Slice up an image into several jpg files by C# and save them to SQL-Database.

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I want to slice up an image into 256x256 tiles and save out each tile as a jpg file to SQL-Database, I have taken input from user.
Can anybody tell me how do I get equal size slices(just like a checkerbox) of input images.

//button add data to dataGridView
//insert image from pictureBox to dataGridView
private void btn_Add_Click(object sender, EventArgs e)
{
        MemoryStream ms = new MemoryStream();
        pictureBox1.Image.Save(ms, pictureBox1.Image.RawFormat);
        byte[] img = ms.ToArray();
        dataGridView1.Rows.Add(txt_UserID.Text, txt_Name.Text, img);

        Bitmap bm = new Bitmap(@" ");
        int w = bm.Width / 2;
        int h = bm.Height / 3;
        Rectangle rTL = new Rectangle(0, 0, w, h);
        Rectangle rBR = new Rectangle(w, h, w, h);
        Bitmap bmTL = (Bitmap)bm.Clone(rTL, bm.PixelFormat);
        Bitmap bmBR = (Bitmap)bm.Clone(rBR, bm.PixelFormat);

    }

//browse image in pictureBox1 Click
private void pictureBox1_Click(object sender, EventArgs e)
{
    OpenFileDialog opf = new OpenFileDialog();
    opf.Filter = "Choose Image(*.jpg; *.png; *.gif)|*.jpg; *.png; *.gif";
    if (opf.ShowDialog() == DialogResult.OK)
    {
        pictureBox1.Image = Image.FromFile(opf.FileName);
    }
}

Posted 17-May-15 4:56am

Member 11657542

Updated 17-May-15 8:27am

v3

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Sergey Alexandrovich Kryukov 17-May-15 11:05am

Define "slice". What's the problem?
—SA

Member 11657542 17-May-15 11:10am

just like to tear an image in equal parts.

2 solutions

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-05-17T05:13:00

You work with images, not PictureBox, which is merely a (redundant) control used to show an image. To extract some rectangular part of the image, you can use the methods System.Drawing.Graphics.DrawImage:
https://msdn.microsoft.com/en-us/library/system.drawing.graphics.drawimage%28v=vs.110%29.aspx[^].

Don't use the methods which expect the size of new image, to avoid image resampling. Other methods will copy the image part as is.

Draw on what? Well, on any valid instance of System.Drawing.Graphics, but probably you would need to draw on another bitmap. Then create an empty bitmap of required size and get a Graphics instance to draw on it:
https://msdn.microsoft.com/en-us/library/system.drawing.graphics.fromimage(v=vs.110).aspx[^].

As to storing the images in database, it would be too bad to answer the question which have been answered so many times again. Please see: http://www.codeproject.com/search.aspx?q=%28%22.NET%22+OR+%22C%23%22%29+database+%28image+OR+images+OR+bitmap+OR+bitmaps%29&doctypeid=1%3b3%3b14%3b5[^].

It's not always good to store images in a database. It's often better to store only the image names and store the images themselves in the file system. This is usually the better option for Web sites.

—SA

OriginalGriff · Answer 2 · 2015-05-17T05:18:00

Solution 2

Use the Bitmap.Clone method:

C#

Bitmap bm = new Bitmap( @"D:\Temp\MyPic.jpg" );
int w = bm.Width / 2;
int h = bm.Height / 3;
Rectangle rTL = new Rectangle( 0, 0, w, h );
Rectangle rBR = new Rectangle( w, h, w, h );
Bitmap bmTL = (Bitmap)bm.Clone( rTL, bm.PixelFormat );
Bitmap bmBR = (Bitmap)bm.Clone( rBR, bm.PixelFormat );

Posted 17-May-15 5:18am

OriginalGriff

Comments

Member 11657542 17-May-15 11:40am

image is from user input so how I pass this address?
Bitmap bm = new Bitmap( @"D:\Temp\MyPic.jpg" );

OriginalGriff 17-May-15 12:01pm

Just create the image in the usual way - that line is just an example.
How would you normally use the user input?

Member 11657542 17-May-15 13:32pm

for instance I have tried it on static image how do I save these several sliced files in sql.