Pixel Color

I have an object of "Canvas" and I want to get the Color of the point where the user has clicked. How?

Fast and dirty: If you are not talking about an applet, you could use java.awt.Robot.
Better solution:
In Canvas the entire Canvas gets painted in the paint(Graphics) method. If you paint to an Image, not directly to the canvas, and paint that image to the Canvas to make it look the same, then you can find the color of any pixel by inspecting the Image. See the java.awt.PixelGrabber class on how to get the pixels of an image.

Similar Messages

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."
-Noel

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.
-Noel

Web applet to get pixel color

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:
A java web applet that can pass a specific pixel color on the browser windows to javascript. The coordinates of that pixel will stay outside the own applet borders.
I don't know if this is the right forum, so can you please help me in any way?
Thanks a lot.
Julio Morales.

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
A java web applet that can pass a specific pixel color on the browser windows to javascript. Yes this can be done, but as I recall it was somewhat of a pain. It will also be browser-specific. If you ask me the requirement is probably flawed.
The coordinates of that pixel will stay outside the own applet borders.Huh? So you need to sample a pixel? This post makes little sense. Post the exact use case. Way too vague.

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
-Danel

See java.awt.Robot

Get pixel color

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();
Bitmap myBitmap;
private void Form1_MouseMove(object sender, MouseEventArgs e)
Color pixelColor = myBitmap.GetPixel(e.X, e.Y);
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.

Selecting just a pixel color in photoshop without regard to luminosity?

If i use the color replacement tool to say color a car a different color. Since this car is now one color without any variation in tone, how can I select this color to make more adjustments? When i use the color range selection tool   it seems to calculate for luminosity values as well.
Any ideas here?

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?
If you use the dropper tool it will have a meter that shows decimal values for the rgb channel. It will be something like=
r:25:
g:50
b:62
This would be the same pixel color
r:26
g:51
b:63
It is the same color because it has the exact same ratio of RGB, just different luminosity levels of each.
Now, if you paint a car a specific color like a dark green blue and say the rgb values are 25;50;68
What are the chances that this exact ratio exists anywhere else in the image? Sure it may, but not much if your useing a unique color. So if you are able to select just this value/ just the ratio.
This is what i am trying to do.
I know this is not a beginner question, but hopefully someone has some insight, I cant be the first person trying to select a color.

Get pixel color in J2ME

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

you can try to create a new image and paint on that image.
Image img = new Image( yourcanvaswidth, yourcanvasheight );
yourcanvas.paint( img.getGraphics() );
int [] rgbs = new int[ yourcanvaswidth, * yourcanvasheight ];
img.getRGB( rgbs, 0, yourcanvaswidth, 0, 0, yourcanvaswidth, yourcanvasheight );
the rgbs holds RGB values of you canvas.
hope this will help

Monitor has weird, pixelated colors, but external monitor looks fine

I have a MacBook Pro. It is a couple of years old. Recently the monitor started fritzing out. At first it would happen only happen when I ran windows through boot camp. A couple of days later, it began happening in os x too.The screen seems to be operating on a reduced amount of colors, a preponderance of green and everything is pixelated. There are blobby shaped circles of rainbow all over the desktop. Windows on top of the desktop look better, but still way too green and pixelated. All parts of the screen are equally bad. I tried changing all the settings in display. Also ran disc utility. The display on the external monitor looks fine. Any ideas on how I can fix this?

Some MBP have bad nVidea graphics chips that can do wheat you describe, except it usually affects an external monitor as well. It's covered by a warranty extension program here:
http://support.apple.com/kb/TS2377

Clip turns to pixellated color static upon insertion into timeline

I'm not sure how to fully describe this issue or how to fix it. I'm currently working on a demo reel with a number of clips that have different sizes, aspect ratios, etc. When I tried to add one particular clip to the timeline, one from a project I actually did in Final Cut Pro recently (the others were .mov's originally made in Adobe Premiere and Avid), when played back from the timeline the clip is utter color static, a pixellated mess. I cannot figure out how to fix this or what specifically is causing this odd issue.
Any ideas? ; )

The file that is pixellating is a .mov created in Final Cut (sorry if that's not what you wanted to hear). Here's the specs:
6.8GB
29.97 fps
720x480
DV/DVCPro - NTSC
3.6 MB/sec
Pixel Aspect: NTSC - CCIR 601
Field Dominance - None
Alpha - None
Composite - Normal
While I've managed to track down .mov's of the other clips, they have a plethora of sizes, ranges, and rates. There's nothing much I can do about this, they were done on an old system, on an old platform (some on Adobe Premiere and some on Avid) and I do not have a simple way to reconstruct them. If there's a way to get the .mov made in Final Cut to work as the other files have, that would be ideal. That one I can resave if necessary.
Here's the clips that have worked so far:
1) A 177.9 MB .mov, Cinepak Compressed, 720x480, 1.1 MB/sec, NTSC - CCIR 601, Field Dominance: Lower (Even), 29.97 fps
2) A 36.2 MB .mov, Sorenson Video 3 Compressed, 400x300, 155.6 K/sec, Pixel Aspect: Square, 29.97 fps
3) A 27.6 MB .mov, Sorenson Video 3 Compressed, 640x480, 29.97 fps, Pixel Aspect: Square, 159.9 K/sec
4) A 137.8 MB .mov, Sorenson Video 3 Compressed, 400x300, 29.97 fps, 111.9 K/sec, Pixel Aspect: Square

Apple TV problem with video artifacts and pixel color changes

I noticed that in the most recent software update on my Apple TV there is quite a bit of pixel noise on the screen. In dark colors of the picture they really show up, bright green and white dots appear...random pixels that I thought at first my plasma was going, but I paused a movie the other night on my Apple TV and the Pixels also Paused, so I know it's the Apple TV and it does not occur on any other programming inputs. It was fine till the last Software update so I am thinking something is wrong with that update.

Welcome to the Apple Community.
Video should work regardless of the wifi card you are using. Whay exactly is happening when you say video won't work.
You can use network utility (in your Utilities folder) to learn more about the network capabilities of your mac.

Reading pixel color from Image?

Hello frnds,
I am making a project in which i have to upload Image, am trying to find color of each pixel in RGB format so that I can locate where my sprite begins in Image !!
But I am not able to do so.. do I have to use PixelGrabber to do that? or should i use RGBImageFilter..!! I am new to java so if u can tell me how to use them, then It would be grateful.
I want to scan whole image from left to right, Right to left, top to bottom and vice-versa. So that I can exactly tell at what pixel value sprite starts and ends.
Please help me out. any sort of help will be useful for my project..
Thanking you in advance.

Image bufferImage;PixelGrabber pg1;
public boolean fetchPixels(byte[] jpegData, int[] pixelData)
     try
          bufferImage = Toolkit.getDefaultToolkit().createImage(jpegData);
          // this may not be required unless asynchronous, but seems to do no harm
          MediaTracker mt = new MediaTracker(jcamData);
          mt.addImage(bufferImage, 0);
          try
               mt.waitForID(0);
          catch(InterruptedException e)
               e.printStackTrace();
          if(mt.isErrorAny()==true)
               System.out.println("Exception fetchPixels "+"createImage failed");
               // flush anything in bufferedImage
               if(bufferImage!=null)bufferImage.flush();
               return false;     // and pixelData not updated
          Thread.yield();
          pg1 = new PixelGrabber(bufferImage, 0, 0, camWidth, camHeight, pixelData, 0, camWidth);
          try{pg1.grabPixels();}catch(InterruptedException e){}
          Thread.yield();
          // flush bufferedImage as no longer needed, and so not to be in memory cache for next image load
          if(bufferImage!=null)
               bufferImage.flush();
     catch(Exception e){System.out.println("Exception fetchPixels "+e);}
     return true;
}

Detect pixel color from Raster

Hi
I am trying to count the number of white pixels I have in a grayscale TIFF image, using JAI I get a buffered image then pass in a portion of the image (raster) to a method. This works fine for some of my images and not at all with others, I have, after lots of pain and suffering ive found out that in some of the images a white pixel is 0 while in others it is -1.
I am counting white pixels and considering all others black ...to allow bi-tonal and grayscale images alike. I am lost as far as these images are concerned ...my guess is that the info i need is in the sample model but i have spent more time researching the inner workings of image than the scope of my project requires already
so im hoping someone can help me out here ...all i wanna do is detect a white pixel in a raster (hopefully this is as easy as it sounds)
-Jerome BG

Well after doin a bunch of reading and investigative work I know way more about image rendering and visualization than I ever wanted to know. So I know that you cant determine the pixel's color without the ColorModel, but since I can convert grayscale images to bi-tonal i know all ill have is 0 or 1 ...I still dunno how to use the ColorModel to determine which is which, but its not so important since all my images have white as 0.
Any ways if anyone out there is as obtuse as my self just using:
myRaster.getSample(x,y,band)(only one band for bi-tonal images) you get the bit as an int.
If anyone knows how to determine how to find out rather white or black is 0 using the Raster and the ColorModel I would still like to know
-Jeorme BG

Free program that I can download that will let me change pixel colors in a photo or image

I not sure what community and category I should put this in, but I am looking for a free program that will let me manipulate the color of pixels in a photo or image. Any suggestions? Thanks Randall

Software Mac OS X Lion 10.7.5 (11G63)
Memory 3 GB 667 MHz DDR2 SDRAM
Processor 2.16 GHz Intel Core 2 Duo

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.

Questions about: Checking pixel color , moving the mouse , checking sound.

Is it possible to check the color of pixels on the screen (not just in a jframe) ?
Is it possible to use java to compare sounds being played by a program that is running with sound from a file ?
Is it possible (when using the robot class to move the mouse) to make it so that java is running only in the background (ie. have something else running in the foreground) ?
Is it possible to make a tray icon appear next to the system clock when a java program is running ?
Are there any differeces when running programms on windows, linux and/or mac ?

Is it possible to check the color of pixels on the screen (not just in a jframe) ?
Is it possible to use java to compare sounds being played by a program that is running with sound from a file ?
Is it possible (when using the robot class to move the mouse) to make it so that java is running only in the background (ie. have something else running in the foreground) ?
Is it possible to make a tray icon appear next to the system clock when a java program is running ?
Are there any differeces when running programms on windows, linux and/or mac ?

Pixel Color

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