Image cropping not work with tiff-files

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I have image that i wanna crop as polygon. With all images on my pc all work correct, but i have tiff files. If i try crop this - in result i see stretched piece of file.

C#

var img = (Bitmap)(GetPageFromTiff(openFileDialog.FileName));

img = CropImage(img);
pictureBox.BackgroundImage = img;
pictureBox.BackgroundImageLayout = ImageLayout.Zoom;
pictureBox.Image = img;

private Image GetPage(string file) {
  Bitmap bitmap = (Bitmap) Image.FromFile(file);
  bitmap.SelectActiveFrame(FrameDimension.Page, 0);
  MemoryStream byteStream = new MemoryStream();
  bitmap.Save(byteStream, ImageFormat.Tiff);
  return Image.FromStream(byteStream);
}

public Bitmap CropImage(Image img) {

 GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
 var points = new Point[] {
  new Point(85, 1111), new Point(934, 1111), new Point(934, 952), new Point(1642, 952),
   new Point(1642, 2000), new Point(85, 2000), new Point(85, 1111)
 };
 GraphicsPath gp = new GraphicsPath();
 gp.AddPolygon(points.ToArray());

 Bitmap bmp1 = new Bitmap(2220, 2220);

 using(Graphics G = Graphics.FromImage(bmp1)) {
  G.Clip = new System.Drawing.Region(gp);
  G.DrawImage(img, 0, 0);
  G.Dispose();


 }
 pictureBox.Image = bmp1;
 return bmp1;
}

https://snag.gy/UI3ZiA.jpg[^]

What I have tried:

I try save tiff as png, bmp and other. All the same. Tiff file for downloadhttp://www.filedropper.com/165173z[^]

Posted 5-Oct-16 21:43pm

Member 11266633

Updated 7-Oct-16 0:34am

v6

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Comments

Bernhard Hiller 7-Oct-16 3:44am

How do you load those tiff files? Show us the relevant code.

1 solution

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OriginalGriff · Answer 1 · 2016-10-05T22:16:00

Solution 1

If I take the code you copied from Stack Overflow: http://stackoverflow.com/questions/30954503/how-to-crop-a-polygonal-area-from-an-image-in-a-winform-picturebox[^]
And tweak it slightly to fit a test image:

C#

Point[] points = new Point[] { new Point(60, 10), new Point(100, 60), new Point(60, 110), new Point(10, 60), new Point(60, 10) };
GraphicsPath gp = new GraphicsPath();
gp.AddPolygon(points.ToArray());

Bitmap bmp1 = new Bitmap(120, 120);

using (Bitmap bmp0 = (Bitmap)Bitmap.FromFile(imagePath))
    {
    using (Graphics G = Graphics.FromImage(bmp1))
        {
        G.Clip = new System.Drawing.Region(gp);
        G.DrawImage(bmp0, 0, 0);
        bmp1.Save(imageOutPath, ImageFormat.Jpeg);
        }
    }

It works fine - I get a diamond of image inside a black image.
Looking at your region, it doesn't fit inside your output image...which may explain the problem...

Posted 5-Oct-16 22:16pm

OriginalGriff

Comments

Member 11266633 7-Oct-16 3:10am

Your code and my code work correctly but its not work with this tiff-file
http://www.filedropper.com/165173z

OriginalGriff 7-Oct-16 4:06am

If you think I am going to an unknown site to download an unknown file from a total stranger, you are wrong!
Start by checking if the file is valid: read it into an Image, and display it in a PictureBox. Does it look right? What size is it? If you save that as a JPG what happens? Does it work if you load the JPG version? And so forth...

Member 11266633 7-Oct-16 4:11am

its tiff file - whats the troubles? give me file sharing service - i upload it.

Member 11266633 7-Oct-16 4:18am

http://stackoverflow.com/questions/39904362/issue-with-picturebox-control

Member 11266633 7-Oct-16 4:18am

It work with picturebox, look right but after crop operation - not work

OriginalGriff 7-Oct-16 4:24am

And what does "not work" mean? Your computer contacts aliens? The picture becomes a LOLCatz? The shape is distorted?
What happens if you save it as a JPG and try with that?

Member 11266633 7-Oct-16 6:30am

sorry for my bad english. I try save it as jpeg, png and other. Same result. I improve question and add screen.