Cropping Images in C#

[jpuopolo]

All:

I looked around and could not find a simple yet complete example of
cropping an image in C#. I had the problem of needing to shave off the
bottom-most 18 lines of a directory full of images. The following code
does this. I hope that this serves as a concise yet complete example
of how to tackle cropping an image.

---
Note that inputDireName and outputDirName have been set in the class
someplace else.

private static void CropImages()
{
// Get all the files from the source directory

DirectoryInfo di = new DirectoryInfo(i nputDirName);
FileInfo[] imageFileNames = di.GetFiles();

// Process each file, one by one
foreach (FileInfo fi in imageFileNames) {

// If this is not an image file, skip it
if (!IsImageFile(f i.FullName)) {
continue;
}

// Take a piece of the orginal image and write it to
the
// cropped image.

Image imgOriginal; // Image read from disk
Bitmap imgCropped; // Image created from original
Rectangle rOriginal; // Source rectangle of
original
Rectangle rCropped; // Destination (cropped)
rectangle
Graphics g; // Graphics surface of
destination image
string outFileName; // Name of cropped image file
written out

try {
// Load the original image
imgOriginal = Image.FromFile( fi.FullName);

// Calculate the cropped image dimensions and
create a surface
// on which to draw it
imgCropped = new Bitmap(imgOrigi nal.Width,
imgOriginal.Hei ght - 18);
g = Graphics.FromIm age(imgCropped) ;
rOriginal = new Rectangle(0, 0, imgCropped.Widt h,
imgCropped.Heig ht);
rCropped = rOriginal;

// Copy the subset of the original image to the
cropped image
g.DrawImage(img Original, rCropped, rOriginal,
GraphicsUnit.Pi xel);

// Save the cropped image to disk
outFileName = outputDirName + @"\" +
Path.GetFileNam eWithoutExtensi on(fi.Name) + "_cropped.j pg";
imgCropped.Save (outFileName,
System.Drawing. Imaging.ImageFo rmat.Jpeg);

// Clean up resources
g.Dispose();
imgCropped.Disp ose();
imgOriginal.Dis pose();
}
catch (IOException ex) {
}
}
}

private static bool IsImageFile(str ing fileName)
{
return fileName.EndsWi th(".jpg") ||
fileName.EndsWi th(".gif") ||
fileName.EndsWi th(".bmp");
}

[sloan]

Bookmark this site:
http://www.bobpowell.net/faqmain.htm

He is daBomb for image related stuff.


"jpuopolo" <pu*****@gmail. comwrote in message
news:11******** *************@5 0g2000hsm.googl egroups.com...

All:

I looked around and could not find a simple yet complete example of
cropping an image in C#. I had the problem of needing to shave off the
bottom-most 18 lines of a directory full of images. The following code
does this. I hope that this serves as a concise yet complete example
of how to tackle cropping an image.

---
Note that inputDireName and outputDirName have been set in the class
someplace else.

private static void CropImages()
{
// Get all the files from the source directory

DirectoryInfo di = new DirectoryInfo(i nputDirName);
FileInfo[] imageFileNames = di.GetFiles();

// Process each file, one by one
foreach (FileInfo fi in imageFileNames) {

// If this is not an image file, skip it
if (!IsImageFile(f i.FullName)) {
continue;
}

// Take a piece of the orginal image and write it to
the
// cropped image.

Image imgOriginal; // Image read from disk
Bitmap imgCropped; // Image created from original
Rectangle rOriginal; // Source rectangle of
original
Rectangle rCropped; // Destination (cropped)
rectangle
Graphics g; // Graphics surface of
destination image
string outFileName; // Name of cropped image file
written out

try {
// Load the original image
imgOriginal = Image.FromFile( fi.FullName);

// Calculate the cropped image dimensions and
create a surface
// on which to draw it
imgCropped = new Bitmap(imgOrigi nal.Width,
imgOriginal.Hei ght - 18);
g = Graphics.FromIm age(imgCropped) ;
rOriginal = new Rectangle(0, 0, imgCropped.Widt h,
imgCropped.Heig ht);
rCropped = rOriginal;

// Copy the subset of the original image to the
cropped image
g.DrawImage(img Original, rCropped, rOriginal,
GraphicsUnit.Pi xel);

// Save the cropped image to disk
outFileName = outputDirName + @"\" +
Path.GetFileNam eWithoutExtensi on(fi.Name) + "_cropped.j pg";
imgCropped.Save (outFileName,
System.Drawing. Imaging.ImageFo rmat.Jpeg);

// Clean up resources
g.Dispose();
imgCropped.Disp ose();
imgOriginal.Dis pose();
}
catch (IOException ex) {
}
}
}

private static bool IsImageFile(str ing fileName)
{
return fileName.EndsWi th(".jpg") ||
fileName.EndsWi th(".gif") ||
fileName.EndsWi th(".bmp");
}