Re: get the darkest pixel from an image - C# Discussion Boards

17-Nov-10 3:40

hello may i know how do i go abt getting darkest pixel from a image and apply a floodfill?

fjdiewornncalwe17-Nov-10 3:45

fjdiewornncalwe

17-Nov-10 3:45

You'll pretty much have to iterate through each pixel and then keep the darkest one you find. You will also have to define "darkest" if the image isn't greyscale.

I wasn't, now I am, then I won't be anymore.

pancakeleh17-Nov-10 4:02

17-Nov-10 4:02

Bitmap objBitmap = new Bitmap(pictureBox3.Image);

        for (int y = 0; y < objBitmap.Height; y++)
        {
            for (int x = 0; x < objBitmap.Width; x++)
            {

            }
        }

do i do this way? if my image is greyscale how do i go about doing it? sorry i am very new to programming.

Pete O'Hanlon17-Nov-10 4:29

Pete O'Hanlon

17-Nov-10 4:29

If I were you, I'd look at using a third party library such as AForge for this. If you must do this, then you are going to have to write unsafe code to efficiently manipulate the pixels. I'd start off by reading Christian Graus' articles here on CP on image processing.

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Onyx

Internet Explorer Script Error

_Erik_17-Nov-10 5:37

_Erik_

17-Nov-10 5:37

The important thing is the pixel format. If you can use GetPixel on the image (so pixel format is not indexed) and you want to avoid the usual headaches of locking bits, you can use GetBrightness method for each one. If pixel format is indexed you will not be able to use GetPixel, so you will have to lock bits and get the color of each pixel from the palette before you can use GetBrightness. This little sample[^] might help you in the last case.

Krishna Varadharajan16-Nov-10 23:25

Krishna Varadharajan

16-Nov-10 23:25

Hi,

In my webbrowser application frequently iam getting Internet Explorer Script Error.....the page not support the Jscript. I created the webbrowser application using IE Component. How to rid of this...kindly give me one solution.

krishna

Re: Internet Explorer Script Error

Manfred Rudolf Bihy17-Nov-10 1:52

Manfred Rudolf Bihy

17-Nov-10 1:52

Hello Krishna!

Sounds like a JavaScript issue so please post this question in the correct forum: "JavaScript".
It's there. I know, I've been there before Wink | ;)

.

Plus to make it easier for us to help you:

1. Reproduce the exact error message. A screeshot would be nice.

2. Give a small concise example that will enable us to reproduce that error.

Tanks,

Manfred

AForge filter

pancakeleh16-Nov-10 21:57

16-Nov-10 21:57

hello i am using visual studio, C# to create filter.

// load an image<br />
        System.Drawing.Bitmap image = (Bitmap)Bitmap.FromFile("C:\\Users\\Pictures\\sample1.jpg");<br />
<br />
        pictureBox1.Image = image;<br />
<br />
        // format image<br />
        AForge.Imaging.Image.FormatImage( ref image );<br />
<br />
        // create filter<br />
        PointedColorFloodFill filter = new PointedColorFloodFill();<br />
        // configure the filter<br />
        filter.Tolerance = Color.FromArgb(150, 92, 92);<br />
        filter.FillColor = Color.FromArgb(255, 255, 255);<br />
        filter.StartingPoint = new IntPoint(150, 100);<br />
        // apply the filter<br />
        filter.ApplyInPlace(image);

however when i try to run, an error occurred, needing help!
the error is " Source pixel format is not supported by the filter."

Re: AForge filter

Pete O'Hanlon16-Nov-10 22:27

Pete O'Hanlon

16-Nov-10 22:27

The error tells you what the problem is. The PixelFormat of your image is not supported by the filter. Check the documentation to see what formats are supported and then check your code to see what the PixelFormat of the image is. In the case of the PointedColorFloodFill, it supports 8 bpp grayscale and 24 bpp colour images. If the PixelFormat of your image is 32 bpp, then you can clone it to 24 bpp and it should work OK.

Three points here:
1. The error was very specific, a quick google would have identified the cause in 20 seconds or so.
2. You need to read the documentation.
3. As this was a problem with a third party, you should have asked there first.

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Onyx

Re: AForge filter

pancakeleh16-Nov-10 22:59

How Create TLS connection for jabber protocol

16-Nov-10 22:59

thank you for your reply. i got it.

Member 427485516-Nov-10 20:47

Member 4274855

16-Nov-10 20:47

HI All,
I want to know how create a TLS connection for jabber protocol using standard dotnet frame work. Thanks

Re: How Create TLS connection for jabber protocol

Richard MacCutchan16-Nov-10 21:28

Richard MacCutchan

16-Nov-10 21:28

Take a look here[^].

Just say 'NO' to evaluated arguments for diadic functions! Ash

Screenshot with Windows Service (Win7)

Jacob D Dixon16-Nov-10 18:30

16-Nov-10 18:30

So I have been trying to take a screenshot with a windows service... don't think I really have to say I haven't been successful. I think it is because of new security features with Windows 7 that does not allow it to interact with a users session in that way?

I have tried using the built in functions for .NET and this code:
http://www.codeproject.com/Messages/1705493/how-to-take-a-screenShot-using-windows-service.aspx[^]

They just take a black screen. I have also tried setting the service to interact with desktop (still black pic).

Now is there is way I can make a service take a screen shot? Also if I can't.. do you think I might be able to make the service start a process (exe I create) that takes a screen shot and saves the file, then teh service grabs that file? I haven't tested it, but was wondering if that would be possible. Wouldn't running the process make it run under console and be able to take a screenshot?

First I would like the service to do it, but the process idea is a plan B if that would even work.

Mycroft Holmes16-Nov-10 18:55

Mycroft Holmes

16-Nov-10 18:55

Jacob D Dixon wrote:
I think it is because of new security features with Windows 7

There is a reason for that, think about it do you want the ability for a service to be able to take a picture of your phone. While I cannot think of a valid reason for this, I can think of plenty of malicious reason to attempt to get a snapshot of a users screen.

Never underestimate the power of human stupidity
RAH

Jacob D Dixon17-Nov-10 4:55

17-Nov-10 4:55

Well I assure you it isn't for malicious reasons. I'm working on a personal project that monitors computers to get updated information such as hardware info, software, processes, etc. We actually use a software now called LabTech (labtechsoft.com) and I noticed it took screen shots of people's machines (that have the agent installed). I was trying to duplicate that.

#realJSOP17-Nov-10 2:08

#realJSOP

17-Nov-10 2:08

You can write a conosle app that takes the screen shot, and run that app from the service.

.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
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"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001

Jacob D Dixon17-Nov-10 4:56

17-Nov-10 4:56

Thanks John. I will give that a try to see how it works out.

_Erik_17-Nov-10 5:47

_Erik_

17-Nov-10 5:47

This is becouse of Session 0 isolation[^] in Windows Vista and Windows 7. I have made no test about it, but I think that any application opened from a service in Session 0 will also be in Session 0, so you'd get the same result.

Jacob D Dixon17-Nov-10 6:39