
About color lab color correction, in those days i'm watching a lot of tutorials about cause i'm trying to understand this new to me subject in a better way.
While neutralizing color, correcting a photo in Lab by Curvas adj Layer, the default eye dropper values are:
Black- 0, Gray- 128, White- 255 RGB (0-54-100 Lab)
To prevent the possibility of out of gamma some tutorials suggest to change the above mentioned default values:
Black from 0 to 26 RGB (0-6 Lab), White from 255 to 243 RGB (0-96 Lab)
What about the middle eye dropper Gray? A few tutorials mention to chage the gray value too from 128 to 133 RGB (54-56Lab) while the majority never mention gray value, they tell about black and white never mentioning the gray value; what is your experience about?
The above mentioned "out of gamma problem" is mainly related to output printing or to screen displaying too?
Generally speaking I would like to receive some comment by you gurus about this very subject, while working in Lab, what about your Curvas adj Layer eye dropper values, do you change them or you leave them as default?
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Jun 15, 2012
Was explaining to a friend about shades of color -- human eye has Red, Green and Blue sensitive cones and each can detect about 100 shades giving a combined total of about 1 million shades that we can normally distinguish, well within the 16 million shades that a jpeg can show (256 x 256 x 256) or the 64,000,000,000 shades (4096 x 4096 x 4096) that a TIF can show.
I used the eyedropper on a JPEG to show how the values went from 0 to 255 for each of Red Green and Blue, but when I went to a TIF expecting the RGB components to go from 0 to 4096 it showed 0 to 65535. To me this is an inaccuracy in the eyedropper tool at least for Tifs
I was trying to emphasize that while we may think that by having a greater range of shades available in the TIF we can produce richer images with more variety of images it all boils down to the lowest common denominator - that our eyes are not capable of determining a range of shades more than 1 million.
Try this test -- set your foreground color to RGB 128,128,128 grey and using the paintbrush tool draw a line. Then double click on the foreground box in the materials palette and change say the red value to 129 and draw another line overlapping the first one. Repeat increasing the red value and see when the difference in shading becomes obvious to your eyes. For me I had to go from 128 to 135 before I could recognize a difference so that is 7 values which look the same to me. So I cannot see even the 16 million colors of a lowly jpg let alone the small differences in a Tif.
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Jan 6, 2013
I have a question regarding illustrator. Let's say I have a circle with blue fill and red stroke. And I place an image in the illustrator file. Now I want to change the red stroke of my circle to let's say a purple color by sampling the color from the image.
How can I achieve that with a eye dropper tool? Every time when I try to sample a color from the image, the whole circle will change to purple instead of just the stroke? I have tried multiple key combination, shift, alt, ctrl but they all don't work.
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May 23, 2013
I am currently using Photoshop CS4 and for some reason my color dropper will only allow the color gray. It will let me select a new color, but when I hit OK, it stays gray. Did I hit a button that I was not aware of? How do I get it back to normal?
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Aug 8, 2005
I have been using Photoshop for quite sometime now for basic image editing and website design. I recently upgraded to 7.0 since 4.0 was giving me some trouble with memory errors that would result in loss of work. Anyways my question is this: Lately (as in the past week or 2) I have been having a problem with my Photoshop, when I would click on the color selector (the 2 color boxes in the tool selector box) it would select the Eye Dropper tool instead. And from there I could not do anything without hitting Alt + F4, after doing that the Eye Dropper tool would go away and I would be back where I started, still unable to change or choose a color. While the Eye Dropper tool is active when I do this I cannot click on anything or do anything, the Eye Dropper tool will not even function. I would only get an error sound as if I was trying to do something I'm not supposed too. I've never encountered this before and cannot find this same problem anywhere online. I have reinstalled PS numerous times and still the same effect. Has anybody else had or seen this problem? How can I fix it? Thank you for your time.
Nevermind, I found the problem. Apparently if I run PS with only 1 monitor on I get this error, but as long I have both monitors enabled it works fine. That's weird but atleast it works now.
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Nov 29, 2007
Seem to have lost my color picker or something strange...using Photoshop CS, now when ever I open a file work on it, if I choose the eye dropper or double click on the color square in the tool bar photoshop freezes, can't do anything. Have to force quit...I've not altered in any way any monitor or anything...
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Jul 15, 2005
I got a question about Photoshop CS. You know how when you are painting with the brush tool and then you press ALT to sample a color right? Well, it normally changes the foreground color to the color you sample, but mine’s just suddenly started changing the background color instead O_o. I rest tools, turn off the machine, but weeks later I find myself constantly have to switch to the background color, using (x) whenever I sample. It’s a pain in the ass! How do you change it back to normal?
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Nov 29, 2007
Seem to have lost my color picker or something strange...using Photoshop CS, now when ever I open a file work on it, if I choose the eye dropper or double click on the color square in the tool bar photoshop freezes, can't do anything. Have to force quit...I've not altered in any way any monitor or anything...
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Mar 28, 2013
Anytime I use the tool to copy a color, the entire format copies and changes the look of the object I already have selected. Is there a way to set my preferences so I only copy color with the Eye Dropper tool?
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Apr 16, 2012
This has happened during a few different projects I've had:
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Short Version: I'm just trying to make sure that the colored box prints the exact same color as the PDF's color and it's not.
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Long Version: Say I'm given a PDF, it's a poster, and it needs to have bleed (a border around it) added. I'll open Illustrator, put the PDF in there, and use a colored box for the additional bleed/border I'm adding. I'll use the eye dropper, click on part of the PDF - it'll give me the color of that spot. I'll take that color and apply it to the colored box, it changes color.
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The issue is that sometimes, that color the eye dropper picks up doesn't actually match the PDF's true color. I can fill in the colored box with whatever color the eye dropper picks up, but it's often a weird color, like with CMYK number values being at 98.35% or something And even when the color value on the PDF and box are the same, you can see a slight difference between that colored box and the real PDF.
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I'll even export that to a PDF and make sure it's correct, using the Object Data Tool or whatever it is, and then using the eye dropper there, and seeing that the color for my box and the PDF are at the same CMYK color values. And you can still see it's incorrect very slightly, and then when you print it it's obviously not the same. Even when I try picking it up in HSB or RGB, it's no good.
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May 2, 2012
I'm trying to make a script to transform shape by a value of below object.
(look sample image below)
And I'd like to know how to sample color from gradient-mesh or bitmap photo.
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 Does illustrator script have eyedropper or color sampling tool?
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May 11, 2012
Is there a modifier key to "choose the line color" when dragging the eye dropper? Looks like my only alternative to this is opening the color editor and choosing "line color" from the dropdown.
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Feb 26, 2014
The only color the eye dropper tool selects is black. (CS6)
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Aug 25, 2009
When you're editing a gradient within the shape (as opposed to in the Gradients palette), is there any way to use the eye dropper tool to sample an existing color? In-shape gradient editing (or whatever Adobe calls it) is useless without the eye dropper.
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Jun 17, 2012
How do I apply an eye dropped color directly to a Gradient Shape? Why can't I just do it like I would when applying a flat color with the Eye Dropper?
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Mar 21, 2013
So I am measuring the 'red' 'green' and 'blue' values of a picture after I adjust the white balance with a grey card.. I notice that if I measure the colors from 'selected layer' they are different then if I select 'entire image'  those are both different if i do not do any white balance adjustment..
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Which is the correct measurement that I should record?   I want the the white balance adjustment included.
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Feb 13, 2013
I have a photo of an object on a black background, and during the editing process the cmyk values of the black background are c=75 m=68 y=67 k=90. As this image is to be placed on a business card, if it is possible to change the values to 100% K or 40% C 100 %.
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Dec 22, 2008
Is there a way to select a portion of an image and display the average RGB or Lab values of that area? Right now I can only see the values of selected individual pixels. Instead of manually adding up these values to get the average value which is quite tedious, can someone help me to a better option?
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Oct 12, 2008
I have a selection or a layer of which I want to tweak the color. I use my color sampler to read the RGB values from my "source". How can I apply those values to my selection/layer ? If I use a color fill, I lose all detail in my original.
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Aug 4, 2008
Is there a way to select pixels in Photoshop based on given Lab values? I am using Select --> Color Range with a specified "fuzziness" threshold, but I'd rather make the selection based on specific Lab values instead of random pixels that I choose with my eye dropper. Is there a way to do this in Photoshop, or does anyone know of a plug-in that might do this?
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Dec 22, 2008
Is there a way to select a portion of an image and display the average RGB or Lab values of that area? Right now I can only see the values of selected individual pixels. Instead of manually adding up these values to get the average value which is quite tedious, can someone help me to a better option?
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Jul 16, 2013
I'm working in Photoshop CS 5.5 on a Mac, and I want to apply a specific CMYK color to a selection in an image. I create the color with the values C=0, M=100, Y=100, K=10 and add it to my color swatches. Then I select the section of the image where I want to apply the new color and fill it with the paint bucket. The color fills the section just fine and life is good. But then when I roll over the section with the eyedropper to double-check the CMYK values in the Info window, it shows that they've inexplicably shifted to C=9, M=100, Y=100, K=1.
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Sep 22, 2013
I'm using a Canon 40D, Photoshop 6 and a Mac Mini running OSX 10.8.4.
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I'm loading a RAW image from my Camera into Photoshop in 16 bit mode. As I understand it, my Canon 40D has a 12-bit A/D and RAW images have a 12 bit depth out of the camera. Loading them in 8-bit depth would lose some dynamic range/resolution, so I choose to load them in 16 bit mode.
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Once the RAW image is in Photoshop in 16 bits, I scroll over parts of the image with the color picker to see the pixel values. This is where I lose understanding of what's going on. The color picker shows pure white values as 32768 and pure black values as zero. Apparently Photoshop (or Camera Raw) is shifting the 12-bit camera data up to fill the top 16 bits in Photoshop. But this is not entirely true! If it truly shifted all 12 camera bits into the 12 MSBs of the 16 bit Photoshop value, wouldn't the max white value be 65535?? If the 12 bits were shifted into the 15th bit, wouldn't the max value be 32767?? Where does 32768 come from? Also, what is Photoshop putting into the LSBs after it does the shifting?
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I'm trying to do some averaging of lots of low light exposures using Linear Dodge in 16 bit mode. If photoshop indeed shifts the 12-bit camera values to the MSB of the 16 bit word, I'll eventually run into clipping when I sum my images. I'd have to go to 32-bit mode and that really slows down my system, almost to the point of uselessness.
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What's going on in 16-bit mode?Â
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Nov 25, 2013
PS CS 5.5.I want to replace color with a particular R,G,B value, but PS insists on some sort of difference setting that is not standard. Clicking on Final Value in the Replace Color window and entering treal values there has no affect, or has some seemingly arbitrary effect.
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Feb 18, 2013
On opening Elements 2, foreground color is white but changes to yellow if a file or image is opened. Checked hexadecimal values and they are the same. Operating system is Windows XP.
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Jul 9, 2012
Is it possible to make the color sampler tool show hsv values in the info panel instead of rgb?
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May 18, 2012
As long as a cmm is set up it is not possible to me to measure the same color value on screen (with an external color picker) that I entered in Corel's color definitions. This only works, when I turn off any cmm in Draw.
Plus it is not possilbe to export a pdf in which I can measue the RGB values that I defined in Draw. The closest I get is without a cmm (see above) but I still get readings that are off by 1 in most cases (I don't figure why rounding issues should be acceptable here).
The only export that works for me is to export for "Office" .. only then all values are exactly how I had defined them.
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Jun 19, 2013
I have a file from a client that has a table with the color values recorded as CMYK. (e.g. 50, 0, 10, 0)
I'd like to display the colors but I can only figure out how to do it if it's in the 256 color format. Is there a way for me to convert CMYK color values to a 256 color value. I realize the hues/colors won't be perfect, and I'll be happy with colors close to what the original data was using. Maybe there's a way to go from CMYK to RGB, and then to 246?Â
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Jun 5, 2013
If there is a way to make Outline Same as Fill - is there a way to Transfer color values from object to another?
 Select object you want to change THEN select object with color you want - hit button and it transfers?
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Jun 17, 2011
what the technique is called when you swap the values of two of the colors within a selection?
For example, let's say that we have a nice pinkish color for something... but you don't want pinkish. This would keep things looking relatively nice, simply by swapping all the red values with the blue values, giving you nice lavender-ish color instead. Or perhaps swapping blue with green values, giving you a more orange-y color.
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Feb 12, 2013
I've been placing photoshop tiff files into Illustrator, and doing this seems to change the color values, when I sample them with the eyedropper tool. The images I made use a custom mix of CMYK rich black, with the K set to 100. In Illustrator, they appear to revert to the default 'Photoshop black", approx C75 M68 Y67 K90. This is not my intent of C70 M60 Y58 K100. The Illustrator document is CMYK mode, and I don't know why this is happening. The non-image items (vectors) in my illustrator file DO retain the color values I intended, however.
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Is this some kind of setting I can change in Illustrator? Will this discrepancy show up when this file goes to print?
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