Cannot Read RAW Image bytes

[wario2k]

Hello,
I'm currently having an issue with reading raw byte data from a file into a magick image object.
Exception encountered: no decode delegate for this image format `' @ error/blob.c/BlobToImage/458
I, unfortunately, cannot share the data I am using but it is essentially raw image data retrieved from an image capture system. I need to be able to read the data and then save it in either jpg or png formats.

Version : Magick.NET-Q8-AnyCPU.7.14.3 (tried with newer versions but the removal of the tobitmap() method affects other portions of my code base which I currently cannot modify.)
Env: Windows 10
.Net Framework Version: 4.6

Please let me know if I can provide any additional clarification. Any help would be greatly appreciated.

[dlemstra]

What is the format of the data? How is the image stored in the byte array?

[wario2k]

The data is being read from an embedded binary file. The data is being written directly from a capture system to this file. The array contains data for 9 images and the size of the array is specified by the block in the file I am trying to read.

…

On Sun, May 9, 2021 at 11:08 AM Dirk Lemstra ***@***.***> wrote: What is the format of the data? How is the image stored in the byte array? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#923 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACW7VMJB7XE3KSXLYEUQ4MTTM2QQJANCNFSM44PGHHGA> .

[dlemstra]

Are there any specifications on how the image data is stored? Because ImageMagick cannot just guess how the read the data. Can you share a file and it's specification?

[wario2k]

I, unfortunately, can't share any files since this is dealing with medical data. I read the Image data that is embedded in a binary file and try to feed it into ImageMagick. All I know for sure is that the images are raw 16-bit grayscale images and the data contains no encoding information. I tried to load the original byte values into a System.Drawing.Bitmap but when I tried to manipulate it I got some GDI+ errors when I tried to save the bitmap, but once the values of the byte arrays were mapped to 32-bit ARGB it worked fine. Not sure if the problem with Format16bppGrayScale in Bitmaps persists into ImageMagick as well.

…

On Mon, May 10, 2021 at 4:22 AM Dirk Lemstra ***@***.***> wrote: Are there any specifications on how the image data is stored? Because ImageMagick cannot just guess how the read the data. Can you share a file and it's specification? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#923 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACW7VMJ4AF4ES7AS27AAABTTM6JSRANCNFSM44PGHHGA> .

[dlemstra]

The issue with ImageMagick/Magick.NET is that you are feeding it data and it has no idea what you are feeding it. You could do something like this to read raw pixel data:

var data = GetByteArray();
var settings = new PixelReadSettings
{
    Mapping = "R", // Only a single red (grey) channel
    StorageType = StorageType.Short, // 16-bit per pixel
    ReadSettings = new MagickReadSettings
    {
        // You probably need to change this to the correct value
        Width = 100, 
        Height = 100
    }
};

using (var image = new MagickImage())
{
    image.ReadPixels(data, settings);
    image.Write("yourfile.png");
}