Empty pixel color

I am a professional photographer who normally shoots a Canon 1Ds Mk III and a 5d. I long ago noticed that when I pulled my images into Lightroom - particular those shot at high ISO in low light - there would be a slight shift in color, usually to the detriment of the image, after I selected it.
Very recently, I suffered a bad accident that put me in the hospital for two surgeries and now I am convalescing with an artificial shoulder. That same accident knocked my 5D out of commission. While I have done no real work since, I kept shooting for journal purposes, but with only my left hand, it was extremely difficult to use the M III and so for my birthday, my kids gave me a Canon Powershot G9.
While the G9 is great fun and has decent IQ at the low ISO, it is extremely noisy at high ISO. When I pull low light, high ISO G9 images (I shoot RAW, btw)) into Lightroom, as noisy and grainy as they are, the color balance can appear to be close to perfect and the effect nice - UNTIL I select an image. Then it suddenly takes on terrible burgandy cast.
So I finally figured what caused the slight color shift, even with the 1Ds. Lightroom is taking all those empty spots and is filling them with colored pixels that together create the burgandy cast. This makes color balance almost impossible, as the invented color in the filled in area has nothing to do with the original colors of the image.
Is there anyway to control this? It seems to me that if I could set Lightroom to fill in those empty areas with 18 percent gray, instead of the arbitrary color, this color shift could be avoided.
Any suggestions?

The color shift you are seeing is actually caused by Lightroom first showing the jpeg preview embedded in the RAW after which it shows its own interpretation of the RAW data. Read this FAQ for example.
http://www.adobeforums.com/webx/.3bc3d55a
Lightroom simply has a different interpretation of the RAW data than your camera. Apparently Lightroom 2 might have a solution to this issue. You can also calibrate Lioghtroom/ACR to your camera at the high ISOs using a colorchecker chart to improve its color rendering.

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Differentiate empty and non-empty pixels

I'm a web developer currently slicing an illustrator file for web graphics. Some of the icons and images have shadows, lights, etc, and it's impossible to simply see by a naked eye which pixels contains some shade or nearly transparent color and which doesn't.
It would be extremely useful if I could somehow easily differentiate between empty and non-empty pixels, so I wouldn't miss any when slicing.
Any advices??

Select the objects you want to cut, pick the artboard tool, and from its presets menu on the control bar choose Fit to Selected Art. In Safe for Web and Devices window, in the Image Size tab, make sure Clip to Artboard is checked. This will cut the image without including any empty (fully transparent) pixels.
edit: Alternatively if you hide unselected art (Shift+Ctrl+Alt+3), in the Safe for Web and Devices with the Clip to Artboard unchecked will cut the selected object/s without including fully transparent pixels. So with this approach you don't have to use artboards.
You can create new artboards for each icon, element, etc, by drawing with the Artboard tool and holding Shift. With the desired objects selected, draw a new artboard anywhere on the document with any size and choose Fit to Selected Art.
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Magic Wand Selection Tool Fails to Operate on Precise Pixel Color

I had an interesting thing happen with Photoshop CS5... My Magic Wand tool got to where it wasn't selecting pixel colors based on the one under the tip of the tool when clicked. It was selecting what seemed like similar colors, but its operation wasn't really predictable.
It turns out that in a prior unrelated operation (days ago) I had changed the color picker to look at a very large number of pixels when sampling.
Having chosen the above, the setting was sticky and modal (meaning it subsequently affected samples taken from then on by a variety of tools).
I didn't think that this should affect subsequent samples taken with the Magic Wand tool. I'm not sure this has always been the case, but it doesn't seem as though it should work this way.
Notably I don't see any way, while the Magic Wand tool is active, that the above sample size can be changed. Nor did Resetting the Magic Wand tool correct the situation.
Should the previously selected color picker sample size actually affect the Magic Wand tool, or is this a case where someone at Adobe consolidated the pixel sampling logic a bit too aggressively?
If the latter, here's an adage to post in the halls of Adobe Engineering: "Make everything as simple as possible, but no simpler."
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Hm, appears to be an old issue: http://forums.adobe.com/message/3226358
What I can't fathom is that it's never bitten me before. I do tend to leave the eyedropper on 1 x 1 pixels, but I occasionally do sample larger regions.
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I know nothing about java, but I 'll learn if I need. But first, I need to know if a java web applet can do the goal I need:
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juliochile wrote:
I know nothing about java, but I 'll learn if I need.
But first, I need to know if a java web applet can do the goal I need:Fair enough
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How to write java code to read the pixel color in some place of screen?

Hello all:
How to write java code to read the pixel color in some place of screen?
The java application iteself doesn't have any GUI.
thank you
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See java.awt.Robot

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hello,
if u know how to retrieve the pixel color of any specified coordinate pixel
,say (x,y) please let me know ,i ll be thankfull to u.

hello,
if u know how to retrieve the pixel color of any specified coordinate pixel
,say (x,y) please let me know ,i ll be thankfull to u.

Get pixel color on screen

What function do I use to get pixel color of screen
ChangChiTheGraphics
chang Chi

Hello C.H.Chi
This code might solve your problem.
public partial class Form1 : Form
public Form1()
InitializeComponent();
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this.Text = pixelColor.ToString();
private void Form1_Load(object sender, EventArgs e)
myBitmap = new Bitmap(Properties.Resources.Tulips);
place a image in your resource file and access from their.
Kindly mark as answer if found useful.

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I appreciate the response but this kind of defeats the purpose of what I am looking to do. Since i have already used the color replacement tool to define a certain area, why should i not be able to easily select that area?
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hello,
if u know how to retrieve the pixel color of any specified coordinate pixel
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you can try to create a new image and paint on that image.
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Welcome to the Apple Community.
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Empty pixel color

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