Problem with Format16bppGrayScale in .NET

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Any one have idea about how to handle 16 bit gray scale images in .net consider this two simple code:

VB

Dim Bitmap As New Bitmap(100, 100)
       Dim BitmapData As BitmapData = Bitmap.LockBits(New Rectangle(0, 0, Bitmap.Width, Bitmap.Height), ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format16bppGrayScale)

when you debug this code this error will happen:

Parameter is not valid.

Is there any other way to handle 16 bit gray scale image in .net?
Attention please I know I can use 48bpp instead it but my consider in the speed of my application specially when change contrast/brightness, for a 3072*3072 image the process of changing contrast/brightness is around 0.7 second and it is clear that it is not suitable for real time. Please give another solution.

Posted 5-Jul-15 22:46pm

mehdishahgholi

Updated 6-Jul-15 1:38am

v2

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Kornfeld Eliyahu Peter 6-Jul-15 7:35am

Format16bppGrayScale?

mehdishahgholi 6-Jul-15 7:38am

sorry I update the question

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Kornfeld Eliyahu Peter · Answer 1 · 2015-07-06T01:57:00

Solution 1

The pixel format in LockBits must be compatible with the format of the bitmap you want to lock...A simple new Bitmap(w,h) with no additional parameters will create a 32 bit RGB image, and it can not be locked as 16 bit gray-scale!!!
Use the constructor variant that can get pixel format too: https://msdn.microsoft.com/en-us/library/3z132tat(v=vs.110).aspx[^]

VB

Dim Bitmap As New Bitmap(100, 100, PixelFormat.Format16bppGrayScale)

Posted 6-Jul-15 1:57am

Kornfeld Eliyahu Peter

Updated 6-Jul-15 1:58am

v2

Comments

mehdishahgholi 7-Jul-15 1:24am

@Kornfeld Eliyahu Peter: Dear Peter
Yes I know I try this before:
Dim Bitmap As New Bitmap(100, 100, System.Drawing.Imaging.PixelFormat.Format16bppGrayScale)
Dim a As Integer = System.Drawing.Imaging.PixelFormat.Format16bppGrayScale
Dim BitmapData As BitmapData = Bitmap.LockBits(New Rectangle(0, 0, Bitmap.Width, Bitmap.Height), ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format16bppGrayScale)
Dim GrayLevelMap(100 * 100 - 1) As Short
Dim R As New Random
For i = 0 To GrayLevelMap.GetUpperBound(0)
GrayLevelMap(i) = R.Next(0, 32768)
Next
Marshal.CleanupUnusedObjectsInCurrentContext()
Marshal.Copy(GrayLevelMap, 0, BitmapData.Scan0, GrayLevelMap.Length)
Bitmap.UnlockBits(BitmapData)
PictureBox2.Image = Bitmap
but picturebox show a white box with a red x on it !!!