Luminosity Measurement In Astro Dark Frames[SOLVED]

[Arctic Eddie]

I'm going to do some dark frame noise measurements of several cameras as a function of temperature and ISO setting. I've been looking for a simple software program to display the sum of all pixel counts. However, nothing was located so it appears I'll have to learn how to write a PDN plugin. Using Code Lab, I've got the calculations performed but cannot find a way of displaying the results. Suggestions are appreciated. My code is shown below.

#region UICode
// Maybe something to trigger a data window
#endregion

void Render(Surface dst, Surface src, Rectangle rect)
{
Rectangle selection = EnvironmentParameters.GetSelection(src.Bounds).GetBoundsInt();
ColorBgra PrimaryColor = (ColorBgra)EnvironmentParameters.PrimaryColor;
ColorBgra SecondaryColor = (ColorBgra)EnvironmentParameters.SecondaryColor;
int BrushWidth = (int)EnvironmentParameters.BrushWidth; // ??????????????? Is this needed
long redsum = 0;
long grnsum = 0;
long blusum = 0;

ColorBgra CurrentPixel;
for (int y = rect.Top; y < rect.Bottom; y++)
{
	for (int x = rect.Left; x < rect.Right; x++)
	{
	CurrentPixel = src[x,y];
	// Add up the data
	redsum = redsum + (long)CurrentPixel.R;
	grnsum = redsum + (long)CurrentPixel.G;
	blusum = redsum + (long)CurrentPixel.B;
	}
}
// Print the result someplace
}

Edited September 28, 2011 by Arctic Eddie

[Rick Brewster]

The Paint.NET effects system is not designed to support image analysis.

[Arctic Eddie]

Is there any way to print out a numerical value?

[BoltBait]

You may want to read this page:

http://boltbait.com/pdn/codelab/help/overview.asp

along with the tutorials for CodeLab.

[Rick Brewster]

You'd have to print it out to a debug window or something ... System.Console.WriteLine()*, which I think you can monitor with something like Debug View ( http://technet.micro...ernals/bb896647 ).

It's fine if you're just doing the analysis for your own self. Not really a good solution if you're trying to make something that other people can use. You'd be better off just writing a program from scratch to load the image and analyze its contents. You can load images pretty easily using GDI+ from System.Drawing, or WPF/WIC from System.Windows.Media.Imaging. (I recommend the latter. GDI+ is ick, for many reasons I won't go into in this fairly short reply.)

* I'm not sure exactly which one DebugView can monitor. Maybe System.Console.Error.WriteLine(). Almost certainly not System.Diagnostics.Debug.WriteLine(), as that only works for debug builds. Otherwise it's a no-op.

[Ego Eram Reputo]

If you just want to find out the info, messagebox would be my suggestion. I believe you can call it from Codelab if you specify the full namespace:

System.Windows.Forms.MessageBox.Show("click me");

Note: Don't just bung it in, or you'll have to "click me" hundreds of times put a qualifier in there (if x==100 && y ==100 then...)

If you really, really need to write a string to the canvas this little effect shows you how:

void Render(Surface dst, Surface src, Rectangle rect)
{
PdnRegion selectionRegion = EnvironmentParameters.GetSelection(src.Bounds);
Rectangle selection = this.EnvironmentParameters.GetSelection(src.Bounds).GetBoundsInt();

Graphics g = new RenderArgs(dst).Graphics;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
g.Clip = new Region(rect);
ColorBgra PC = (ColorBgra)EnvironmentParameters.PrimaryColor;
SolidBrush B1 = new SolidBrush(Color.FromArgb(PC.A, PC.R, PC.G, PC.);
Font F = new Font("Courier New", 8);

// Copy existing image (source) to destination
for(int y = rect.Top; y < rect.Bottom; y++)
for (int x = rect.Left; x < rect.Right; x++)
	dst[x,y] = src[x,y];

	Point point1 = new Point(0,0);
	// these work, but are not limited to the canvas
	// int Mx = System.Windows.Forms.Control.MousePosition.X;
	// int My = System.Windows.Forms.Control.MousePosition.Y;
	// string sX = "x:"+ Mx.ToString()+ " y:" + My.ToString();

	// neither is this line limited to the canvas, but combines both coords into one string
	string sX = System.Windows.Forms.Cursor.Position.ToString();
	g.DrawString(sX, F, B1, point1);

}

[null54]

DebugView should also monitor System.Diagnostics.Trace.WriteLine() which would work in Release builds.

[Arctic Eddie]

I've not been able to get any of the suggestions working due to lack of knowledge of this particular coding scheme. I've used nine other languages in my total career but have not used C# or Code Labs before. However, I did find that Irfanview has a numeric readout in the histogram feature that will do exactly what I need. I just ran the test on a Panasonic FZ50 camera and got some very confusing results in RAW versus JPG. The later behaves as expected versus ISO but the former is nearly flat above ISO 100. My measuring problem is solved but now I have a camera phenomena to tackle.

Thank you all for your time and effort to help me in this endeavor.

Ed

[TaintedCherub]

I've not been able to get any of the suggestions working due to lack of knowledge of this particular coding scheme. I've used nine other languages in my total career but have not used C# or Code Labs before. However, I did find that Irfanview has a numeric readout in the histogram feature that will do exactly what I need. I just ran the test on a Panasonic FZ50 camera and got some very confusing results in RAW versus JPG. The later behaves as expected versus ISO but the former is nearly flat above ISO 100. My measuring problem is solved but now I have a camera phenomena to tackle.

Thank you all for your time and effort to help me in this endeavor.

Ed

The free image analysis program ImageJ, available from the NIH website http://rsbweb.nih.gov/ij/, is designed for these types of image analysis. Many plugins are available designed with academic/scientific image analysis goals in mind.