Comments by DANIEL_PD

DANIEL_PD 13-Oct-15 3:36am View

The method is defined as Color.FromARGB(int alpha, int red, int green, int blue) or as Color.FromARGB(int red, int green, int blue). In addition to that my source picture is grayscale, so red=green=blue and alpha=255

DANIEL_PD 13-Oct-15 3:33am View

Correct, I know that the one version is faster, that was what i wanted to achieve.... the problem is, that the results of both methods are different

DANIEL_PD 13-Oct-15 3:28am View

Hello and thanks for your answer,
I hope i got your text right... The Timing is only for comparison, to check if the one version is faster than the other, it will not be in the final code...

The Problem is the difference in the result when directly accessing the bits of the image. Shouldn't the data be locked in the memory by the LockBits method?

DANIEL_PD 13-Oct-15 3:25am View

Hello and thanks for your answer,
but the alpha value is not making a difference in my result (tried it)

DANIEL_PD 13-Oct-15 2:19am View

Thanks for the Answer, I set the maximum to a fix value and it worked... Thank you

DANIEL_PD 12-Oct-15 4:35am View

Hello George, thanks for your answer.
I had a try...catch around the code that calls this function, but obviously it wasn't enough...

pixels is initialized like following:


public static double[,] pixels;

and in the main code:


[...]
p_bmp = (Bitmap)Image.FromFile("C:\\Glasplatte\\TEST.tiff");
pixels = new double[p_bmp.Width, p_bmp.Height];
double val = CALC_BRIGHTNESS(p_bmp);
[...]

The following error is displayed:
System.IndexOutOfRangeException: Index was outside the bounds of the array...

I found out, that int bytes = Math.Abs(stride) * tmpBmp.Height; equals 327640 and then p[idx +2] is out of range... but why is the array to small?

Comments by DANIEL_PD (Top 6 by date)